Department of Biotechnology, Yeungnam University, Gyeongsan, 712-749, Republic of Korea.
School of Chemical Engineering, Yeungnam University, Gyeongsan, 712-749, Republic of Korea.
Photochem Photobiol Sci. 2022 Aug;21(8):1357-1370. doi: 10.1007/s43630-022-00224-0. Epub 2022 Apr 22.
In the current study, the photocatalytic activity of bimetallic ZnO-CuO hetero-nanocomposite was evaluated and compared with the monometallic ZnO and CuO nanoparticles using 4-nitroaniline (4-NA) and methyl orange (MO). Bimetallic ZnO-CuO hetero-nanocomposite, ZnO, and CuO nanostructure were synthesized utilizing leaf extract of Aegle marmelos and characterized by transmission electron microscopy, X-ray diffraction, and XPS. Benefiting from the p-n heterostructures formation, bimetallic ZnO-CuO hetero-nanocomposite exhibits an excellent photocatalytic activity against 4-NA as well as MO compared to pure ZnO and CuO. In particular, bimetallic ZnO-CuO hetero-nanocomposite expressed the highest photocatalytic activity by reducing 90% of 4-NA in 20 min and by degrading 96% of MO in 10 min, whereas 65% reduction of 4-NA in 30 min and 93% degradation of MO in 45 min was exhibited by CuO and 48% reduction of 4-NA in 30 min and 98% degradation of MO in 50 min was exhibited by ZnO. Moreover, bimetallic ZnO-CuO hetero-nanocomposite maintains excellent photocatalytic activity even after five cycles indicating its stability as photocatalyst and reusability. Based on the experimental findings, bimetallic ZnO-CuO hetero-nanocomposite could be used as a photocatalyst for wastewater treatment with excellent regeneration efficiency.
在当前的研究中，评估了双金属 ZnO-CuO 异质纳米复合材料的光催化活性，并将其与单金属 ZnO 和 CuO 纳米粒子使用 4-硝基苯胺（4-NA）和甲基橙（MO）进行了比较。使用 Aegle marmelos 的叶提取物合成了双金属 ZnO-CuO 异质纳米复合材料、ZnO 和 CuO 纳米结构，并通过透射电子显微镜、X 射线衍射和 XPS 进行了表征。由于形成了 p-n 异质结构，双金属 ZnO-CuO 异质纳米复合材料表现出比纯 ZnO 和 CuO 更好的光催化活性，可有效降解 4-NA 和 MO。具体而言，双金属 ZnO-CuO 异质纳米复合材料在 20 分钟内将 4-NA 的还原率达到 90%，在 10 分钟内将 MO 的降解率达到 96%，而 CuO 在 30 分钟内将 4-NA 的还原率达到 65%，在 45 分钟内将 MO 的降解率达到 93%，ZnO 在 30 分钟内将 4-NA 的还原率达到 48%，在 50 分钟内将 MO 的降解率达到 98%。此外，双金属 ZnO-CuO 异质纳米复合材料即使经过五次循环后仍保持良好的光催化活性，表明其作为光催化剂的稳定性和可重复使用性。基于实验结果，双金属 ZnO-CuO 异质纳米复合材料可用作废水处理的光催化剂，具有优异的再生效率。
