Du Gang, Ding Yarong, Li Canhua, Zhang Lanyue, Li Jiamao, Li Minghui, Zhu Weichang, He Chuan
College of Metallurgical Engineering, Anhui University of Technology, Maanshan 243032, China.
Anhui Key Laboratory of Low Carbon Metallurgy and Solid Waste Resource Utilization, Anhui University of Technology, Maanshan 243002, China.
Materials (Basel). 2024 Aug 30;17(17):4306. doi: 10.3390/ma17174306.
In this study, we prepared a low-cost novel Cu/CuO/BC nanocomposite visible-light photocatalyst by the impregnation method using CuSO·5HO and rice husk biochar (BC) as raw materials and NaSO as a single reductant to improve the stability and dispersion of the Cu/CuO nanoparticles, in order to solve their aggregation tendency during photocatalysis. The morphology and structure of the Cu/CuO/BC were characterized using various analytical and spectroscopic techniques. The photocatalytic effect and cyclic stability of the synthesized photocatalyst on methyl orange (MO) removal were investigated under visible light radiation and various parameter conditions, including the mass ratio of BC to Cu/CuO, initial MO concentration, pH, temperature, and catalyst dosage. The results show that the synthesized Cu/CuO/BC nanocomposite composed of Cu/CuO spherical particles was loaded on the BC carrier, which has better stability and dispersion. The best adsorption-photocatalytic effect of the Cu/CuO/BC is exhibited when the mass ratio of BC to Cu/CuO is 0.2. A total of 100 mg of Cu/CuO/BC can remove 95% of the MO and 88.26% of the COD in the aqueous solution at pH = 6, T = 25 °C, and an initial MO concentration of 100 mg/L. After five cycles of degradation, the MO degradation rate in the sample can still remain at 78.41%. Both the quasi-secondary kinetic model and the Langmuir isothermal adsorption model describe the adsorption process. Additionally, the thermodynamic analysis demonstrates that the photocatalytic process follows the quasi-primary kinetic model and that the removal process is of spontaneous heat absorption. The photocatalyst described in this paper offers a cost-effective, easily prepared, and visible-light-responsive solution for water pollution treatment.
在本研究中，我们以硫酸铜·5水合物和稻壳生物炭（BC）为原料，亚硫酸钠为单一还原剂，采用浸渍法制备了一种低成本的新型Cu/CuO/BC纳米复合可见光光催化剂，以提高Cu/CuO纳米颗粒的稳定性和分散性，解决其在光催化过程中的团聚倾向。利用各种分析和光谱技术对Cu/CuO/BC的形貌和结构进行了表征。在可见光辐射以及各种参数条件下，包括BC与Cu/CuO的质量比、甲基橙（MO）初始浓度、pH值、温度和催化剂用量，研究了合成的光催化剂对MO去除的光催化效果和循环稳定性。结果表明，由Cu/CuO球形颗粒组成的合成Cu/CuO/BC纳米复合材料负载在BC载体上，具有较好的稳定性和分散性。当BC与Cu/CuO的质量比为0.2时，Cu/CuO/BC表现出最佳的吸附 - 光催化效果。在pH = 6、T = 25℃、MO初始浓度为100 mg/L的条件下，100 mg的Cu/CuO/BC总共可以去除水溶液中95%的MO和88.26%的化学需氧量（COD）。经过五个降解循环后，样品中MO的降解率仍可保持在78.41%。准二级动力学模型和朗缪尔等温吸附模型均能描述吸附过程。此外，热力学分析表明光催化过程遵循准一级动力学模型，且去除过程是自发吸热的。本文所述的光催化剂为水污染处理提供了一种经济高效、易于制备且可见光响应的解决方案。
