Vu Anh Tuan, Pham Thi Anh Tuyet, Mac Van Hung, Nguyen Thanh Hung
School of Chemical Engineering, Hanoi University of Science and Technology, Hanoi, Vietnam.
J Anal Methods Chem. 2021 Apr 10;2021:5533734. doi: 10.1155/2021/5533734. eCollection 2021.
In this study, the physical properties of ZnO were facile controlled by the synthesis method with the addition of capping and precipitation agents. As-prepared ZnO samples had different morphologies such as carnation flower-like ZnO (CF-ZnO), rose-flower-like ZnO (RF-ZnO), rod-like ZnO (R-ZnO), and nanoparticle ZnO (N-ZnO) and were characterized by SEM, XRD, N adsorption/desorption isotherms, FT-IR, and DR/UV-vis. All samples had a crystallite structure of hexagonal wurtzite type. The CF-ZnO and RF-ZnO samples had the hierarchical structure like a carnation flower and a beautiful rose, respectively. R-ZnO was composed of many hexagonal rods and few spherical particles, while N-ZnO microstructures were made up of nanoparticles with approximately 20-30 nm, exhibiting the largest surface area, pore volume, and pore width among as-prepared samples, and their crystal size and bandgap energy were 17.8 nm and 3.207 eV, respectively. The catalytic performances of ZnO samples were evaluated by degradation of Tartrazine (TA) and Caffeine (CAF) under low UV irradiation (15 W). N-ZnO showed a high photocatalytic activity compared to other samples. Besides, the reaction kinetics was investigated by the first-order kinetic model, and the catalytic performance of ZnO was evaluated through several organic pollutants.
在本研究中，通过添加封端剂和沉淀剂的合成方法，可轻松控制氧化锌（ZnO）的物理性质。所制备的ZnO样品具有不同的形貌，如康乃馨花状ZnO（CF-ZnO）、玫瑰花朵状ZnO（RF-ZnO）、棒状ZnO（R-ZnO）和纳米颗粒ZnO（N-ZnO），并通过扫描电子显微镜（SEM）、X射线衍射（XRD）、N吸附/脱附等温线、傅里叶变换红外光谱（FT-IR）和漫反射/紫外-可见光谱（DR/UV-vis）进行了表征。所有样品均具有六方纤锌矿型微晶结构。CF-ZnO和RF-ZnO样品分别具有类似康乃馨花和美丽玫瑰的分级结构。R-ZnO由许多六方棒和少量球形颗粒组成，而N-ZnO微观结构由约20-30nm的纳米颗粒组成，在所制备的样品中表现出最大的表面积、孔体积和孔径，其晶体尺寸和带隙能量分别为17.8nm和3.207eV。通过在低紫外光照射（15W）下对柠檬黄（TA）和咖啡因（CAF）的降解来评估ZnO样品的催化性能。与其他样品相比，N-ZnO表现出较高的光催化活性。此外，通过一级动力学模型研究了反应动力学，并通过几种有机污染物评估了ZnO的催化性能。
