ABSTRACT

The photocatalytic degradation of the organic pollutants using the green synthesized catalysts is an environmentally safe approach for the wastewater treatment. In this study, ZnO and CuO nanoparticles (NPs) and ZnO/CuO nanocomposites (NCs) with various CuO weight percents were synthesized using extract of Musa acuminata fruit peel as the stablizing and capping agent. The synthesized nanomaterials were characterized by TGA/DTA, XRD, SEM, TEM, SAED, HR-TEM, UV-DRS and FTIR techniques. The degradation of methylene blue (MB) dye using the synthesized catalysts was investigated under a visible light source. XRD analysed average crystalline sizes were 24.9, 17.0 and 22.6 nm for ZnO, CuO, and ZnO/CuO nanomaterials, respectively. The SEM and TEM analysis confirms that ZnO NPs, CuO NPs, and ZnO/CuO NCs possessed the spherically shaped monoclinic structure. The bandgap energies (Eg)$\left(E_g\right)$$\left(E_g\right)$ of ZnO NPs, CuO NPs and ZnO/CuO NCs were found to be 3.25, 1.7 and 3.18 eV respectively. The FT-IR analysis confirms presence of various reducing and capping agents. The photocatalytic activities of ZnO NPs, CuO NPs, and ZnO/CuO NCs were evaluated using the degradation of MB dye under the visible light irradiation. The photocatalysts CuO, ZnO, and ZnO/CuO exhibited the degradation efficiencies of 50%, 57%, and 90%, respectively.

摘要

使用绿色合成催化剂光催化降解有机污染物是一种对环境安全的废水处理方法。在这项研究中，利用芭蕉提取物合成了具有不同 CuO 重量百分比的 ZnO 和 CuO 纳米粒子 (NPs) 以及 ZnO/CuO纳米复合材料 (NCs)果皮作为稳定剂和封盖剂。通过TGA/DTA、XRD、SEM、TEM、SAED、HR-TEM、UV-DRS和FTIR技术对合成的纳米材料进行了表征。在可见光源下研究了使用合成催化剂降解亚甲基蓝（MB）染料的情况。XRD 分析显示 ZnO、CuO 和 ZnO/CuO 纳米材料的平均晶体尺寸分别为 24.9、17.0 和 22.6 nm。SEM和TEM分析证实ZnO NPs、CuO NPs和ZnO/CuO NCs具有球形单斜结构。带隙能量（乙G）$（{乙}_G）$$\left(E_g\right)$ZnO NPs、CuO NPs 和 ZnO/CuO NCs 的电压分别为 3.25、1.7 和 3.18 eV。FT-IR 分析证实存在各种还原剂和封端剂。利用可见光照射下 MB 染料的降解来评估 ZnO NPs、CuO NPs 和 ZnO/CuO NCs 的光催化活性。光催化剂CuO、ZnO和ZnO/CuO的降解效率分别为50%、57%和90%。