In this paper, ZnO nanoparticles (NPs) having potent photocatalytic and antimicrobial activities have been synthesized by using the aloe vera plant extract. The ZnO NPs have been synthesized using (Zn(CH3COO)2·2H2O)\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$(\hbox {Zn}(\hbox {CH}_3\hbox {COO})_{2}{\cdot } 2\hbox {H}_{2}\hbox {O})$$\end{document} (5, 10 and 50mmolkg-1\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$50\,\hbox {mmol}\, \hbox {kg}^{-1}$$\end{document}), at temperature 70∘C\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$70{^{\circ }}\hbox {C}$$\end{document} and pH 11.5. The synthesized NPs were examined using UV–Visible, X-ray diffraction, scanning electron microscopy, energy dispersive X-ray spectroscopy and transmission electron microscopy (TEM) characterization techniques. TEM analysis confirms the synthesis of ZnO NPs with hexagonal, spherical, cylindrical and cuboidal shapes decorated under different concentrations of precursor metal salt. UV–Visible studies revealed that ZnO NPs have a wide energy band gap varying from 3.36 to 3.43 eV. The synthesized ZnO NPs were examined for the photocatalytic degradation of methyl orange dye which resulted in up to 95% degradation. ZnO NPs are also inspected for the antibacterial activity against Bacillus subtilis (MTCC 441), Staphylococcus aureus (MTCC 737) and Escherichia coli (MTCC 739) pathogenic bacteria.

中文翻译：

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ZnO 纳米颗粒的形状和尺寸对其抗菌和光催化活性的影响：一种绿色方法

在本文中，利用芦荟植物提取物合成了具有强光催化和抗菌活性的 ZnO 纳米粒子 (NPs)。已使用 (Zn(CH3COO)2·2H2O)\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \ 合成 ZnO NPs usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$(\hbox {Zn}(\hbox {CH}_3\hbox {COO})_{2}{ \cdot } 2\hbox {H}_{2}\hbox {O})$$\end{document} (5, 10 and 50mmolkg-1\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{ wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$50\,\hbox {mmol }\, \hbox {kg}^{-1}$$\end{document}), 在温度 70∘C\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength {\oddsidemargin}{-69pt} \begin{document}$$70{^{\circ }}\hbox {C}$$\end{document} 和 pH 11.5。使用紫外-可见光、X 射线衍射、扫描电子显微镜、能量色散 X 射线光谱和透射电子显微镜 (TEM) 表征技术检查合成的 NP。TEM 分析证实了在不同浓度的前体金属盐下装饰的六边形、球形、圆柱形和立方形 ZnO NPs 的合成。紫外-可见研究表明，ZnO NPs 具有从 3.36 到 3.43 eV 的宽能带隙。检查合成的 ZnO NPs 对甲基橙染料的光催化降解，降解率高达 95%。还检查了 ZnO NPs 对枯草芽孢杆菌 (MTCC 441)、金黄色葡萄球菌 (MTCC 737) 和大肠杆菌 (MTCC 739) 致病菌的抗菌活性。