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CuBi2O4/calcined ZnAlBi-LDHs heterojunction: Simultaneous removal of Cr(VI) and tetracycline through effective adsorption and photocatalytic redox
Journal of Cleaner Production ( IF 11.1 ) Pub Date : 2022-06-24 , DOI: 10.1016/j.jclepro.2022.132810
Jiyong Zhang , Yuhao Ma , Wentao Zhang , Xue Huang , Xiaomeng Wang , Yi Huang , Peicong Zhang

In order to solve the pollution of heavy metals and organic antibiotic in the water environment, a novel CuBi2O4/calcined ZnAlBi layered double hydroxides (CBO/CLDHs) composite was constructed and prepared via an ultrasonic-assisted calcination method for the adsorption and photocatalysis synergetic effect. Through varying the composition ratio, pH value, initial pollutant concentration and other pollutant interference, the simultaneous removal ability including adsorption and photocatalysis of as-prepared CBO/CLDHs composites for Cr(VI) and tetracycline pollutants was discussed. In particular, the CBO/CLDHs-1/15 composite showed that the removal efficiencies of Cr(VI) (40 mg/L) and tetracycline (40 mg/L) were both above 95%. Meanwhile, the XPS results confirmed that the toxic Cr(VI) was gradually reduced to non-toxic Cr(III) under visible light irradiation. The enhanced adsorption and photocatalytic activity was mainly attributed to the uniform distribution of calcined ZnAlBi layered double hydroxides nanosheets on the CuBi2O4 microrods and the formation of heterojunctions. Moreover, cycle performance results revealed that the CBO/CLDHs-1/15 composite maintained high removal activity and stable structure after 4 photocatalytic cycles, and even showed a good adaptability while applied to the actual water in production and living environments. These results exhibited that the as-prepared CBO/CLDHs-1/15 composite has excellent adsorption and photocatalytic ability for the simultaneous removal of Cr(VI) and tetracycline, with a great potential application in practical waste water treatment field.



中文翻译:

CuBi2O4/煅烧 ZnAlBi-LDHs 异质结:通过有效吸附和光催化氧化还原同时去除 Cr(VI) 和四环素

为解决水环境中重金属和有机抗生素的污染问题,采用超声辅助煅烧法构建并制备了一种新型CuBi 2 O 4 /煅烧ZnAlBi层状双氢氧化物(CBO/CLDHs)复合材料,用于吸附和光催化协同效应。通过改变成分比、pH值、初始污染物浓度和其他污染物干扰,制备的CBO/CLDHs复合材料对Cr(VI)和四环素的吸附和光催化同时去除能力污染物进行了讨论。特别是 CBO/CLDHs-1/15 复合材料表明 Cr(VI) (40 mg/L) 和四环素 (40 mg/L) 的去除效率均在 95% 以上。同时,XPS结果证实有毒的Cr(VI)在可见光照射下逐渐还原为无毒的Cr(III)。增强的吸附和光催化活性主要归因于煅烧 ZnAlBi 层状双氢氧化物纳米片在 CuBi2O4和异质结的形成. 此外,循环性能结果表明,CBO/CLDHs-1/15复合材料在4次光催化循环后仍保持较高的去除活性和稳定的结构,甚至在实际生产生活用水中表现出良好的适应性。这些结果表明,所制备的CBO/CLDHs-1/15复合材料对同时去除Cr(VI)和四环素具有优异的吸附和光催化能力,在实际废水处理领域具有很大的应用潜力。

更新日期:2022-06-28
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