Treatment of chromium-contaminated water using a highly efficient, novel ternary synergistic S–rGO–BiOBr–In2S3 heterojunction

IF 5.2 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
Satyanjib Sahoo, Naresh Kumar Sahoo, Prasanta Kumar Sahoo, Soumya Mishra, Arun Kumar, Brundabana Naik and Prangya Ranjan Rout
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Abstract

The goal of the current study is to form a Z-scheme heterojunction between narrow band gap In2S3 (indium sulphide) and wide band gap BiOBr (bismuth oxobromide) to minimize the photoinduced charge carrier recombination and increase the visible light harvesting capacity of the nanocomposite for Cr(VI) elimination from polluted water. The exfoliated and corrugated S-doped rGO (sulphur-doped graphene oxide) were used to enhance the surface area and conductivity, encourage nucleation, and act as anchor sites for interfacial contact between BiOBr and In2S3 to facilitate efficient charge transfer. In this work, a BiOBr–In2S3–SrGO nanocomposite was successfully synthesized by a facile hydrothermal method. The optical and physicochemical properties of the synthesized nanomaterials (NMs) were characterized using XRD, FTIR, FE-SEM, EDAX, HRTEM, XPS, UV-DRS, Raman and photoluminescence spectroscopy. The results reveal that almost 96.6% Cr(VI) removal was achieved from an initial Cr(VI) dose of 100 mg L−1 by the nanocomposite within 2 h under the illumination of solar light. On the other hand, the Cr(VI) reduction was limited to 33.4% and 30.9% using the individual NMs of BiOBr and In2S3, respectively. The reduction of Cr(VI) follows pseudo-first-order kinetics. The calculated apparent rate constant (Kapp) of the nanocomposite was 3 times more than the individual NMs of BiOBr and In2S3, with an excellent recycling activity.

Abstract Image

高效新型三元协同S-rGO-BiOBr-In2S3异质结处理铬污染水
本研究的目标是在窄带隙的In2S3(硫化铟)和宽带隙的BiOBr(氧溴化铋)之间形成Z-scheme异质结,以最大限度地减少光诱导载流子重组,并增加纳米复合材料的可见光收集能力,用于从污染水中去除Cr(VI)。剥落和波纹状的s掺杂rGO(硫掺杂氧化石墨烯)被用来增加表面积和电导率,促进成核,并作为BiOBr和In2S3之间界面接触的锚点,以促进有效的电荷转移。本文采用水热法成功合成了一种bibr - in2s3 - srgo纳米复合材料。采用XRD、FTIR、FE-SEM、EDAX、HRTEM、XPS、UV-DRS、拉曼光谱和光致发光光谱对合成的纳米材料(NMs)的光学和物理化学性质进行了表征。结果表明,在太阳光照下,当初始Cr(VI)剂量为100 mg L−1时,纳米复合材料在2 h内可达到96.6%的Cr(VI)去除率。另一方面,使用BiOBr和In2S3的单个NMs, Cr(VI)的降低率分别限制在33.4%和30.9%。Cr(VI)的还原遵循准一级动力学。计算得到的表观速率常数(Kapp)是BiOBr和In2S3的3倍以上,具有良好的循环活性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Materials Advances
Materials Advances MATERIALS SCIENCE, MULTIDISCIPLINARY-
CiteScore
7.60
自引率
2.00%
发文量
665
审稿时长
5 weeks
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