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Applied Chemistry in Asia

A special issue of Molecules (ISSN 1420-3049). This special issue belongs to the section "Applied Chemistry".

Deadline for manuscript submissions: 31 May 2025 | Viewed by 5418

Special Issue Editor

Prof. Dr. Shaojun Yuan

E-Mail Website
Guest Editor
Low-Carbon Technology & Chemical Reaction Engineering Laboratory, College of Chemical Engineering, Sichuan University, Chengdu 610065, China
Interests: nano environmental materials; adsorption; CO2 capture; supercapacitor; supwetting surfaces for oil/water separation
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The future of research in the applied chemistry field holds immense potential for exciting advancements and transformative impacts. This Special Issue is devoted to providing an overview of recent advancements in the field of applied chemistry in Asia, and research topics include, but are not limited to, the following:

  • Sustainable and green chemistry;
  • Advanced materials and applications;
  • Energy storage and conversion;
  • Drug discovery and delivery;
  • Solar energy usage and technology;
  • Molecular engineering and nanotechnology;
  • Low carbon and de-carbon technology;
  • Fine chemistry and chemicals;
  • Applied electrochemistry;
  • Membrane science and separation;
  • Data-driven approaches for applied chemistry.

Original research articles, review articles, and state-of-the-art communications are welcome.

Prof. Dr. Shaojun Yuan
Guest Editor

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. Molecules 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 2700 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

  • applied chemistry
  • new molecules and natural materials
  • solar energy and photo-electro-catalysis
  • analytical methods and techniques
  • electrochemistry and energy
  • biodegradable materials and medicines
  • environment and green chemistry

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Published Papers (7 papers)

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Research

13 pages, 2270 KiB  
Article
Dual-Mechanism Study of Metal-Free g-C3N4 Catalysts for Advanced Oxidation Under Non-Photocatalytic Conditions
by Zixu Yang, Yang Sun, Weizhi Wang, Xiaohan Yuan, Pengfei Tian and Jing Xu
Molecules 2025, 30(2), 247; https://doi.org/10.3390/molecules30020247 - 10 Jan 2025
Viewed by 424
Abstract
Metal-free materials have been proved to be promising replacements of traditional metal-based catalysts for advanced oxidation reactions. Carbon nitride was found to be able to activate H2O2 and generate hydroxyl radicals (•OH). Nevertheless, the performance of carbon nitride is highly [...] Read more.
Metal-free materials have been proved to be promising replacements of traditional metal-based catalysts for advanced oxidation reactions. Carbon nitride was found to be able to activate H2O2 and generate hydroxyl radicals (•OH). Nevertheless, the performance of carbon nitride is highly dependent on an external light source. In this work, we report a light-independent, metal-free catalyst based on g-C3N4 prepared using a facile calcination method. It is revealed that two reaction pathways, a radical (•OH) one and a nonradical (H2O2) one, coexist in organics oxidation on g-C3N4. The dominant reaction pathway is dependent on the condensation temperature of UCN. In addition, this g-C3N4 exhibited excellent stability after being recycled and reused for five cycles. The findings in this work can be used for the design of efficient and robust metal-free catalysts with both superior catalytic performance and high stability for various heterogeneous catalytic processes. Full article
(This article belongs to the Special Issue Applied Chemistry in Asia)
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13 pages, 4141 KiB  
Article
Electrochemical Sensor Based on Co-MOF for the Detection of Dihydromyricetin in Ampelopsis grossedentata
by Xiaojing Si, Yue Huang, Mei Han and Liqiang Luo
Molecules 2025, 30(1), 180; https://doi.org/10.3390/molecules30010180 - 5 Jan 2025
Viewed by 575
Abstract
Dihydromyricetin (DMY), as the main active ingredient in Ampelopsis grossedentata, is a naturally occurring flavonoid that has attracted extensive attention for its multiple biological activities. For the quick and accurate measurement of DMY, a novel electrochemical sensor based on a glassy carbon [...] Read more.
Dihydromyricetin (DMY), as the main active ingredient in Ampelopsis grossedentata, is a naturally occurring flavonoid that has attracted extensive attention for its multiple biological activities. For the quick and accurate measurement of DMY, a novel electrochemical sensor based on a glassy carbon electrode (GCE) modified with a cobalt metal-organic framework (Co-MOF) was proposed in this work. The Co-MOF was synthesized via a single-step hydrothermal process using Co(NO3)2·6H2O. Fourier infrared spectroscopy, X-ray photoelectron spectroscopy and scanning electron microscopy were used to study the morphology and structure of the synthesized Co-MOF. Utilizing differential pulse voltammetry and cyclic voltammetry methods, the effectiveness of DMY electro-oxidation on the Co-MOF/GCE was examined. The results showed that, in comparison to the bare GCE, the electro-oxidation peak current of DMY was considerably increased by the Co-MOF/GCE. The detection limit was 0.07 μM, and the peak current demonstrated two linear relationships in the ranges of 0.2−20 μM and 20−100 μM, with the linear equations of Ip (μA) = 0.4729c (μM) + 1.0822 (R2 = 0.9913) and Ip (μA) = 0.0939c (μM) + 8.4178 (R2 = 0.9971), respectively. The average DMY content in Ampelopsis grossedentata samples was measured to be 3.275 μM, with a good recovery of 108.27% and a relative standard deviation value of 3.46%. The proposed method is simple, rapid and sensitive and can be used for the determination of DMY in Ampelopsis grossedentata. Full article
(This article belongs to the Special Issue Applied Chemistry in Asia)
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16 pages, 4834 KiB  
Article
Performance Evaluation of Enhanced Oil Recovery by Host–Guest Interaction of β-Cyclodextrin Polymer/Hydrophobically Associative Polymer
by Xi Li, Zhongbing Ye and Pingya Luo
Molecules 2025, 30(1), 109; https://doi.org/10.3390/molecules30010109 - 30 Dec 2024
Viewed by 391
Abstract
In this work, a hydrophobically associative polymer (HAP) was mixed with β-cyclodextrin and epichlorohydrin polycondensate (β-CDP) in an aqueous solution to enhance the intermolecular interaction through host–guest inclusion between hydrophobes and cyclodextrins. Results showed that the host–guest interaction improved the thickening ability and [...] Read more.
In this work, a hydrophobically associative polymer (HAP) was mixed with β-cyclodextrin and epichlorohydrin polycondensate (β-CDP) in an aqueous solution to enhance the intermolecular interaction through host–guest inclusion between hydrophobes and cyclodextrins. Results showed that the host–guest interaction improved the thickening ability and viscoelasticity of the HAP solution and maintained its shear thinning behavior. The host–guest inclusion system demonstrated special viscosity–temperature curves and variable activation energy. Enhanced oil recovery (EOR) performance tests showed that the oil increment produced by the host–guest inclusion system was 5.5% and 9.3% higher than that produced by the HAP and the partially hydrolyzed polyacrylamide solution, respectively. Compared with pure HAP, β-CDP/HAP has a better comprehensive performance and is more attractive for EOR in high-temperature reservoirs. Full article
(This article belongs to the Special Issue Applied Chemistry in Asia)
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Graphical abstract

14 pages, 5735 KiB  
Article
Development and Application of a Robust Imine-Based Covalent Organic Framework for Stir Bar Sorptive Extraction of Estrogens in Environmental Water
by Jianing Sun, Xixi Lian, Lianzhi Wang and Zhengchao Duan
Molecules 2024, 29(23), 5763; https://doi.org/10.3390/molecules29235763 - 6 Dec 2024
Cited by 1 | Viewed by 551
Abstract
A covalent organic framework (COF) based on imine was synthesized using 2,5-dihexoxyterephthalaldehyde (DHT) and 1,3,5-tris(4-aminophenyl) benzene (TAPB) as starting materials. The TAPB-DHT-COF exhibited satisfactory chemical stability, making it a promising adsorbing material for stir bar sorptive extraction (SBSE) of four estrogens, including estrone [...] Read more.
A covalent organic framework (COF) based on imine was synthesized using 2,5-dihexoxyterephthalaldehyde (DHT) and 1,3,5-tris(4-aminophenyl) benzene (TAPB) as starting materials. The TAPB-DHT-COF exhibited satisfactory chemical stability, making it a promising adsorbing material for stir bar sorptive extraction (SBSE) of four estrogens, including estrone (E1), β-estradiol (E2), hexestrol (HES), and mestranol (MeEE2), in ambient water samples. The extracted analytes were subsequently analyzed using a high-performance liquid chromatography-diode array detector (HPLC-DAD). A series of parameters affecting the SBSE process, such as solution pH, ionic strength, extraction time, and desorption solvent, were investigated by the controlled variable method. Under optimal conditions, the limit of detection (LODs) for the four targeted estrogens ranged from 0.06 to 0.15 µg/L, with a linear range from 0.2 to 100 µg/L. The observed enrichment factor (EF) ranged from 39 to 49, while the theoretical EF was estimated to be 50-fold. This methodology can be applied to the identification of estrogens in three environmental water samples. Full article
(This article belongs to the Special Issue Applied Chemistry in Asia)
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14 pages, 4167 KiB  
Article
Impact of Temperature and Substrate Type on the Optical and Structural Properties of AlN Epilayers: A Cross-Sectional Analysis Using Advanced Characterization Techniques
by Wenwang Wei, Yi Peng, Yuefang Hu, Xiuning Xu and Quanwen Xie
Molecules 2024, 29(22), 5249; https://doi.org/10.3390/molecules29225249 - 6 Nov 2024
Viewed by 705
Abstract
AlN, with its ultra-wide bandgap, is highly attractive for modern applications in deep ultraviolet light-emitting diodes and electronic devices. In this study, the surface and cross-sectional properties of AlN films grown on flat and nano-patterned sapphire substrates are characterized by a variety of [...] Read more.
AlN, with its ultra-wide bandgap, is highly attractive for modern applications in deep ultraviolet light-emitting diodes and electronic devices. In this study, the surface and cross-sectional properties of AlN films grown on flat and nano-patterned sapphire substrates are characterized by a variety of techniques, including photoluminescence spectroscopy, high-resolution X-ray diffraction, X-ray photoelectron spectroscopy, ultraviolet photoelectron spectroscopy, and Raman spectroscopy. The results indicate that different sapphire substrates have minimal impact on the photoluminescence spectrum of the epitaxial films. As the temperature increased, the radius of curvature of the AlN films increased, while the warpage decreased. The AlN films grown on nano-patterned substrates exhibited superior quality with less surface oxidation. During the growth of AlN thin films on different types of substrates, slight shifts in the energy bands occurred due to differences in the introduction of carbon-related impurities and intrinsic defects. The Raman shift and full width at half maximum (FWHM) of the E2(low), A1(TO), E2(high), E1(TO), and E1(LO) phonon modes for the cross-sectional AlN films varied with the depth and temperature. The stress state within the film was precisely determined with specific depths and temperatures. The FWHM of the E2(high) phonon mode suggests that the films grown on nano-patterned substrates exhibited better crystalline quality. Full article
(This article belongs to the Special Issue Applied Chemistry in Asia)
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11 pages, 2129 KiB  
Article
Pt Nanoparticles on Multi-Walled Carbon Nanotubes with High CO Tolerance for Methanol Electrooxidation
by Pingping Yang, Shiming Dong, You Shu and Xuejiao Wei
Molecules 2024, 29(21), 5015; https://doi.org/10.3390/molecules29215015 - 23 Oct 2024
Viewed by 762
Abstract
Anode catalysts are important for direct methanol fuel cells (DMFCs) of energy conversion. Herein, we report a novel strategy by ethylene glycol-based deep eutectic solvents (EG-DESs) for the fabrication of a multi-walled carbon nanotubes (MWCNTs)-supported Pt nanoparticles catalyst (referred to as Pt/CNTs-EG-DES). The [...] Read more.
Anode catalysts are important for direct methanol fuel cells (DMFCs) of energy conversion. Herein, we report a novel strategy by ethylene glycol-based deep eutectic solvents (EG-DESs) for the fabrication of a multi-walled carbon nanotubes (MWCNTs)-supported Pt nanoparticles catalyst (referred to as Pt/CNTs-EG-DES). The Pt/CNTs-EG-DES catalyst provides an increased electrochemically active surface area (ECSA) and shows remarkably improved electrocatalytic performance towards methanol oxidation reaction compared to Pt/CNTs-W (fabricated in water) and commercial Pt/C catalysts. The improved performance is attributed to the generation of more Pt–O bonds which change the electronic states of the Pt atoms and the special node structure that obtains more active sites for a high CO resistance. This study suggests an effective synthesis strategy for Pt-based electrocatalysts with high performance for DMFC applications. Full article
(This article belongs to the Special Issue Applied Chemistry in Asia)
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16 pages, 5576 KiB  
Article
Reaction Thermodynamic and Kinetics for Esterification of 1-Methoxy-2-Propanol and Acetic Acid over Ion-Exchange Resin
by Xinyu Liu, Shu Wang, Mingxia Wang, Lifang Chen and Zhiwen Qi
Molecules 2024, 29(19), 4709; https://doi.org/10.3390/molecules29194709 - 4 Oct 2024
Viewed by 1585
Abstract
The esterification of 1-methoxy-2-propanol (PM) and acetic acid (AA) is an important reaction for the production of 1-methoxy-2-propyl acetate (PMA). Herein, we used the macroporous ion-exchange resin Amberlyst-35 as a catalyst to explore the effects of reaction conditions on the reaction rate and [...] Read more.
The esterification of 1-methoxy-2-propanol (PM) and acetic acid (AA) is an important reaction for the production of 1-methoxy-2-propyl acetate (PMA). Herein, we used the macroporous ion-exchange resin Amberlyst-35 as a catalyst to explore the effects of reaction conditions on the reaction rate and equilibrium yield of PMA. Under the optimized conditions of a reaction temperature of 353 K, using the initial reactant PM/AA with a molar ratio of 1:3, and a catalyst loading of 10 wt%, the PMA equilibrium yield reached 78%, which is the highest equilibrium yield so far. The reaction equilibrium constants and activity coefficients were estimated to obtain reaction thermodynamic properties, indicating the exothermicity of the reaction. Furthermore, pseudo-homogeneous (PH), Eley–Rideal (ER), and Langmuir–Hinshelwood–Hougen–Watson (LHHW) kinetic models were fitted based on experimental reaction kinetic data. The results demonstrate that the LHHW model is the most consistent with experimental data, indicating a surface reaction-controlled process and exhibiting an apparent activation energy of 62.0 ± 0.2 kJ/mol. This work represents a valuable example of calculating reaction thermodynamics and kinetics, which are particularly essential for promising industrial reactor designs. Full article
(This article belongs to the Special Issue Applied Chemistry in Asia)
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