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Novel ZnO/CuBi2O4 heterostructures for persulfate-assisted photocatalytic degradation of dye contaminants under visible light
Journal of Photochemistry and Photobiology A: Chemistry ( IF 4.1 ) Pub Date : 2020-01-15 , DOI: 10.1016/j.jphotochem.2020.112397
Mina Sabri , Aziz Habibi-Yangjeh , Srabanti Ghosh

New visible-light-induced photocatalysts were synthesized through a hydrothermal method, which possess excellent activation efficiency for potassium persulfate (PS) to remove water contaminants. The features of as-synthesized nanocomposites were studied by different instruments. The results showed that the binary ZnO/CuBi2O4 (5.0 %) sample has best photocatalytic capability in the elimination of methyl orange (MO), rhodamine B (RhB), and Congo red (CR). The photodegradation rate constant of RhB over the ZnO/CuBi2O4 (5.0 %) photocatalyst in the existence of 1.48 mM of PS ions, was 178 × 10−4 min−1, which is about 26.4, 5.11, 4.31, and 2.44-times as large as the pristine ZnO, PS ions, ZnO/PS, and ZnO/CuBi2O4 (5.0 %) nanocomposite, respectively. The improving photodegradation efficiency was attributed to larger surface area, high absorption of visible light, and the formation of heterojunction at the interface of ZnO and CuBi2O4 nanoparticles. In our view, this study supplies a new method for the production of effective heterojunction photocatalysts using ZnO, which could solve environmental problems according to the practical requirements.



中文翻译:

新型ZnO / CuBi 2 O 4异质结构在可见光下过硫酸盐辅助光催化降解染料污染物

通过水热法合成了可见光诱导的新型光催化剂,该催化剂对过硫酸钾(PS)具有很强的去除水污染物的活化效率。用不同的仪器研究了合成纳米复合材料的特性。结果表明,二元ZnO / CuBi 2 O 4(5.0%)样品在消除甲基橙(MO),若丹明B(RhB)和刚果红(CR)方面具有最佳的光催化能力。在存在1.48 mM PS离子的条件下,RhB在ZnO / CuBi 2 O 4(5.0%)光催化剂上的光降解速率常数为178×10 -4  min -1分别约为原始ZnO,PS离子,ZnO / PS和ZnO / CuBi 2 O 4(5.0%)纳米复合材料的26.4、5.11、4.31和2.44倍。光降解效率的提高归因于更大的表面积,对可见光的高吸收以及在ZnO和CuBi 2 O 4纳米粒子的界面处形成异质结。我们认为,这项研究提供了一种使用ZnO生产有效的异质结光催化剂的新方法,该方法可以根据实际需要解决环境问题。

更新日期:2020-01-15
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