六方纤锌矿-ZnO 合成条件对其作为阳离子和阴离子吸附剂的特性和性能影响的实验设计建模。

Experimental Design Modeling of the Effect of Hexagonal Wurtzite-ZnO Synthesis Conditions on Its Characteristics and Performance as a Cationic and Anionic Adsorbent.

机构信息

Department of Chemistry, King Faisal University, P.O. Box 400, Alahsa 31982, Saudi Arabia.

Chemistry Department, Faculty of Science, Sohag University, Sohag 82524, Egypt.

出版信息

Molecules. 2019 Oct 28;24(21):3884. doi: 10.3390/molecules24213884.

DOI:10.3390/molecules24213884

PMID:31661919

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6864852/

Abstract

Surface composite design was used to study the effect of the ZnO synthesis conditions on its adsorption of methyl orange (MO) and methylene blue (MB). The ZnO was prepared via hydrothermal treatment under different conditions including temperature (T), precursor concentration (C), pH, and reaction time (t). Models were built using four Design expert-11 software-based responses: the point of zero charge (pHzc), MO and MB removal efficiencies (R, R), MO and MB adsorption capacities (q, q), and hydrodynamic diameter of ZnO particles (D). ZnO was characterized by X-ray diffraction (XRD), Fourier-transform infrared (FTIR) spectroscopy, UV/VIS spectroscopy, thermal gravimetric analysis (TGA), and dynamic light scattering (DLS). The formation of ZnO was confirmed by the XRD, UV, and FTIR spectra. Results showed a very high efficiency for most of the samples for adsorption of MB, and more than 90% removal efficiency was achieved by 8 samples among 33 samples. For MO, more than 90% removal efficiency was achieved by 2 samples among 33 samples. Overall, 26 of 31 samples showed higher MB adsorption capacity than that of MO. R was found to depend only on the synthesis temperature while R depends on temperature, pH, and reaction time. pHzc was found to be affected by the synthesis pH only while D depends on the synthesis pH and precursor concentration.

摘要

采用表面复合设计研究了 ZnO 合成条件对其吸附甲基橙（MO）和亚甲基蓝（MB）的影响。采用水热法在不同条件下制备 ZnO，包括温度（T）、前体浓度（C）、pH 值和反应时间（t）。使用 Design expert-11 软件中的四个响应构建模型：零电荷点（pHzc）、MO 和 MB 的去除效率（R、R）、MO 和 MB 的吸附容量（q、q）和 ZnO 颗粒的水动力直径（D）。通过 X 射线衍射（XRD）、傅里叶变换红外（FTIR）光谱、紫外/可见光谱、热重分析（TGA）和动态光散射（DLS）对 ZnO 进行了表征。XRD、UV 和 FTIR 光谱证实了 ZnO 的形成。结果表明，对于大多数样品来说，对 MB 的吸附效率非常高，在 33 个样品中有 8 个样品的去除效率超过 90%。对于 MO，在 33 个样品中有 2 个样品的去除效率超过 90%。总体而言，在 31 个样品中有 26 个样品对 MB 的吸附容量高于 MO。发现 R 仅取决于合成温度，而 R 取决于温度、pH 值和反应时间。pHzc 仅受合成 pH 值的影响，而 D 取决于合成 pH 值和前体浓度。