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Molecules
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Advanced Chemical Approaches and Technologies in Water Treatment
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Advanced Chemical Approaches and Technologies in Water Treatment

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

Deadline for manuscript submissions: 31 December 2024 | Viewed by 2929

Special Issue Editor

Dr. Xuehui Xie

E-Mail Website
Guest Editor
College of Environmental Science and Engineering, Ministry of Education, State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, Donghua University, Shanghai 201620, China
Interests: chemical approaches in water treatment; pollutant degradation; co-metabolism; microbial community structures; azo dye; anthraquinone dye; metagenomics; metaproteomics; molecular mechanism

Special Issue Information

Dear Colleagues,

The purpose of water treatment is to improve water quality to meet certain water quality standards. The scope of this new Special Issue includes chemical, biological, and biochemical processes aiming to increase sustainable water quality, as well as water environmental monitoring and remediation. This includes, but is not limited to, activated sludge processes, fixed biofilm processes, and combined biological processes; physical and chemical methods, such as granular media filtration, activated carbon adsorption, chemical precipitation, membrane processes, etc.; and natural treatment methods, such as stabilization ponds, oxidation ditches, and constructed wetlands.

We encourage submissions focusing broadly on molecular biology, biochemistry, genetics, metabolic engineering, synthetic biology, and data analytics with biotechnological applications. We are also eager to publish papers describing biotechnological process development, including bioreactor design and scale-up.

Chemical and biological approaches in water treatment focuses on the following areas:

  • Development and application of new chemical flocculant.
  • Biodegradation.
  • Anaerobic/aerobic treatment.
  • Metabolic engineering.
  • Cell-free and immobilized enzyme processes.
  • Enzyme engineering, production, and analysis.
  • Chemicals’ life cycle assessments and environmental impact analyses.

Dr. Xuehui Xie
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

  • wastewater
  • refractory pollutants
  • biodegradation
  • chemical flocculants
  • anaerobic/aerobic
  • life cycle assessment
  • environmental impact analysis

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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

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14 pages, 4372 KiB  
Article
One-Pot Preparation of Layered Double Hydroxide-Engineered Boric Acid Root and Application in Wastewater
by Fengrong Zhang, Cuilan Zhang, Kaixuan Zhang, Lishun Wu and Dandan Han
Molecules 2024, 29(13), 3204; https://doi.org/10.3390/molecules29133204 - 5 Jul 2024
Viewed by 594
Abstract
Heavy metals and organic pollutants are prevalent in water bodies, causing great damage to the environment and human beings. Hence, it is urgent to develop a kind of adsorbent with good performance. Anion interlacing layered double hydroxides (LDHs) are a promising adsorbent for [...] Read more.
Heavy metals and organic pollutants are prevalent in water bodies, causing great damage to the environment and human beings. Hence, it is urgent to develop a kind of adsorbent with good performance. Anion interlacing layered double hydroxides (LDHs) are a promising adsorbent for the sustainable removal of heavy metal ions and dyes from wastewater. Using aluminum chloride, zinc chloride and ammonium pentaborate tetrahydrate (NH4B5O8 · 4H2O, BA) as raw materials, the LDHs complex (BA-LDHs) of B5O8− intercalation was prepared by one-step hydrothermal method. The BA-LDHs samples were characterized by a X-ray powder diffractometer (XRD), scanning electron microscope (SEM), Fourier transform infrared spectrometer (FT-IR) and the Brunauer–Emmett–Teller (BET) method. The results showed that B5O8- was successfully intercalated. Adsorption experimental results suggested that BA-LDHs possess a maximum adsorption capacity of 18.7, 57.5, 70.2, and 3.12 mg·g−1 for Cd(II), Cu(II), Cr(VI) and Methylene blue (MB) at Cs = 2 g·L−1, respectively. The adsorption experiment conforms to the Langmuir and Freundlich adsorption models, and the kinetic adsorption data are well fitted by the pseudo-second-order adsorption kinetic equation. The as-prepared BA-LDHs have potential application prospects in the removal of heavy metals and dyes in wastewater. More importantly, they also provide a strategy for preparing selective adsorbents. Full article
(This article belongs to the Special Issue Advanced Chemical Approaches and Technologies in Water Treatment)
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12 pages, 1308 KiB  
Article
Effective Removal of Different Heavy Metals Ion (Cu, Pb, and Cd) from Aqueous Solutions by Various Molecular Weight and Salt Types of Poly-γ-Glutamic Acid
by Sheng-Yen Tsai, Chao-Kai Chang, Pei-Yu Wei, Shi-Ying Huang, Mohsen Gavahian, Shella Permatasari Santoso and Chang-Wei Hsieh
Molecules 2024, 29(5), 1054; https://doi.org/10.3390/molecules29051054 - 28 Feb 2024
Cited by 1 | Viewed by 1267
Abstract
In light of industrial developments, water pollution by heavy metals as hazardous chemicals has garnered attention. Addressing the urgent need for efficient heavy metal removal from aqueous environments, this study delves into using poly-γ-glutamic acid (γ-PGA) for the bioflocculation of heavy metals. Utilizing [...] Read more.
In light of industrial developments, water pollution by heavy metals as hazardous chemicals has garnered attention. Addressing the urgent need for efficient heavy metal removal from aqueous environments, this study delves into using poly-γ-glutamic acid (γ-PGA) for the bioflocculation of heavy metals. Utilizing γ-PGA variants from Bacillus subtilis with different molecular weights and salt forms (Na-bonded and Ca-bonded), the research evaluates their adsorption capacities for copper (Cu), lead (Pb), and cadmium (Cd) ions. It was found that Na-bonded γ-PGA with a high molecular weight showed the highest heavy metal adsorption (92.2–98.3%), particularly at a 0.5% concentration which exhibited the highest adsorption efficiency. Additionally, the study investigated the interaction of γ-PGA in mixed heavy metal environments, and it was discovered that Na-γ-PGA-HM at a 0.5% concentration showed a superior adsorption efficiency for Pb ions (85.4%), highlighting its selectivity as a potential effective biosorbent for wastewater treatment. This research not only enlightens the understanding of γ-PGA’s role in heavy metal remediation but also underscores its potential as a biodegradable and non-toxic alternative for environmental cleanup. The findings pave the way for further exploration into the mechanisms and kinetics of γ-PGA’s adsorption properties. Full article
(This article belongs to the Special Issue Advanced Chemical Approaches and Technologies in Water Treatment)
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Review

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31 pages, 3353 KiB  
Review
Chemical-Assisted CO2 Water-Alternating-Gas Injection for Enhanced Sweep Efficiency in CO2-EOR
by Pengwei Fang, Qun Zhang, Can Zhou, Zhengming Yang, Hongwei Yu, Meng Du, Xinliang Chen, Yuxuan Song, Sicai Wang, Yuan Gao, Zhuoying Dou and Meiwen Cao
Molecules 2024, 29(16), 3978; https://doi.org/10.3390/molecules29163978 - 22 Aug 2024
Viewed by 735
Abstract
CO2-enhanced oil recovery (CO2-EOR) is a crucial method for CO2 utilization and sequestration, representing an important zero-carbon or even negative-carbon emission reduction technology. However, the low viscosity of CO2 and reservoir heterogeneity often result in early gas [...] Read more.
CO2-enhanced oil recovery (CO2-EOR) is a crucial method for CO2 utilization and sequestration, representing an important zero-carbon or even negative-carbon emission reduction technology. However, the low viscosity of CO2 and reservoir heterogeneity often result in early gas breakthrough, significantly reducing CO2 utilization and sequestration efficiency. A water-alternating-gas (WAG) injection is a technique for mitigating gas breakthrough and viscous fingering in CO2-EOR. However, it encounters challenges related to insufficient mobility control in highly heterogeneous and fractured reservoirs, resulting in gas channeling and low sweep efficiency. Despite the extensive application and research of a WAG injection in oil and gas reservoirs, the most recent comprehensive review dates back to 2018, which focuses on the mechanisms of EOR using conventional WAG. Herein, we give an updated and comprehensive review to incorporate the latest advancements in CO2-WAG flooding techniques for enhanced sweep efficiency, which includes the theory, applications, fluid displacement mechanisms, and control strategies of a CO2-WAG injection. It addresses common challenges, operational issues, and remedial measures in WAG projects by covering studies from experiments, simulations, and pore-scale modeling. This review aims to provide guidance and serve as a reference for the application and research advancement of CO2-EOR techniques in heterogeneous and fractured reservoirs. Full article
(This article belongs to the Special Issue Advanced Chemical Approaches and Technologies in Water Treatment)
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