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Toxics
Special Issues
Oxidative Degradation and Toxicity of Environmental Pollutants
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Oxidative Degradation and Toxicity of Environmental Pollutants

A special issue of Toxics (ISSN 2305-6304). This special issue belongs to the section "Emerging Contaminants".

Deadline for manuscript submissions: 31 October 2025 | Viewed by 570

Special Issue Editors

Dr. Jianfei Sun

E-Mail Website
Guest Editor
School of Environmental and Material Engineering, Yantai University, Yantai 264005, China
Interests: volatile organic compounds degradation; transformation and degradation mechanism; atmospheric heterogeneous reactions; air pollution; theoretical calculations in quantum chemistry
Special Issues, Collections and Topics in MDPI journals
Dr. Bo Wei

E-Mail Website
Guest Editor
College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, China
Interests: volatile organic compound degradation; emerging contaminants; theoretical calculations in quantum chemistry; transformation and degradation mechanisms; reaction constants
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Continuous modernization requires the participation of numerous industrial sectors; however, industrial development must take sustainability into consideration.  Particularly, organic pollutants generated by many of these industries can enter water bodies, soil, and the atmosphere, causing environmental pollution that consequently leads to health issues and other problems.

In terms of atmospheric pollutants, the reaction of organic pollutants with oxidants such as hydroxyl radicals (•OH), nitrate radicals (•NO3), Cl atoms, and ozone is possibly a major degradation mechanism. When these pollutants are ingested, they disrupt the body's internal functions, leading to health issues such as cancer, cardiovascular disorders, reproductive complications, prenatal central nervous system impairments, and respiratory problems.

Advanced oxidation processes (AOPs) are one of the sustainable emerging technologies for treating refractory organic contaminants present in different industrial wastewaters and soil, such as textile, paper, pulp, pharmaceuticals, petrochemicals, and refinery by-products . These are usually discharged into the environment and degrade into additives like bisphenol A, phthalates, dioxins, polycyclic aromatic hydrocarbons (PAHs), polychlorinated biphenyls (PCBs), and heavy metals, which are carcinogenic and toxic.

This Topical Collection will focus on recent advancements in the oxidative degradation and toxicity of environmental pollutants, particularly emerging organic contaminants. Topics of interest include, but are not limited to, novel technologies for pollutant oxidative degradation, its underlying mechanisms, and related interdisciplinary insights.

Authors are invited to submit original research papers, reviews, and short communications.

Dr. Jianfei Sun
Dr. Bo Wei
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. Toxics is an international peer-reviewed open access monthly 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

  • oxidative degradation
  • toxicity
  • environmental pollutants
  • volatile organic compounds
  • reaction mechanisms
  • kinetics
  • advanced oxidation process

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Published Papers (1 paper)

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Research

17 pages, 1965 KiB  
Article
The Effect of the Antidepressant Citalopram on the Bioconcentration and Biomarker Response of Daphnia magna at Environmentally Relevant Concentrations
by Haohan Yang, Jiacheng Tan, Hanyu Jiang, Hao Xing, Jingnan Zhang, Dexin Kong, Zhuoyu Chen and Linghui Kong
Toxics 2025, 13(7), 532; https://doi.org/10.3390/toxics13070532 - 25 Jun 2025
Cited by 1 | Viewed by 414
Abstract
The widespread use and pseudo-persistent occurrence of the antidepressant citalopram (CIT) could pose a potential ecological risk in the aquatic environment. The message about the bioconcentration and sensitive biomarker identification of CIT at the environmentally relevant concentrations is limited. In this study, an [...] Read more.
The widespread use and pseudo-persistent occurrence of the antidepressant citalopram (CIT) could pose a potential ecological risk in the aquatic environment. The message about the bioconcentration and sensitive biomarker identification of CIT at the environmentally relevant concentrations is limited. In this study, an integral evaluation of the phenotypic and biochemical effects of CIT on Daphnia magna (D. magna) was conducted at 0.5 and 10 µg/L. The biomarker screening includes energy metabolism, phototactic behavior, feeding dysfunction, and antioxidant stress responses. The carbohydrate, lipid, and protein content was determined using the assay of anthrone with glucose as standard, thiophosphorate-Vaniline with cholesterol as standard, and Coomassie brilliant blue with serum albumin as standard, respectively. The results showed the bioconcentration equilibrium of CIT reached at the exposure duration of 48 h during the uptake process. At the exposure concentrations of 0.5 and 10 µg/L, the bioconcentration factor of CIT was 571.2 and 67.4 L/kg, respectively. Both protein and lipid content significantly increased at 0.5 µg/L with a 1.78-fold elevation in total energy. Comparatively, the lipid content showed a significant increase at 10 µg/L, while the available total energy rose by 1.25-fold relative to the control group. The phototactic behavior of D. magna exposed to 0.5 µg/L CIT was markedly reduced at 48 h relative to control. In contrast, a significant decrease in phototaxis was observed after 6 h and then a significant increase at 12 h with a continuously obvious decline at 10 µg/L. The filtration rates were increased by 32% compared to controls at 0.5 µg/L, while the stimulatory effects disappeared at 10 µg/L. With regarding to the antioxidant enzyme activities, CIT exposure significantly inhibited the catalase activity both at 0.5 and 10 µg/L, while the glutathione S-transferase activity was obviously induced at 0.5 µg/L and inhibited at 10 µg/L. The expression level of 18s gene was significantly decreased at 10 µg/L. Only the gst gene expression level was significantly increased at 0.5 µg/L, while the 18s and cat gene expression level was obviously inhibited and induced at 10 µg/L. Comprehensively, the responses of the phenotypic traits and energy metabolism of D. magna at various environmental concentrations were sensitive for CIT. This study provided basic data for the risk estimation of CIT in the real freshwater environment. Full article
(This article belongs to the Special Issue Oxidative Degradation and Toxicity of Environmental Pollutants)
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