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Zn-AgInS/CdS Z型异质结与S掺杂还原氧化石墨烯协同作用对污染水中铬的高效去除

Synergistic effect of Zn-AgInS/CdS Z-scheme heterojunction and S-doped rGO for efficient removal of chromium from contaminated water.

作者信息

Mishra Soumya, Sahoo Naresh Kumar, Sahoo Prasanta Kumar, Sahoo Satyanjib, Rout Prangya Ranjan, Rath Goutam

机构信息

Department of Chemistry, Environmental Science and Technology Program, Faculty of Engineering and Technology (ITER), Siksha 'O' Anusandhan (Deemed to be University) Bhubaneswar 751030 Odisha India

Environmental Hydrology Division, National Institute of Hydrology Jalvigyan Bhawan Roorkee 247667 India.

出版信息

Nanoscale Adv. 2024 Sep 19;6(23):5925-38. doi: 10.1039/d4na00350k.

DOI:10.1039/d4na00350k
PMID:39359350
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11441470/
Abstract

This study aimed to synthesize a Zn-AgInS/CdS/SrGO nanocomposite for Cr(vi) removal from contaminated water under solar irradiation. To prevent photo corrosion of CdS, a Z-scheme heterojunction was formed between CdS and Zn-AgInS. The introduction of Ag plasmonic materials extended the light absorption range and stabilized the photocatalyst. Further, to improve the catalytic surface area, electrical conductivity, and minimize the rate of electron and hole pair recombination, the Zn-AgInS/CdS Z-scheme heterojunction was loaded onto S-doped rGO. The morphological and structural analysis of the synthesized nanomaterials (NMs) was done using various techniques, including XRD, FT-IR, UV-vis DRS, FESEM, TEM, EDAX, photoluminescence, and Raman spectroscopy. Results revealed that the Zn-AgInS/CdS/SrGO nanocomposite removed 85% of Cr(vi) at an initial concentration of 50 mg L in 180 min when exposed to solar irradiation. The simulated first-order kinetic model fitted to the experimental data for Cr(vi) reduction by the nanocomposite exhibits a high correlation coefficient ( ≥ 0.97) and the value for Zn-AgInS/CdS/SrGO ( = 0.0114 min) is around 1.6 times larger than that of bare ZnAgInS. Moreover, Zn-AgInS/CdS/SrGO heterojunctions show excellent reusability up to 4 cycles. Further, the possible photocatalytic mechanism of Cr(vi) reduction has been proposed. Therefore, the Zn-AgInS/CdS/SrGO nanocomposite could serve as an alternative photocatalyst system driven by solar light for Cr(vi) reduction.

摘要

本研究旨在合成一种Zn-AgInS/CdS/SrGO纳米复合材料，用于在太阳辐射下从受污染水中去除Cr(Ⅵ)。为防止CdS发生光腐蚀，在CdS和Zn-AgInS之间形成了Z型异质结。引入Ag等离子体材料扩展了光吸收范围并稳定了光催化剂。此外，为了提高催化表面积、电导率并最小化电子和空穴对的复合率，将Zn-AgInS/CdS Z型异质结负载到S掺杂的rGO上。使用包括XRD、FT-IR、UV-vis DRS、FESEM、TEM、EDAX、光致发光和拉曼光谱等各种技术对合成的纳米材料（NMs）进行了形态和结构分析。结果表明，当暴露于太阳辐射时，Zn-AgInS/CdS/SrGO纳米复合材料在初始浓度为50 mg/L的情况下，180分钟内去除了85%的Cr(Ⅵ)。拟合纳米复合材料还原Cr(Ⅵ)实验数据的模拟一级动力学模型具有较高的相关系数（≥0.97），并且Zn-AgInS/CdS/SrGO的k值（k = 0.0114 min⁻¹）约为裸ZnAgInS的1.6倍。此外，Zn-AgInS/CdS/SrGO异质结在高达4个循环中显示出优异的可重复使用性。此外，还提出了Cr(Ⅵ)还原可能的光催化机理。因此，Zn-AgInS/CdS/SrGO纳米复合材料可作为一种由太阳光驱动的用于Cr(Ⅵ)还原的替代光催化剂体系。

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