Pyrocatalytic removal of Cr(VI) by MoS2 nanosheets under controlled thermal fluctuation

IF 5.2 2区化学 Q1 CHEMISTRY, APPLIED

Catalysis Today Pub Date : 2024-11-05 DOI:10.1016/j.cattod.2024.115123

Tanmoy Ghosh , Imran Khan , Subhajit Saha

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引用次数: 0

Abstract

Traditionally, photocatalysts have been considered as effective tool to combat water pollution caused by Cr(VI) contamination. However, absence of sunlight in night and poor transmittance in the waste water restrict their wide-spread practical applications. Herein, two dimensional MoS₂ nanosheets have been employed as pyrocatalyst for round-o-clock utilization of natural temperature fluctuation and consequent reduction of Cr(VI). MoS₂ pyrocatalysts have been synthesized via facile hydrothermal technique and further characterized by XRD, XPS, SEM technique. The developed pyrocatalyst exhibits ∼95 % removal of 80 ppm Cr(VI) under thermal cycles between 20 ºC and 70 ºC. Moreover, the pyrocatalyst can effectively harness natural temperature variation for the catalytic reduction of Cr(VI) in just 30 days. The excited electrons generated during the temperature variation are identified as active species responsible for Cr(VI) reduction. The results and concept presented here may bring new possibilities for the removal of heavy metal ions in waste water treatment technology.

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MoS2 纳米片在受控热波动条件下催化去除六价铬

传统上，光催化剂一直被认为是治理六价铬污染造成的水污染的有效工具。然而，由于夜间没有阳光，且在废水中的透过率较低，限制了其广泛的实际应用。在这里，二维 MoS2 纳米片被用作热催化剂，可全天候利用自然温度波动，从而减少六价铬。MoS2 热催化剂是通过简单的水热技术合成的，并通过 XRD、XPS 和 SEM 技术进行了进一步表征。在 20 ºC 至 70 ºC 的热循环条件下，所开发的热催化剂对 80 ppm Cr(VI) 的去除率高达 95%。此外，这种高温催化剂还能有效利用自然温度变化，在短短 30 天内催化还原六价铬。温度变化过程中产生的激发电子被确定为负责还原六价铬的活性物种。本文介绍的结果和概念可能会为废水处理技术中重金属离子的去除带来新的可能性。

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

Catalysis Today 化学-工程：化工

CiteScore

11.50

自引率

3.80%

发文量

573

审稿时长

2.9 months

期刊介绍： Catalysis Today focuses on the rapid publication of original invited papers devoted to currently important topics in catalysis and related subjects. The journal only publishes special issues (Proposing a Catalysis Today Special Issue), each of which is supervised by Guest Editors who recruit individual papers and oversee the peer review process. Catalysis Today offers researchers in the field of catalysis in-depth overviews of topical issues. Both fundamental and applied aspects of catalysis are covered. Subjects such as catalysis of immobilized organometallic and biocatalytic systems are welcome. Subjects related to catalysis such as experimental techniques, adsorption, process technology, synthesis, in situ characterization, computational, theoretical modeling, imaging and others are included if there is a clear relationship to catalysis.