Hexavalent chromium removal using reduced graphene oxide-zinc oxide composite fabricated via simple pyrolysis method

IF 7.5 Q1 CHEMISTRY, PHYSICAL Applied Surface Science Advances Pub Date : 2023-12-14 DOI:10.1016/j.apsadv.2023.100535
Reshma S Philip, Aparna N, Meril Mathew
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Abstract

The contamination of water by heavy metals from various industrial effluents is a significant factor contributing to the scarcity of clean water worldwide. To address this issue, there is a need to develop low-cost adsorbents to remove heavy metals from contaminated water reduced graphene oxide (rGO) based composites are efficient adsorbers of heavy metals. In this study, a green and rapid single-step heating process was utilized to prepare both rGO and rGO/ZnO composite materials, avoiding the use of any toxic reagents. The rGO/ZnO composite synthesized from sucrose and zinc acetate demonstrates a remarkable ability to adsorb hexavalent chromium (Cr(VI)). The Cr adsorption studies were carried out by varying adsorbent, contact time, initial pH, and concentration. The adsorption efficiency of the composite is five times higher than that of pure rGO. The adsorption mechanism of Cr(VI) onto the adsorbent is electrostatic interaction, complexation, pore filling, and reduction, identified through Zeta potential measurement, BET, EDX, and XPS analysis. These studies suggest that rGO/ZnO composite has great potency as a cost-effective and efficient adsorbent for removing Cr(VI) contaminants from industrial effluents.

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利用通过简单热解方法制造的还原氧化石墨烯-氧化锌复合材料去除六价铬
来自各种工业废水的重金属对水的污染是造成全世界清洁水短缺的一个重要因素。为了解决这一问题,需要开发低成本的吸附剂来去除污染水中的重金属,还原氧化石墨烯(rGO)基复合材料是有效的重金属吸附剂。本研究采用绿色快速的单步加热工艺制备rGO和rGO/ZnO复合材料,避免了使用任何有毒试剂。由蔗糖和乙酸锌合成的氧化石墨烯/氧化锌复合材料对六价铬(Cr(VI))具有显著的吸附能力。研究了不同吸附剂、接触时间、初始pH和浓度对Cr的吸附作用。复合材料的吸附效率是纯还原氧化石墨烯的5倍。通过Zeta电位测量、BET、EDX和XPS分析,确定了Cr(VI)在吸附剂上的吸附机理为静电相互作用、络合、孔隙填充和还原。这些研究表明,氧化石墨烯/氧化锌复合材料作为一种经济高效的吸附剂,具有很强的去除工业废水中Cr(VI)污染物的潜力。
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CiteScore
8.10
自引率
1.60%
发文量
128
审稿时长
66 days
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