Construction of Bi2MoO6/CdS S-scheme heterojunction for highly efficiency photocatalytic reduction of Cr(VI) under visible light

IF 6.3 2区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of water process engineering Pub Date : 2024-11-30 DOI:10.1016/j.jwpe.2024.106693

Yuhang Wu , Jianping He , Ying Liu , Xiaohui Ma , Songbo Li , Guibao Guo , Yiguo Su , Meiting Song

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Abstract

The rising level of chromium pollution presents a substantial risk to both the environment and human well-being, making the elimination of Cr(VI) from water sources an imperative task. In this work, Bi₂MoO₆/CdS was synthesized by a simple hydrothermal method. When the mass ratio of Bi₂MoO₆ to CdS is 1:4 (0.2 g/L), the degradation efficiency of Cr(VI) (20 mg/L, pH = 3) was 100 % after 16 min of visible light irradiation, the reaction kinetic constant (0.2339 min⁻¹) was 334.1 and 3.5 times higher than single Bi₂MoO₆ and CdS. The photocatalytic activity is almost unchanged after five cycles (<4 %). Furthermore, the S-scheme pathway is proposed by free radical capture experiments, Electron Paramagnetic Resonance (EPR) detection and density functional theory (DFT) calculations. The S-scheme Bi₂MoO₆/CdS heterojunction promotes the separation of electron-hole pairs and accelerate electron transfer. This study provides a novel strategy for high-efficiency Cr(VI) reduction.

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来源期刊

Journal of water process engineering Biochemistry, Genetics and Molecular Biology-Biotechnology

CiteScore

10.70

自引率

8.60%

发文量

846

审稿时长

24 days

期刊介绍： The Journal of Water Process Engineering aims to publish refereed, high-quality research papers with significant novelty and impact in all areas of the engineering of water and wastewater processing . Papers on advanced and novel treatment processes and technologies are particularly welcome. The Journal considers papers in areas such as nanotechnology and biotechnology applications in water, novel oxidation and separation processes, membrane processes (except those for desalination) , catalytic processes for the removal of water contaminants, sustainable processes, water reuse and recycling, water use and wastewater minimization, integrated/hybrid technology, process modeling of water treatment and novel treatment processes. Submissions on the subject of adsorbents, including standard measurements of adsorption kinetics and equilibrium will only be considered if there is a genuine case for novelty and contribution, for example highly novel, sustainable adsorbents and their use: papers on activated carbon-type materials derived from natural matter, or surfactant-modified clays and related minerals, would not fulfil this criterion. The Journal particularly welcomes contributions involving environmentally, economically and socially sustainable technology for water treatment, including those which are energy-efficient, with minimal or no chemical consumption, and capable of water recycling and reuse that minimizes the direct disposal of wastewater to the aquatic environment. Papers that describe novel ideas for solving issues related to water quality and availability are also welcome, as are those that show the transfer of techniques from other disciplines. The Journal will consider papers dealing with processes for various water matrices including drinking water (except desalination), domestic, urban and industrial wastewaters, in addition to their residues. It is expected that the journal will be of particular relevance to chemical and process engineers working in the field. The Journal welcomes Full Text papers, Short Communications, State-of-the-Art Reviews and Letters to Editors and Case Studies