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Molecules
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Catalytic Purification of Environmental Pollutants and the Chemical Reactions
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Catalytic Purification of Environmental Pollutants and the Chemical Reactions

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

Deadline for manuscript submissions: 31 October 2024 | Viewed by 1854

Special Issue Editor

Prof. Dr. Huawen Hu

E-Mail Website
Guest Editor
School of Materials Science and Hydrogen Energy, Foshan University, Foshan, China
Interests: carbocatalysts; graphene; biochar; catalytic reduction; adsorption; photocatalytic reactions; CO2 electroreduction

Special Issue Information

Dear Colleagues,

Environmental pollution poses an increasingly serious threat to humans with the development of industries and society. The purification of various environmental pollutants with catalysts has received significant attention worldwide based on a variety of chemical processes (including Fenton, Fenton-like, enzymatic, photocatalytic, and photocatalytic combined with Fenton or Fenton-like oxidation, zero-valent-iron-based reduction, chemical reduction in the presence of reducing agents (especially sodium borohydride), electrocatalytic oxidation, a combination thereof, etc.). To obtain efficient and durable chemical purification reactions, researchers have designed and fabricated a wide range of catalysts (primarily metal-based and metal-free ones) with notable activity and stability, along with a deep understanding of the catalysis and purification processes at the molecular or even atomic level. While the single chemical process promoted by a catalyst now becomes insufficient to meet the growing demand for purification efficiency and durability, the combination of different catalytic purification processes attracts increasing attention, such as Fenton-like oxidation combined with photocatalysis and Fenton coupled with persulfate-based oxidation. This Special Issue belongs to a hot-spot area that is undergoing increasing attention worldwide, which will gain substantial concerns over a range of critical environmental and sustainable scientific disciplines.

Prof. Dr. Huawen Hu
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

  • metal-based catalysts
  • metal-free catalysts
  • fenton-like chemical reactions
  • photocatalytic oxidation
  • persulfate-mediated photocatalytic oxidation
  • chemical reduction
  • catalytic purification efficiency
  • stability

Published Papers (2 papers)

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Research

11 pages, 3038 KiB  
Communication
Degradation Product-Promoted Depolymerization Strategy for Chemical Recycling of Poly(bisphenol A carbonate)
by Maoqing Chai, Guangqiang Xu, Rulin Yang, Hongguang Sun and Qinggang Wang
Molecules 2024, 29(3), 640; https://doi.org/10.3390/molecules29030640 - 30 Jan 2024
Viewed by 946
Abstract
The accumulation of waste plastics has a severe impact on the environment, and therefore, the development of efficient chemical recycling methods has become an extremely important task. In this regard, a new strategy of degradation product-promoted depolymerization process was proposed. Using N, [...] Read more.
The accumulation of waste plastics has a severe impact on the environment, and therefore, the development of efficient chemical recycling methods has become an extremely important task. In this regard, a new strategy of degradation product-promoted depolymerization process was proposed. Using N,N′-dimethyl-ethylenediamine (DMEDA) as a depolymerization reagent, an efficient chemical recycling of poly(bisphenol A carbonate) (BPA-PC or PC) material was achieved under mild conditions. The degradation product 1,3-dimethyl-2-imidazolidinone (DMI) was proven to be a critical factor in facilitating the depolymerization process. This strategy does not require catalysts or auxiliary solvents, making it a truly green process. This method improves the recycling efficiency of PC and promotes the development of plastic reutilization. Full article
(This article belongs to the Special Issue Catalytic Purification of Environmental Pollutants and the Chemical Reactions)
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20 pages, 11456 KiB  
Article
A Fresh Perspective on the Impact of ZnTiO3 Coupling on the Microstructure and Photocatalytic Properties of TiO2 Fabricated at Varied Temperatures
by Yuanyuan Zhong, Xiuping Zhang, Yangwen Xia, Ling Zhang, Qiao Xu, Xiaodong Zhu, Wei Feng and Qin Qin
Molecules 2023, 28(22), 7626; https://doi.org/10.3390/molecules28227626 - 16 Nov 2023
Viewed by 692
Abstract
ZnTiO3/TiO2 composite photocatalysts were synthesized via the sol–gel technique, and the impact of varying heat treatment temperatures (470, 570, 670 °C) on their crystalline arrangement, surface morphology, elemental composition, chemical state, specific surface area, optical characteristics, and photocatalytic efficacy was [...] Read more.
ZnTiO3/TiO2 composite photocatalysts were synthesized via the sol–gel technique, and the impact of varying heat treatment temperatures (470, 570, 670 °C) on their crystalline arrangement, surface morphology, elemental composition, chemical state, specific surface area, optical characteristics, and photocatalytic efficacy was systematically investigated. The outcomes revealed that, as the temperature ascends, pure TiO2 undergoes a transition from anatase to rutile, ultimately forming a hybrid crystal structure at 670 °C. The incorporation of ZnTiO3 engenders a reduction in the TiO2 grain dimensions and retards the anatase-to-rutile phase transition. Consequently, the specimens manifest a composite constitution of anatase and ZnTiO3. In contrast, for pure TiO2, the specimen subjected to 670 °C annealing demonstrates superior photocatalytic performance due to its amalgamated crystal arrangement. The degradation efficacy of methylene blue (MB) aqueous solution attains 91% within a 60-min interval, with a calculated first-order reaction rate constant of 0.039 min−1. Interestingly, the ZnTiO3/TiO2 composite photocatalysts exhibit diminished photocatalytic activity in comparison to pristine TiO2 across all three temperature variations. Elucidation of the photocatalytic mechanism underscores that ZnTiO3 coupling augments the generation of photogenerated charge carriers. Nonetheless, concurrently, it undermines the crystalline integrity of the composite, yielding an excess of amorphous constituents that impede the mobility of photoinduced carriers. This dual effect also fosters escalated recombination of photogenerated charges, culminating in diminished quantum efficiency and reduced photocatalytic performance. Full article
(This article belongs to the Special Issue Catalytic Purification of Environmental Pollutants and the Chemical Reactions)
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