Decontamination of hexavalent chromium in aqueous systems through reduction with silver doped zinc oxide nanoparticles

IF 2.7 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Letters Pub Date : 2024-11-02 DOI:10.1016/j.matlet.2024.137647

Ghazala Ahmad , Dilawar Farhan Shams , Seema Anjum Khattak , Waliullah Khan , Akhtar Nadhman

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Abstract

Hexavalent chromium (Cr(VI)) is the most toxic state of chromium that can lead to serious ecological and human health consequences. This research investigated the efficacy of visible-light-active silver-doped zinc oxide (Ag-Doped ZnO) nanoparticles to remove Cr(VI) via reduction to a non-toxic state. The study was focused on determining the optimum Ag-Doped ZnO dose for Cr(VI) removal under the effect of pH, and investigating the kinetics of Cr(VI) reduction. The ZnO NPs were prepared using the co-precipitation method and doping with Ag was achieved with KOH and thermal decomposition. Cr(VI) removal was efficient at NP:Cr(VI) ratios of 50:1 and 25:1 achieving 100 % removal in 24 h and 48 h respectively. The removal process was hindered at pH below 6 and above 9 at a lower NP dose. The test for contact time, showed that 42 ± 9 % of the removal was attained in the first 6 h while most of the removal (73 ± 8 %) occurred in the first 12 h. The rate constant revealed that the reduction with Ag-Doped ZnO exhibited a pseudo-first-order kinetic rate with k values of −0.065 ± 0.01 mg/L.h⁻¹.

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通过掺银氧化锌纳米颗粒的还原作用净化水体系中的六价铬

六价铬（Cr(VI)）是铬中毒性最强的一种，会对生态和人类健康造成严重影响。本研究调查了可见光活性银掺杂氧化锌（Ag-Doped ZnO）纳米粒子通过还原至无毒状态去除六价铬的功效。研究的重点是确定在 pH 值影响下去除六价铬的最佳掺银氧化锌剂量，并研究六价铬的还原动力学。ZnO NPs 采用共沉淀法制备，并通过 KOH 和热分解掺杂 Ag。氮氧化物与六价铬的比例分别为 50:1 和 25:1时，六价铬的去除率分别为 100%（24 小时和 48 小时）。当 NP 剂量较低时，pH 值低于 6 和高于 9 时，去除过程受到阻碍。接触时间测试表明，42 ± 9 % 的去除率是在最初的 6 小时内实现的，而大部分去除率（73 ± 8 %）是在最初的 12 小时内实现的。速率常数显示，掺银氧化锌的还原表现出伪一阶动力学速率，k 值为 -0.065 ± 0.01 mg/L.h-1。

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 Letters 工程技术-材料科学：综合

CiteScore

5.60

自引率

3.30%

发文量

1948

审稿时长

50 days

期刊介绍： Materials Letters has an open access mirror journal Materials Letters: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review. Materials Letters is dedicated to publishing novel, cutting edge reports of broad interest to the materials community. The journal provides a forum for materials scientists and engineers, physicists, and chemists to rapidly communicate on the most important topics in the field of materials. Contributions include, but are not limited to, a variety of topics such as: • Materials - Metals and alloys, amorphous solids, ceramics, composites, polymers, semiconductors • Applications - Structural, opto-electronic, magnetic, medical, MEMS, sensors, smart • Characterization - Analytical, microscopy, scanning probes, nanoscopic, optical, electrical, magnetic, acoustic, spectroscopic, diffraction • Novel Materials - Micro and nanostructures (nanowires, nanotubes, nanoparticles), nanocomposites, thin films, superlattices, quantum dots. • Processing - Crystal growth, thin film processing, sol-gel processing, mechanical processing, assembly, nanocrystalline processing. • Properties - Mechanical, magnetic, optical, electrical, ferroelectric, thermal, interfacial, transport, thermodynamic • Synthesis - Quenching, solid state, solidification, solution synthesis, vapor deposition, high pressure, explosive