Toxics

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Dear Colleagues,

The presence of various pollutants in the environment causes concern due to their potential adverse effects on the ecosystem and human beings. Pollutants such as heavy metals, chlorinated solvents, petroleum hydrocarbons, polycyclic aromatic hydrocarbons, polychlorinated biphenyls, polybrominated diphenyl ethers, per- and poly-fluorinated compounds, pesticides, antibiotics, micro- and nano-plastics, etc., may be transported and transformed in the environment, and these processes are influenced by many factors, such as the physical, chemical, and biological properties of the pollutants, the physio-chemical and biological properties of the matrix, and the environmental conditions. Understanding the environmental processes of pollutants as well as their effects helps to establish sound science-based regulations and develop effective management practices.

This Special Issue seeks papers on advanced research in the environmental processes of pollutants. Potential topics include, but are not limited to, the following:

(1) Technologies for measurements of pollutants;

(2) Approaches to characterize environmental transport and transformation;

(3) Methods to predict and quantify environmental processes;

(4) Assessments of interactions between pollutants and the environmental matrix;

(5) Effects of transport and transformation of pollutants.

Dr. Xiaoxia Lu
Guest Editor

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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.

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Keywords

pollutants
transport
transformation
effects
environmental processes

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Research

13 pages, 5913 KiB

Open AccessFeature PaperArticle

Adsorption of Pyrene and Arsenite by Micro/Nano Carbon Black and Iron Oxide

by Shuai Zhang, Gulijiazi Yeerkenbieke, Shuai Shi, Zhaoyang Wang, Lijin Yi and Xiaoxia Lu

Toxics 2024, 12(4), 251; https://doi.org/10.3390/toxics12040251 - 29 Mar 2024

Viewed by 544

Abstract

Polycyclic aromatic hydrocarbons (PAHs) and arsenic (As) are common pollutants co-existing in the environment, causing potential hazards to the ecosystem and human health. How their behaviors are affected by micro/nano particles in the environment are still not very clear. Through a series of static adsorption experiments, this study investigated the adsorption of pyrene and arsenite (As (III)) using micro/nano carbon black and iron oxide under different conditions. The objectives were to determine the kinetics and isotherms of the adsorption of pyrene and As (III) using micro/nano carbon black and iron oxide and evaluate the impact of co-existing conditions on the adsorption. The microstructure of micro/nano carbon black (C 94.03%) is spherical-like, with a diameter of 100–200 nm. The micro/nano iron oxide (hematite) has irregular rod-shaped structures, mostly about 1 µm long and 100–200 nm wide. The results show that the micro/nano black carbon easily adsorbed the pyrene, with a pseudo-second-order rate constant of 0.016 mg/(g·h) and an adsorption capacity of 283.23 μg/g at 24 h. The micro/nano iron oxide easily adsorbed As (III), with a pseudo-second-order rate constant of 0.814 mg/(g·h) and an adsorption capacity of 3.45 mg/g at 24 h. The mechanisms of adsorption were mainly chemical reactions. Micro/nano carbon black hardly adsorbed As (III), but its adsorption capability for pyrene was reduced by the presence of As (III), and this effect increased with an increase in the As (III) concentration. The adsorbed pyrene on the micro/nano black carbon could hardly be desorbed. On the other hand, the micro/nano iron oxide could hardly adsorb the pyrene, but its adsorption capability for As (III) was increased by the presence of pyrene, and this effect increased with an increase in the pyrene concentration. The results of this study provide guidance for the risk management and remediation of the environment when there is combined pollution of PAHs and As. Full article

(This article belongs to the Special Issue Environmental Transport and Transformation of Pollutants)

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