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New Insights into Novel Catalysts for Treatment of Pollutants in...
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New Insights into Novel Catalysts for Treatment of Pollutants in Wastewater

A special issue of Catalysts (ISSN 2073-4344). This special issue belongs to the section "Environmental Catalysis".

Deadline for manuscript submissions: closed (30 December 2022) | Viewed by 32043

Printed Edition Available!
A printed edition of this Special Issue is available here.

Special Issue Editors

Prof. Dr. Hao Xu

E-Mail Website
Guest Editor
Department of Environmental Science and Engineering, School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China
Interests: electrocatalytic oxidation; electrochemical scale removal; electrochemical sterilization; metal oxide electrode
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Yanbiao Liu

E-Mail Website
Co-Guest Editor
College of Environmental Science and Engineering, Donghua University, Shanghai 201620, China
Interests: environmental nanotechnology; electrochemistry; advanced oxidation technology
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Water scarcity has become a worldwide problem. Wastewater treatment and reuse is an effective way to expand water resources, among which the treatment method of using catalysts as media is unique. Obviously, the catalyst is the core of these treatment methods, and its properties directly determine the treatment's effect and cost. In recent years, with the development of science and technology, various new catalysts have emerged in an endless stream, and related fields have become the focus of current scientific research. To this end, we are organizing a Special Issue of our journal, focusing on the preparation, modification, and application of novel catalysts for wastewater catalytic treatment. Areas from which contributions can be made include:

  • Catalysts for electrocatalytic oxidation.
  • Catalysts for photocatalytic oxidation.
  • Catalysts for photo-electrocatalytic oxidation.
  • Catalysts for microbial electrochemical treatment.
  • Catalysts for Fenton/sub-Fenton catalytic oxidation.
  • Other catalysts that can be used for the catalytic oxidation of water treatment.
  • The application of new catalysts in wastewater treatment.

For more information on "New Insights into Novel Catalysts for Treatment of Pollutants in Wastewater", please go to: https://www.mdpi.com/journal/catalysts/special_issues/catalysts_pollutants_treament_wastewater.

Dr. Hao Xu
Prof. Dr. Yanbiao Liu
Guest Editors

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Keywords

  • catalysts for electrocatalytic oxidation
  • catalysts for photocatalytic oxidation
  • catalysts for photo-electrocatalytic oxidation
  • catalysts for microbial electrochemical treatment
  • catalysts for fenton/sub-fenton catalytic oxidation
  • other catalysts that can be used for the catalytic oxidation of water treatment
  • the application of new catalysts in wastewater treatment

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Published Papers (14 papers)

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Editorial

Jump to: Research, Review

6 pages, 202 KiB  
Editorial
New Insights into Novel Catalysts for Treatment of Pollutants in Wastewater
by Hao Xu and Yanbiao Liu
Catalysts 2023, 13(5), 840; https://doi.org/10.3390/catal13050840 - 5 May 2023
Viewed by 1479
Abstract
Water scarcity has become a worldwide problem [...] Full article
(This article belongs to the Special Issue New Insights into Novel Catalysts for Treatment of Pollutants in Wastewater)

Research

Jump to: Editorial, Review

13 pages, 4826 KiB  
Article
Modification of Ti/Sb-SnO2/PbO2 Electrode by Active Granules and Its Application in Wastewater Containing Copper Ions
by Xuanqi Kang, Jia Wu, Zhen Wei, Bo Jia, Qing Feng, Shangyuan Xu and Yunhai Wang
Catalysts 2023, 13(3), 515; https://doi.org/10.3390/catal13030515 - 3 Mar 2023
Cited by 3 | Viewed by 1702
Abstract
Active granule (WC/Co3O4) doping Ti/Sb-SnO2/PbO2 electrodes were successfully synthesized by composite electrodeposition. The as-prepared electrodes were systematically characterized by scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), electrochemical performance, [...] Read more.
Active granule (WC/Co3O4) doping Ti/Sb-SnO2/PbO2 electrodes were successfully synthesized by composite electrodeposition. The as-prepared electrodes were systematically characterized by scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), electrochemical performance, zeta potential, and accelerated lifetime. It was found that the doping of active granules (WC/Co3O4) can reduce the average grain size and increase the number of active sites on the electrode surface. Moreover, it can improve the proportion of surface oxygen vacancies and non-stoichiometric PbO2, resulting in an outstanding conductivity, which can improve the electron transfer and catalytic activity of the electrode. Electrochemical measurements imply that Ti/Sb-SnO2/Co3O4-PbO2 and Ti/Sb-SnO2/WC-Co3O4-PbO2 electrodes have superior oxygen evolution reactions (OERs) relative to those of Ti/Sb-SnO2/PbO2 and Ti/Sb-SnO2/WC-PbO2 electrodes. A Ti/Sb-SnO2/Co3O4-PbO2 electrode is considered as the optimal modified electrode due to its long lifetime (684 h) and the remarkable stability of plating solutions. The treatment of copper wastewater suggests that composite electrodes exhibit low cell voltage and excellent extraction efficiency. Furthermore, pilot simulation tests verified that a composite electrode consumes less energy than other electrodes. Therefore, it is inferred that composite electrodes may be promising for the treatment of wastewater containing high concentrations of copper ions. Full article
(This article belongs to the Special Issue New Insights into Novel Catalysts for Treatment of Pollutants in Wastewater)
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12 pages, 2400 KiB  
Article
Removal Efficiency and Performance Optimization of Organic Pollutants in Wastewater Using New Biochar Composites
by Guodong Wang, Shirong Zong, Hang Ma, Banglong Wan and Qiang Tian
Catalysts 2023, 13(1), 184; https://doi.org/10.3390/catal13010184 - 13 Jan 2023
Cited by 3 | Viewed by 1935
Abstract
The purpose is to optimize the catalytic performance of biochar (BC), improve the removal effect of BC composites on organic pollutants in wastewater, and promote the recycling and sustainable utilization of water resources. Firstly, the various characteristics and preparation principles of new BC [...] Read more.
The purpose is to optimize the catalytic performance of biochar (BC), improve the removal effect of BC composites on organic pollutants in wastewater, and promote the recycling and sustainable utilization of water resources. Firstly, the various characteristics and preparation principles of new BC are discussed. Secondly, the types of organic pollutants in wastewater and their removal principles are discussed. Finally, based on the principle of removing organic pollutants, BC/zero valent iron (BC/ZVI) composite is designed, among which BC is mainly used for catalysis. The effect of BC/ZVI in removing tetracycline (TC) is comprehensively evaluated. The research results reveal that the TC removal effect of pure BC is not ideal, and that of ZVI is general. The BC/ZVI composite prepared by combining the two has a better removal effect on TC, with a removal amount of about 275 mg/g. Different TC concentrations, ethylene diamine tetraacetic acid (EDTA), pH environment, tert-butanol, and calcium ions will affect the TC removal effect of BC composites. The overall effect is the improvement of the TC removal amount of BC composites. It reveals that BC has a very suitable catalytic effect on ZVI, and the performance of BC composite material integrating BC catalyst and ZVI has been effectively improved, which can play a very suitable role in wastewater treatment. This exploration provides a technical reference for the effective removal of organic pollutants in wastewater and contributes to the development of water resource recycling. Full article
(This article belongs to the Special Issue New Insights into Novel Catalysts for Treatment of Pollutants in Wastewater)
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12 pages, 3725 KiB  
Article
New Magnetically Assembled Electrode Consisting of Magnetic Activated Carbon Particles and Ti/Sb-SnO2 for a More Flexible and Cost-Effective Electrochemical Oxidation Wastewater Treatment
by Fanxi Zhang, Dan Shao, Changan Yang, Hao Xu, Jin Yang, Lei Feng, Sizhe Wang, Yong Li, Xiaohua Jia and Haojie Song
Catalysts 2023, 13(1), 7; https://doi.org/10.3390/catal13010007 - 22 Dec 2022
Cited by 5 | Viewed by 2059
Abstract
Magnetic activated carbon particles (Fe3O4/active carbon composites) as auxiliary electrodes (AEs) were fixed on the surface of Ti/Sb-SnO2 foil by a NdFeB magnet to form a new magnetically assembled electrode (MAE). Characterizations including cyclic voltammetry, Tafel analysis, and [...] Read more.
Magnetic activated carbon particles (Fe3O4/active carbon composites) as auxiliary electrodes (AEs) were fixed on the surface of Ti/Sb-SnO2 foil by a NdFeB magnet to form a new magnetically assembled electrode (MAE). Characterizations including cyclic voltammetry, Tafel analysis, and electrochemical impedance spectroscopy were carried out. The electrochemical oxidation performances of the new MAE towards different simulated wastewaters (azo dye acid red G, phenol, and lignosulfonate) were also studied. Series of the electrochemical properties of MAE were found to be varied with the loading amounts of AEs. The electrochemical area as well as the number of active sites increased significantly with the AEs loading, and the charge transfer was also facilitated by these AEs. Target pollutants’ removal of all simulated wastewaters were found to be enhanced when loading appropriate amounts of AEs. The accumulation of intermediate products was also determined by the AEs loading amount. This new MAE may provide a landscape of a more cost-effective and flexible electrochemical oxidation wastewater treatment (EOWT). Full article
(This article belongs to the Special Issue New Insights into Novel Catalysts for Treatment of Pollutants in Wastewater)
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13 pages, 4767 KiB  
Article
Catalytic Ozonation of Norfloxacin Using Co-Mn/CeO2 as a Multi-Component Composite Catalyst
by Ruicheng Li, Jianhua Xiong, Yuanyuan Zhang, Shuangfei Wang, Hongxiang Zhu and Lihai Lu
Catalysts 2022, 12(12), 1606; https://doi.org/10.3390/catal12121606 - 8 Dec 2022
Cited by 3 | Viewed by 1648
Abstract
In this study, a Co-Mn/CeO2 composite was prepared through a facile sol-gel method and used as an efficient catalyst for the ozonation of norfloxacin (NOR). The Co-Mn/CeO2 composite was characterized via XRD, SEM, BET and XPS analysis. The catalytic ozonation of [...] Read more.
In this study, a Co-Mn/CeO2 composite was prepared through a facile sol-gel method and used as an efficient catalyst for the ozonation of norfloxacin (NOR). The Co-Mn/CeO2 composite was characterized via XRD, SEM, BET and XPS analysis. The catalytic ozonation of NOR by Co-Mn/CeO2 under different conditions was systematically investigated, including the effect of the initial solution’s pH, Co-Mn/CeO2 composite dose, O3 dose and NOR concentration on degradation kinetics. Only about 3.33% of total organic carbon (TOC) and 72.17% of NOR could be removed within 150 min by single ozonation under the conditions of 60 mg/L of NOR and 200 mL/min of O3 at pH= 7 and room temperature, whereas in the presence of 0.60 g/L of the Co-Mn/CeO2 composite under the same conditions, 87.24% NOR removal was obtained through the catalytic ozonation process. The results showed that catalytic ozonation with the Co-Mn/CeO2 composite could effectively enhance the degradation and mineralization of NOR compared to a single ozonation system alone. The catalytic performance of CeO2 was significantly improved by the modification with Mn and Co. Co-Mn/CeO2 represents a promising way to prepare efficient catalysts for the catalytic ozonation of organic polluted water. The removal efficiency of NOR in five cycles indicates that Co-Mn/CeO2 is stable and recyclable for catalytic ozonation in water treatment. Full article
(This article belongs to the Special Issue New Insights into Novel Catalysts for Treatment of Pollutants in Wastewater)
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12 pages, 2602 KiB  
Article
N Doped Activated Biochar from Pyrolyzing Wood Powder for Prompt BPA Removal via Peroxymonosulfate Activation
by Haiqin Lu, Guilu Xu and Lu Gan
Catalysts 2022, 12(11), 1449; https://doi.org/10.3390/catal12111449 - 16 Nov 2022
Cited by 10 | Viewed by 1913
Abstract
In the present study, nitrogen doped biochar (N-PPB) and nitrogen doped activated biochar (AN-PPB) were prepared and used for removing bisphenol A (BPA) in water through activating peroxymonosulfate. It was found from the results that N-PPB exhibited superior catalytic performance over pristine biochar [...] Read more.
In the present study, nitrogen doped biochar (N-PPB) and nitrogen doped activated biochar (AN-PPB) were prepared and used for removing bisphenol A (BPA) in water through activating peroxymonosulfate. It was found from the results that N-PPB exhibited superior catalytic performance over pristine biochar since nitrogen could brought about abundant active sites to the biochar structure. The non-radical singlet oxygen (1O2) was determined to be the dominant active species responsible for BPA degradation. Having non-radical pathway in the N-PPB/PMS system, the BPA degradation was barely influenced by many external environmental factors including solution pH value, temperature, foreign organic, and inorganic matters. Furthermore, AN-PPB had richer porosity than N-PPB, which showed even faster BPA removal efficiency than N-PPB through an adsorptive/catalytic synergy. The finding of this study introduces a novel way of designing hieratical structured biochar catalysts for effective organic pollutant removal in water. Full article
(This article belongs to the Special Issue New Insights into Novel Catalysts for Treatment of Pollutants in Wastewater)
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18 pages, 4416 KiB  
Article
Kinetics and Mechanisms of Cr(VI) Removal by nZVI: Influencing Parameters and Modification
by Yizan Gao, Xiaodan Yang, Xinwei Lu, Minrui Li, Lijun Wang and Yuru Wang
Catalysts 2022, 12(9), 999; https://doi.org/10.3390/catal12090999 - 5 Sep 2022
Cited by 14 | Viewed by 2343
Abstract
In this study, single-spherical nanoscale zero valent iron (nZVI) particles with large specific sur-face area were successfully synthesized by a simple and rapid chemical reduction method. The XRD spectra and SEM–EDS images showed that the synthesized nZVI had excellent crystal struc-ture, but oxidation [...] Read more.
In this study, single-spherical nanoscale zero valent iron (nZVI) particles with large specific sur-face area were successfully synthesized by a simple and rapid chemical reduction method. The XRD spectra and SEM–EDS images showed that the synthesized nZVI had excellent crystal struc-ture, but oxidation products, such as γ-Fe2O3 and Fe3O4, were formed on the surface of the parti-cles. The effect of different factors on the removal of Cr(VI) by nZVI were studied, and the opti-mum experimental conditions were found. Kinetic and thermodynamic equations at different temperatures showed that the removal of Cr(VI) by nZVI was a single-layer chemical adsorption, conforming to pseudo-second-order kinetics. By applying the intraparticle diffusion model, the ad-sorption process was composed of three stages, namely rapid diffusion, chemical reduction, and in-ternal saturation. Mechanism analysis demonstrated that the removal of Cr(VI) by nZVI in-volved adsorption, reduction, precipitation and coprecipitation. Meanwhile, Cr(VI) was reduced to Cr(III) by nZVI, while FeCr2O4, CrxFe1−xOOH, and CrxFe1−x(OH)3 were formed as end products. In addition, the study found that ascorbic acid, starch, and Cu modified nZVI can promote the removal efficiency of Cr(VI) in varying degrees due to the enhanced mobility of the particles. These results can provide new insights into the removal mechanisms of Cr(VI) by nZVI. Full article
(This article belongs to the Special Issue New Insights into Novel Catalysts for Treatment of Pollutants in Wastewater)
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13 pages, 2595 KiB  
Article
Facile Synthesis and Environmental Applications of Noble Metal-Based Catalytic Membrane Reactors
by Haochen Yan, Fuqiang Liu, Jinna Zhang and Yanbiao Liu
Catalysts 2022, 12(8), 861; https://doi.org/10.3390/catal12080861 - 5 Aug 2022
Cited by 2 | Viewed by 2349
Abstract
Noble metal nanoparticle-loaded catalytic membrane reactors (CMRs) have emerged as a promising method for water decontamination. In this study, we proposed a convenient and green strategy to prepare gold nanoparticle (Au NPs)-loaded CMRs. First, the redox-active substrate membrane (CNT-MoS2) composed of [...] Read more.
Noble metal nanoparticle-loaded catalytic membrane reactors (CMRs) have emerged as a promising method for water decontamination. In this study, we proposed a convenient and green strategy to prepare gold nanoparticle (Au NPs)-loaded CMRs. First, the redox-active substrate membrane (CNT-MoS2) composed of carbon nanotube (CNT) and molybdenum disulfide (MoS2) was prepared by an impregnation method. Water-diluted Au(III) precursor (HAuCl4) was then spontaneously adsorbed on the CNT-MoS2 membrane only through filtration and reduced into Au(0) nanoparticles in situ, which involved a “adsorption–reduction” process between Au(III) and MoS2. The constructed CNT-MoS2@Au membrane demonstrated excellent catalytic activity and stability, where a complete 4-nitrophenol transformation can be obtained within a hydraulic residence time of <3.0 s. In addition, thanks to the electroactivity of CNT networks, the as-designed CMR could also be applied to the electrocatalytic reduction of bromate (>90%) at an applied voltage of −1 V. More importantly, by changing the precursors, one could further obtain the other noble metal-based CMR (e.g., CNT-MoS2@Pd) with superior (electro)catalytic activity. This study provided new insights for the rational design of high-performance CMRs toward various environmental applications. Full article
(This article belongs to the Special Issue New Insights into Novel Catalysts for Treatment of Pollutants in Wastewater)
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14 pages, 8197 KiB  
Article
Performance Optimization and Toxicity Effects of the Electrochemical Oxidation of Octogen
by Yishi Qian, Kai Chen, Guodong Chai, Peng Xi, Heyun Yang, Lin Xie, Lu Qin, Yishan Lin, Xiaoliang Li, Wei Yan and Dongqi Wang
Catalysts 2022, 12(8), 815; https://doi.org/10.3390/catal12080815 - 25 Jul 2022
Cited by 2 | Viewed by 1787
Abstract
Octogen (HMX) is widely used as a high explosive and constituent in plastic explosives, nuclear devices, and rocket fuel. The direct discharge of wastewater generated during HMX production threatens the environment. In this study, we used the electrochemical oxidation (EO) method with a [...] Read more.
Octogen (HMX) is widely used as a high explosive and constituent in plastic explosives, nuclear devices, and rocket fuel. The direct discharge of wastewater generated during HMX production threatens the environment. In this study, we used the electrochemical oxidation (EO) method with a PbO2-based anode to treat HMX wastewater and investigated its degradation performance, mechanism, and toxicity evolution under different conditions. The results showed that HMX treated by EO could achieve a removal efficiency of 81.2% within 180 min at a current density of 70 mA/cm2, Na2SO4 concentration of 0.25 mol/L, interelectrode distance of 1.0 cm, and pH of 5.0. The degradation followed pseudo-first-order kinetics (R2 > 0.93). The degradation pathways of HMX in the EO system have been proposed, including cathode reduction and indirect oxidation by •OH radicals. The molecular toxicity level (expressed as the transcriptional effect level index) of HMX wastewater first increased to 1.81 and then decreased to a non-toxic level during the degradation process. Protein and oxidative stress were the dominant stress categories, possibly because of the intermediates that evolved during HMX degradation. This study provides new insights into the electrochemical degradation mechanisms and molecular-level toxicity evolution during HMX degradation. It also serves as initial evidence for the potential of the EO-enabled method as an alternative for explosive wastewater treatment with high removal performance, low cost, and low environmental impact. Full article
(This article belongs to the Special Issue New Insights into Novel Catalysts for Treatment of Pollutants in Wastewater)
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15 pages, 4102 KiB  
Article
Degradation of Tetracycline Hydrochloride by a Novel CDs/g-C3N4/BiPO4 under Visible-Light Irradiation: Reactivity and Mechanism
by Wei Qian, Wangtong Hu, Zhifei Jiang, Yongyi Wu, Zihuan Li, Zenghui Diao and Mingyu Li
Catalysts 2022, 12(7), 774; https://doi.org/10.3390/catal12070774 - 13 Jul 2022
Cited by 10 | Viewed by 2193
Abstract
In recent years, with the large-scale use of antibiotics, the pollution of antibiotics in the environment has become increasingly serious and has attracted widespread attention. In this study, a novel CDs/g-C3N4/BiPO4 (CDBPC) composite was successfully synthesized by a [...] Read more.
In recent years, with the large-scale use of antibiotics, the pollution of antibiotics in the environment has become increasingly serious and has attracted widespread attention. In this study, a novel CDs/g-C3N4/BiPO4 (CDBPC) composite was successfully synthesized by a hydrothermal method for the removal of the antibiotic tetracycline hydrochloride (TC) in water. The experimental results showed that the synthesized photocatalyst was crystalline rods and cotton balls, accompanied by overlapping layered nanosheet structures, and the specific surface area was as high as 518.50 m2/g. This photocatalyst contains g-C3N4 and bismuth phosphate (BiPO4) phases, as well as abundant surface functional groups such as C=N, C-O, and P-O. When the optimal conditions were pH 4, CDBPC dosage of 1 g/L, and TC concentration of 10 mg/L, the degradation rate of TC reached 75.50%. Active species capture experiments showed that the main active species in this photocatalytic system were holes (h+), hydroxyl radicals, and superoxide anion radicals. The reaction mechanism for the removal of TC by CDBPC was also proposed. The removal of TC was mainly achieved by the synergy between the adsorption of CDBPC and the oxidation of both holes and hydroxyl radicals. In this system, TC was adsorbed on the surface of CDBPC, and then the adsorbed TC was degraded into small molecular products by an attack with holes and hydroxyl radicals and finally mineralized into carbon dioxide and water. This study indicated that this novel photocatalyst CDBPC has a huge potential for antibiotic removal, which provides a new strategy for antibiotic treatment of wastewater. Full article
(This article belongs to the Special Issue New Insights into Novel Catalysts for Treatment of Pollutants in Wastewater)
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14 pages, 3413 KiB  
Article
Evaluation of Fe2+/Peracetic Acid to Degrade Three Typical Refractory Pollutants of Textile Wastewater
by Jiali Yu, Shihu Shu, Qiongfang Wang, Naiyun Gao and Yanping Zhu
Catalysts 2022, 12(7), 684; https://doi.org/10.3390/catal12070684 - 22 Jun 2022
Cited by 5 | Viewed by 1907
Abstract
In this work, the degradation performance of Fe2+/PAA/H2O2 on three typical pollutants (reactive black 5, ANL, and PVA) in textile wastewater was investigated in comparison with Fe2+/H2O2. Therein, Fe2+/PAA/H2 [...] Read more.
In this work, the degradation performance of Fe2+/PAA/H2O2 on three typical pollutants (reactive black 5, ANL, and PVA) in textile wastewater was investigated in comparison with Fe2+/H2O2. Therein, Fe2+/PAA/H2O2 had a high removal on RB5 (99%) mainly owing to the contribution of peroxyl radicals and/or Fe(IV). Fe2+/H2O2 showed a relatively high removal on PVA (28%) mainly resulting from ·OH. Fe2+/PAA/H2O2 and Fe2+/H2O2 showed comparative removals on ANL. Additionally, Fe2+/PAA/H2O2 was more sensitive to pH than Fe2+/H2O2. The coexisting anions (20–2000 mg/L) showed inhibition on their removals and followed an order of HCO3− > SO42− > Cl−. Humic acid (5 and 10 mg C/L) posed notable inhibition on their removals following an order of reactive black 5 (RB5) > ANL > PVA. In practical wastewater effluent, PVA removal was dramatically inhibited by 88%. Bioluminescent bacteria test results suggested that the toxicity of Fe2+/PAA/H2O2 treated systems was lower than that of Fe2+/H2O2. RB5 degradation had three possible pathways with the proposed mechanisms of hydroxylation, dehydrogenation, and demethylation. The results may favor the performance evaluation of Fe2+/PAA/H2O2 in the advanced treatment of textile wastewater. Full article
(This article belongs to the Special Issue New Insights into Novel Catalysts for Treatment of Pollutants in Wastewater)
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20 pages, 4210 KiB  
Article
Degradation of Rhodamine B in Wastewater by Iron-Loaded Attapulgite Particle Heterogeneous Fenton Catalyst
by Peiguo Zhou, Zongbiao Dai, Tianyu Lu, Xin Ru, Meshack Appiah Ofori, Wenjing Yang, Jiaxin Hou and Hui Jin
Catalysts 2022, 12(6), 669; https://doi.org/10.3390/catal12060669 - 19 Jun 2022
Cited by 14 | Viewed by 2974
Abstract
The water pollution caused by industry emissions makes effluent treatment a serious matter that needs to be settled. Heterogeneous Fenton oxidation has been recognized as an effective means to degrade pollutants in water. Attapulgite can be used as a catalyst carrier because of [...] Read more.
The water pollution caused by industry emissions makes effluent treatment a serious matter that needs to be settled. Heterogeneous Fenton oxidation has been recognized as an effective means to degrade pollutants in water. Attapulgite can be used as a catalyst carrier because of its distinctive spatial crystal structure and surface ion exchange. In this study, iron ions were transported on attapulgite particles to generate an iron-supporting attapulgite particles catalyst. BET, EDS, SEM and XRD characterized the catalysts. The particle was used as a heterogeneous catalyst to degrade rhodamine B (RhB) dye in wastewater. The effects of H2O2 concentration, initial pH value, catalyst dosage and temperature on the degradation of dyes were studied. The results showed that the decolorization efficiency was consistently maintained after consecutive use of a granular catalyst five times, and the removal rate was more than 98%. The degradation and mineralization effect of cationic dyes by granular catalyst was better than that of anionic dyes. Hydroxyl radicals play a dominant role in RhB catalytic degradation. The dynamic change and mechanism of granular catalysts in catalytic degradation of RhB were analyzed. In this study, the application range of attapulgite was widened. The prepared granular catalyst was cheap, stable and efficient, and could be used to treat refractory organic wastewater. Full article
(This article belongs to the Special Issue New Insights into Novel Catalysts for Treatment of Pollutants in Wastewater)
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12 pages, 3649 KiB  
Article
Peroxymonosulfate Activation by Photoelectroactive Nanohybrid Filter towards Effective Micropollutant Decontamination
by Wenchang Zhao, Yuling Dai, Wentian Zheng and Yanbiao Liu
Catalysts 2022, 12(4), 416; https://doi.org/10.3390/catal12040416 - 7 Apr 2022
Cited by 2 | Viewed by 1791
Abstract
Herein, we report and demonstrate a photoelectrochemical filtration system that enables the effective decontamination of micropollutants from water. The key to this system was a photoelectric–active nanohybrid filter consisting of a carbon nanotube (CNT) and MIL–101(Fe). Various advanced characterization techniques were employed to [...] Read more.
Herein, we report and demonstrate a photoelectrochemical filtration system that enables the effective decontamination of micropollutants from water. The key to this system was a photoelectric–active nanohybrid filter consisting of a carbon nanotube (CNT) and MIL–101(Fe). Various advanced characterization techniques were employed to obtain detailed information on the microstructure, morphology, and defect states of the nanohybrid filter. The results suggest that both radical and nonradical pathways collectively contributed to the degradation of antibiotic tetracycline, a model refractory micropollutant. The underlying working mechanism was proposed based on solid experimental evidences. This study provides new insights into the effective removal of micropollutants from water by integrating state–of–the–art advanced oxidation and microfiltration techniques. Full article
(This article belongs to the Special Issue New Insights into Novel Catalysts for Treatment of Pollutants in Wastewater)
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Review

Jump to: Editorial, Research

22 pages, 2397 KiB  
Review
Progress in Preparation and Application of Titanium Sub-Oxides Electrode in Electrocatalytic Degradation for Wastewater Treatment
by Siyuan Guo, Zhicheng Xu, Wenyu Hu, Duowen Yang, Xue Wang, Hao Xu, Xing Xu, Zhi Long and Wei Yan
Catalysts 2022, 12(6), 618; https://doi.org/10.3390/catal12060618 - 6 Jun 2022
Cited by 25 | Viewed by 4452
Abstract
To achieve low-carbon and sustainable development it is imperative to explore water treatment technologies in a carbon-neutral model. Because of its advantages of high efficiency, low consumption, and no secondary pollution, electrocatalytic oxidation technology has attracted increasing attention in tackling the challenges of [...] Read more.
To achieve low-carbon and sustainable development it is imperative to explore water treatment technologies in a carbon-neutral model. Because of its advantages of high efficiency, low consumption, and no secondary pollution, electrocatalytic oxidation technology has attracted increasing attention in tackling the challenges of organic wastewater treatment. The performance of an electrocatalytic oxidation system depends mainly on the properties of electrodes materials. Compared with the instability of graphite electrodes, the high expenditure of noble metal electrodes and boron-doped diamond electrodes, and the hidden dangers of titanium-based metal oxide electrodes, a titanium sub-oxide material has been characterized as an ideal choice of anode material due to its unique crystal and electronic structure, including high conductivity, decent catalytic activity, intense physical and chemical stability, corrosion resistance, low cost, and long service life, etc. This paper systematically reviews the electrode preparation technology of Magnéli phase titanium sub-oxide and its research progress in the electrochemical advanced oxidation treatment of organic wastewater in recent years, with technical difficulties highlighted. Future research directions are further proposed in process optimization, material modification, and application expansion. It is worth noting that Magnéli phase titanium sub-oxides have played very important roles in organic degradation. There is no doubt that titanium sub-oxides will become indispensable materials in the future. Full article
(This article belongs to the Special Issue New Insights into Novel Catalysts for Treatment of Pollutants in Wastewater)
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