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Recent Advances in Nanomaterials for Water Treatment
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Recent Advances in Nanomaterials for Water Treatment

A special issue of Water (ISSN 2073-4441). This special issue belongs to the section "Wastewater Treatment and Reuse".

Deadline for manuscript submissions: closed (20 April 2023) | Viewed by 9355

Special Issue Editors

Dr. Shahid Iqbal

E-Mail Website
Guest Editor
School of Natural Sciences, National University of Sciences and Technology Pakistan, Islamabad, Pakistan
Interests: wastewater treatment; photocatalysis; nanocomposites; adsorption mechanisms; heavy metals; water splitting; hybrid materials
Dr. Ali Bahadur

E-Mail Website
Guest Editor
Department of Chemistry, College of Science and Technology Wenzhou-Kean University, Wenzhou, China
Interests: Li-ion battery; electrocatalysis; photocatalysis; water splitting; solar cell; microwave absorber; magnetic/dielectric material

Special Issue Information

Dear Colleagues,

Creating unique approaches towards quality improvement or toxicity degradation has become increasingly urgent as a result of people's growing knowledge of environmental safety and health hazards associated with drinking water for personal, domestic, or industrial use. New treatment methods for the effective capture of pollutants may be designed using recent developments in the synthesis and property tuning of nanomaterials. Nanomaterials' large surface area and chemical activity are essential for their incorporation into water treatment procedures, particularly where direct adsorption mechanisms or photocatalytic assistance are primary goals. However, for these applications to be viable, nanomaterials must be made in large numbers and their price should be competitively maintained relative to other conventional technologies. Combining low-cost nanomaterial production with excellent selectivity and efficiency in the removal of pollution has become a focus of attention and study in this field.

As part of the present Special Issue, we request high-caliber research articles on the synthesis of nanomaterials, surface modification, and improved characterisation for water treatment processes, including disinfection, photocatalysis, coagulation, or forward osmosis.

Dr. Shahid Iqbal
Dr. Ali Bahadur
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Water is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • nanomaterials
  • wastewater treatment
  • nanosheets/2D materials
  • composites
  • photocatalysis
  • water splitting
  • organic pollutants removal
  • dyes degradation
  • adsorption
  • heavy metals removal
  • leaching
  • functional materials
  • hybrid/heterojunction materials

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Further information on MDPI's Special Issue polices can be found here.

Published Papers (3 papers)

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Research

18 pages, 8076 KiB  
Article
Taguchi L9 (34) Orthogonal Array Design for Photocatalytic Degradation of Methylene Blue Dye by Green ZnO Particles Biosynthesized by Chrysanthemum spp. Flower Extract
by Thuan Van Tran, Mabkhoot Alsaiari, Farid A. Harraz, Walid Nabgan, Dinh Tien Dung Nguyen and Chi Van Nguyen
Water 2023, 15(12), 2186; https://doi.org/10.3390/w15122186 - 9 Jun 2023
Cited by 3 | Viewed by 2102
Abstract
The pollution of synthetic dyes in wastewater exerts many negative impacts on the environment and human health. There is an increasing demand for the degradation of dyes, with an emphasis on photocatalysis. Here, we investigated the bio-mediated synthesis of ZnO using Chrysanthemum spp. [...] Read more.
The pollution of synthetic dyes in wastewater exerts many negative impacts on the environment and human health. There is an increasing demand for the degradation of dyes, with an emphasis on photocatalysis. Here, we investigated the bio-mediated synthesis of ZnO using Chrysanthemum spp. flower extract and its utilization for the removal of methylene blue dye under sunlight irradiation. The bandgap energy of green ZnO nanoparticles was determined to be 3.0. The Taguchi L9 (34) orthogonal array design was applied to optimize the photocatalytic degradation of methylene blue dye by green ZnO particles. Four parameters, including the initial concentration (10–50 mg/L), ZnO dosage (0.33–1.0 mg), contact time (30–120 min), and pH (4–10) of the solution, were surveyed based on the Taguchi design. We found that the test result (99.0%) at 10 mg/L was almost equivalent to the predicted value (99.5%) of degradation efficiency. The reaction mechanisms shed light on the major role of reactive oxygen species (•O2−, •OH). More importantly, the green ZnO particles could be reused for at least five cycles and demonstrated high stability. Full article
(This article belongs to the Special Issue Recent Advances in Nanomaterials for Water Treatment)
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22 pages, 8656 KiB  
Article
TiO2/Activated Carbon/2D Selenides Composite Photocatalysts for Industrial Wastewater Treatment
by Shehzad Ahmad, Muhammad Suleman Tahir, Ghulam Mustafa Kamal, Xu Zhang, Saima Nazir, Muhammad Bilal Tahir, Bin Jiang and Muhammad Safdar
Water 2023, 15(9), 1788; https://doi.org/10.3390/w15091788 - 6 May 2023
Cited by 4 | Viewed by 3467
Abstract
Even in the 21st century, water contamination has been a big problem and industrial processes are to be blamed for polluted water supplies. The use of sunlight in the process of photocatalysis is an efficient way to purify wastewater. Composites of TiO2 [...] Read more.
Even in the 21st century, water contamination has been a big problem and industrial processes are to be blamed for polluted water supplies. The use of sunlight in the process of photocatalysis is an efficient way to purify wastewater. Composites of TiO2/activated carbon/two-dimensional selenides performed better than either of the individual material or binary composites for this application. A straightforward hydrothermal technique was employed in the synthesis of photocatalysts. The synthesized photocatalytic composites were verified with the help of UV-Visible spectroscopy, FTIR, XRD, and SEM. The heterostructures absorbed nearly all of the sun’s UV and visible light. These photons are then converted into usable reducing electrons and oxidizing species such as •O2 and OH• to decompose organic pollutants from industrial wastewater. Since there were additional pathways available for charge transfer along with several active edge sites, the composite photocatalysts are proven more active than individual TiO2 and 2D MoSe2 components. With the help of a cascade-driven mechanism of electrons, these channels can transmit more charges than single-component heterojunctions. The results provided a realistic method for developing photocatalyst composites powered by solar light for use in industrial wastewater treatment. Results of degradation of methylene blue suggest that the synthesized composites possess better photocatalytic activity. This enhanced photocatalytic activity is not limited to organic dyes. Other hazardous organic pollutants present in industrial wastewater can be decomposed by using this approach. Full article
(This article belongs to the Special Issue Recent Advances in Nanomaterials for Water Treatment)
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32 pages, 10774 KiB  
Article
Impregnation of Modified Magnetic Nanoparticles on Low-Cost Agro-Waste-Derived Biochar for Enhanced Removal of Pharmaceutically Active Compounds: Performance Evaluation and Optimization Using Response Surface Methodology
by Arif Jamal Siddiqui, Nisha Kumari, Mohd Adnan, Sanjeev Kumar, Abdelmushin Abdelgadir, Juhi Saxena, Riadh Badraoui, Mejdi Snoussi, Puja Khare and Ritu Singh
Water 2023, 15(9), 1688; https://doi.org/10.3390/w15091688 - 26 Apr 2023
Cited by 8 | Viewed by 3249
Abstract
In the present study, a magnetic nanocomposite based on biochar (BC) derived from sugarcane bagasse, nanoscale zerovalent iron (nZVI), and chitosan (CS) was fabricated to investigate its efficacy for the removal of two widely used pharmaceutically active compounds (PhACs), namely aspirin (ASA) and [...] Read more.
In the present study, a magnetic nanocomposite based on biochar (BC) derived from sugarcane bagasse, nanoscale zerovalent iron (nZVI), and chitosan (CS) was fabricated to investigate its efficacy for the removal of two widely used pharmaceutically active compounds (PhACs), namely aspirin (ASA) and carbamazepine (CBZ). The synthesized nanocomposite (BC-CS@nZVI) was characterized using XRD, FTIR, and FESEM-EDX. The Response Surface Methodology–Central Composite Design (RSM-CCD) model was used for the optimization of removal efficacies for both drugs using five variables, i.e., adsorbent dose (0.05–0.1 g), pH (2–10), drug concentration (20–40 ppm), time (40–80 min), and temperature (40–60 °C). Under optimized conditions of adsorbent dose: 0.075 g, pH: 2, drug concentration: 30 ppm, time: 60 min, and temperature: 50 °C, the maximum removal efficiency of ASA drug was observed to be 97.8%, while in the case of CBZ drug under similar conditions with pH 6, the maximum removal was found up to 89.32%. The isotherm models revealed that both ASA and CBZ adsorption data fit well with the Langmuir isotherm showing monolayer adsorption. The kinetics of adsorption was well explained by the pseudo-first- and pseudo-second-order models in the case of ASA and CBZ, respectively. Thermodynamic parameters confirmed the feasibility of the reaction and its spontaneous and exothermic nature. The reusability and efficiency in water samples of the Ha’il region were investigated to demonstrate its potential for practical application. Full article
(This article belongs to the Special Issue Recent Advances in Nanomaterials for Water Treatment)
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