Sol-gel synthesized CuO nanoparticles supported on reduced graphene oxide nanocomposite for sunlight-catalytic methylene blue degradation and nanofluid applications

IF 2.3 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS

Journal of Sol-Gel Science and Technology Pub Date : 2024-07-12 DOI:10.1007/s10971-024-06469-8

Yuvaraj Haldorai, Raju Suresh Kumar, Sivalingam Ramesh, R. T. Rajendra Kumar, Woochul Yang

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Abstract

The presence of organic dye contaminations has been a major concern in recent years. Metal oxides and their composite have created a huge interest in the degradation of organic pollutants utilizing particularly direct sunlight has been investigated recently. This study demonstrated a facile sol-gel-assisted synthesis of copper oxide (CuO) nanoparticles (NPs) dispersed on reduced graphene oxide (rGO) composite for solar light-assisted removal of methylene blue (MB) dye and nanofluids applications. Transmission electron microscopic images displayed that the CuO NPs, which had a mean diameter of 30 nm, were dispersed on the rGO surface. The composite photocatalyst demonstrated a 92% degradation rate for MB dye. In addition, the study examined the impact of photocatalyst quantity, concentration of MB, and pH on MB degradation. A study on radical scavenging demonstrated that the generation of superoxide radicals was the main factor responsible for the degradation of MB. The stability test demonstrated that the degradation efficiency of the MB did not exhibit a substantial reduction after four consecutive cycles. Furthermore, the thermal conductivity of CuO/rGO nanofluids depends on the particle concentration and temperature. The thermal conductivity enhancement of the nanofluids with a 0.07% volume fraction at 65 °C in deionized water and ethylene glycol was found to be 47.5% and 30.3%, respectively.

Graphical Abstract

Abstract Image

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在还原氧化石墨烯纳米复合材料上支撑的溶胶凝胶合成氧化铜纳米粒子在阳光下催化亚甲基蓝降解和纳米流体中的应用

近年来，有机染料污染问题一直备受关注。金属氧化物及其复合材料在利用阳光直接照射降解有机污染物方面引起了人们的极大兴趣。本研究展示了一种简单的溶胶-凝胶辅助合成氧化铜（CuO）纳米粒子（NPs）的方法，该方法将氧化铜分散在还原氧化石墨烯（rGO）复合材料上，用于太阳光辅助去除亚甲基蓝（MB）染料和纳米流体。透射电子显微镜图像显示，平均直径为 30 纳米的 CuO NPs 分散在 rGO 表面。这种复合光催化剂对 MB 染料的降解率高达 92%。此外，研究还考察了光催化剂数量、甲基溴浓度和 pH 值对甲基溴降解的影响。自由基清除研究表明，超氧自由基的产生是导致甲基溴降解的主要因素。稳定性测试表明，经过连续四个循环后，甲基溴的降解效率并未出现大幅下降。此外，CuO/rGO 纳米流体的热导率取决于颗粒浓度和温度。在 65 ℃ 的去离子水和乙二醇中，体积分数为 0.07% 的纳米流体的导热率分别提高了 47.5% 和 30.3%。

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来源期刊

Journal of Sol-Gel Science and Technology 工程技术-材料科学：硅酸盐

CiteScore

4.70

自引率

4.00%

发文量

280

审稿时长

2.1 months

期刊介绍： The primary objective of the Journal of Sol-Gel Science and Technology (JSST), the official journal of the International Sol-Gel Society, is to provide an international forum for the dissemination of scientific, technological, and general knowledge about materials processed by chemical nanotechnologies known as the "sol-gel" process. The materials of interest include gels, gel-derived glasses, ceramics in form of nano- and micro-powders, bulk, fibres, thin films and coatings as well as more recent materials such as hybrid organic-inorganic materials and composites. Such materials exhibit a wide range of optical, electronic, magnetic, chemical, environmental, and biomedical properties and functionalities. Methods for producing sol-gel-derived materials and the industrial uses of these materials are also of great interest.