The catalytic role of Cr(VI) in promoting the degradation of organic pollutants via TiO2/SnO2/BiVO4 photoelectrocatalysis: as an electron transfer carrier

IF 7.6 2区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Environmental Pollution Pub Date : 2024-12-16 DOI:10.1016/j.envpol.2024.125543

Xing-Peng Wei, Hong-Gang Ni

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引用次数: 0

Abstract

Regarding the coexistence of heavy metals and organic pollutants, many studies have achieved synergistic removal of Cr(VI) and organic pollutants under acidic conditions. However, the role of Cr(VI) in the removal of organic pollutants under neutral conditions may have been overlooked. Here, the catalytic effect of Cr(VI) in promoting the photoelectrocatalytic degradation of organic pollutants was investigated using a ternary system, which was a combination of photocatalysis, electrocatalysis and Cr(VI) catalysis. A fabricated TiO₂/SnO₂/BiVO₄ composite was used as an anode for degradation experiments. We found that the degradation efficiency and final removal of rhodamine B (RhB), ofloxacin (OFL), and tetracycline (TC) were improved by increasing the Cr(VI) concentration within the range of 10 to 20 mg L^-1. And the addition of Cr(VI) sharply improved the removal of the three organic pollutants under the optimal conditions (from 65% to 96% for RhB, from 34% to 81% for OFL, and from 43% to 100% for TC). According to the results of different processing methods and quenching experiments, we proposed a new catalytic mechanism that, Cr(VI) promotes PEC degradation by acting as an electron transfer carrier between TiO₂/SnO₂/BiVO₄ and O₂.

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来源期刊

Environmental Pollution 环境科学-环境科学

CiteScore

16.00

自引率

6.70%

发文量

2082

审稿时长

2.9 months

期刊介绍： Environmental Pollution is an international peer-reviewed journal that publishes high-quality research papers and review articles covering all aspects of environmental pollution and its impacts on ecosystems and human health. Subject areas include, but are not limited to: • Sources and occurrences of pollutants that are clearly defined and measured in environmental compartments, food and food-related items, and human bodies; • Interlinks between contaminant exposure and biological, ecological, and human health effects, including those of climate change; • Contaminants of emerging concerns (including but not limited to antibiotic resistant microorganisms or genes, microplastics/nanoplastics, electronic wastes, light, and noise) and/or their biological, ecological, or human health effects; • Laboratory and field studies on the remediation/mitigation of environmental pollution via new techniques and with clear links to biological, ecological, or human health effects; • Modeling of pollution processes, patterns, or trends that is of clear environmental and/or human health interest; • New techniques that measure and examine environmental occurrences, transport, behavior, and effects of pollutants within the environment or the laboratory, provided that they can be clearly used to address problems within regional or global environmental compartments.