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Advances in Chemical and Biochemical Technologies for Water and Wastewater Treatment

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

Deadline for manuscript submissions: 31 October 2026 | Viewed by 866

Editors

Dr. Athanasia Tekerlekopoulou

E-Mail Website
Guest Editor
Department of Sustainable Agriculture, School of Agricultural Sciences, University of Patras, 30100 Agrinio, Greece
Interests: technologies of drinking water treatment using physicochemical and biological processes; biological and physicochemical treatment of industrial wastewaters including dairy; olive mill; table olive; winery; hexavalent chromium-containing effluents; application of microalgae and cyanobacteria for wastewater treatment and the production of biofuels or other value-added products; and process modeling for the design of efficient and cost-effective drinking water and wastewater treatment systems
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Dimitris V. Vayenas

E-Mail Website
Guest Editor
1. Department of Chemical Engineering, School of Engineering, University of Patras, 26500 Patras, Greece
2. Institute of Chemical Engineering/Sciences (ICE-HT), Platani, 26504 Patras, Greece
Interests: decentralized wastewater treatment systems; agro-industrial and industrial wastewater treatment; potable water treatment; application of microalgae for wastewater treatment and biodiesel production; modeling of biological processes
Special Issues, Collections and Topics in MDPI journals
Dr. Christina Vasiliki Lazaratou

E-Mail Website
Guest Editor Assistant
1. Department of Chemical Engineering, University of Patras, GR-26504 Patras, Greece
2. Watera Hellas S.A., Research and Development Department, GR-13341, Athens, Greece
Interests: clay minerals and other engineered materials application as adsorbents for water and wastewater treatment; materials characterization (spectroscopy and physcico-chemical characteristics); biological methods for wastewater treatment; CO2 biofixation; electrocoagulation for water softening and wastewater treatment
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The advancement of technologies for the treatment of water and wastewater is imperative for the safeguarding of public health, the protection of aquatic ecosystems and the sustainable management of water resources, especially concerning the global demands on water resources. The interrelated challenges of rapid urbanization, industrial expansion, poor waste management and climate change have collectively exacerbated water scarcity, leading to an increase in the complexity and volume of contaminated effluents entering natural water bodies. Conventional treatment processes frequently prove to be inadequate in addressing the emergence of contaminants (such as pharmaceuticals, personal care products, microplastics, etc.), and, therefore, sustained research and technological advancement in the domains of water and wastewater treatment are imperative for achieving sustainable water management and catering to the mounting global demand for uncontaminated water. This Special Issue invites submissions presenting original scientific research and innovative approaches in water and wastewater treatment as a) advanced oxidation processes (AOPs); b) aerobic or anaerobic biological treatment methods; c) electrochemical or physicochemical methods; and d) membrane technologies. In addition, contributions focusing on hybrid and integrated treatment systems are highly encouraged. Particular emphasis is placed on technologies that promote sustainable management systems, resource recovery and circularity. These advancements have been demonstrated to enhance the efficiency of pollutant removal, whilst also enabling the recovery of valuable resources such as nutrients, energy, and reusable water. This aligns wastewater treatment with the principles of the circular economy.

Dr. Athanasia Tekerlekopoulou
Prof. Dr. Dimitris V. Vayenas
Guest Editors

Dr. Christina Vasiliki Lazaratou
Guest Editor Assistant

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 250 words) can be sent to the Editorial Office for assessment.

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-anonymized 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

  • water
  • wastewater
  • treatment
  • contaminant
  • pollutant
  • removal pharmaceutical
  • personal care product
  • microplastic
  • advanced oxidation processes
  • AOPs
  • aerobic
  • anaerobic
  • electrochemical
  • physicochemical
  • membrane

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Published Papers (2 papers)

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Research

18 pages, 7777 KB  
Article
Magnesium Oxide-Modified Alumina for Enhanced Adsorption of Multi-Sulfonated Azo Dyes: Performance and Mechanistic Insights
by Boning Jiang, Shuaiqi Chen, Xuhui Wang, Yujian Sun, Yaowen Wang, Wei Chu, Shuaijie Tang, Junwei Jia, Xiuchao Fu, Yue Bai, Xiangyu Xu and Jiaqing Song
Molecules 2026, 31(13), 2364; https://doi.org/10.3390/molecules31132364 - 5 Jul 2026
Viewed by 315
Abstract
Multi-sulfonated anionic azo dyes are difficult to remove from water because their high solubility and ionized sulfonate groups reduce their affinity toward many oxide adsorbents. In this study, magnesium oxide-modified alumina composites were prepared by loading magnesium oxide onto mesoporous alumina to increase [...] Read more.
Multi-sulfonated anionic azo dyes are difficult to remove from water because their high solubility and ionized sulfonate groups reduce their affinity toward many oxide adsorbents. In this study, magnesium oxide-modified alumina composites were prepared by loading magnesium oxide onto mesoporous alumina to increase the density of surface hydroxyl groups. Sunset Yellow and Amaranth were selected as model dyes containing two and three sulfonate groups, respectively. Compared with pristine alumina, the modified adsorbents exhibited higher isoelectric points, stronger hydroxyl-related infrared signals, and significantly enhanced adsorption capacities. At pH 4.0, the maximum adsorption capacities reached 787 mg/g for Sunset Yellow and 709 mg/g for Amaranth. Notably, MgA-2 exhibited the highest utilization efficiency of MgO active sites. Adsorption kinetics were well described by the pseudo-second-order model, while equilibrium data followed the Langmuir model. Mechanistic analysis indicated that adsorption process mainly proceeded through ion exchange between surface hydroxyl groups and dye sulfonate groups. The higher adsorption capacity of Sunset Yellow was attributed to its lower number of sulfonate groups and lower demand for hydroxyl binding sites. These results demonstrate that magnesium oxide modification is an effective strategy for enhancing alumina-based adsorbents for the removal of multi-sulfonated anionic dyes from water. Full article
(This article belongs to the Special Issue Advances in Chemical and Biochemical Technologies for Water and Wastewater Treatment)
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21 pages, 3073 KB  
Article
Fenton Catalytic Degradation of Rhodamine B by Zero-Valent Iron/Alumina Catalyst
by Kexin Ge, Shuaiqi Chen, Boning Jiang, Xuhui Wang, Xiangyu Xu and Jiaqing Song
Molecules 2026, 31(13), 2270; https://doi.org/10.3390/molecules31132270 - 29 Jun 2026
Viewed by 313
Abstract
Rhodamine B (RhB) is a typical xanthene-based cationic dye. Its widespread application has brought serious safety and environmental risks. Heterogeneous Fenton systems based on zero-valent iron (Fe0) are promising for RhB degradation. However, bare Fe0 suffers from severe agglomeration and [...] Read more.
Rhodamine B (RhB) is a typical xanthene-based cationic dye. Its widespread application has brought serious safety and environmental risks. Heterogeneous Fenton systems based on zero-valent iron (Fe0) are promising for RhB degradation. However, bare Fe0 suffers from severe agglomeration and surface passivation. In this study, alumina with a large pore volume and high specific surface area was employed as a support to enhance Fe0 dispersion and stability. The catalyst was prepared via a glucose-assisted carbothermal reduction method, and the formation of Fe0 was confirmed by X-ray diffraction and electron microscopy analyses. Under optimal conditions (pH = 3.58, catalyst dosage = 0.8 g·L−1, H2O2 = 10 mM), 10 mg·L−1 RhB was completely degraded within 25 min, with a pseudo-first-order rate constant of 0.432 min−1. This exhibits a faster degradation rate and efficiency advantage. Radical quenching experiments indicated that hydroxyl radicals (•OH) were the dominant reactive species, while singlet oxygen (1O2) also contributed to the degradation process. Two primary degradation pathways, including N-deethylation and hydroxylation, were identified. The catalyst showed moderate reusability with slight deactivation after repeated cycles. This study demonstrates that tailoring the pore structure of alumina supports is an effective strategy to enhance Fe0 dispersion, mass transfer, and catalytic performance in heterogeneous Fenton systems. Full article
(This article belongs to the Special Issue Advances in Chemical and Biochemical Technologies for Water and Wastewater Treatment)
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