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首页> 美国卫生研究院文献>Molecules >Experimental Design Modeling of the Effect of Hexagonal Wurtzite—ZnO Synthesis Conditions on Its Characteristics and Performance as a Cationic and Anionic Adsorbent
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Experimental Design Modeling of the Effect of Hexagonal Wurtzite—ZnO Synthesis Conditions on Its Characteristics and Performance as a Cationic and Anionic Adsorbent

机译：六方纤锌矿-ZnO合成条件对其阳离子和阴离子吸附剂性能的影响的实验设计模型

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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.
机译：使用表面复合材料设计研究了ZnO合成条件对其吸附甲基橙（MO）和亚甲基蓝（MB）的影响。通过在不同条件下进行水热处理来制备ZnO，包括温度（T），前体浓度（C），pH和反应时间（t）。使用四个基于Design Expert-11软件的响应建立模型：零电荷点（pHzc），MO和MB去除效率（R，R），MO和MB吸附容量（q，q）以及ZnO的流体动力学直径粒子（D）。 ZnO的特征在于X射线衍射（XRD），傅立叶变换红外（FTIR）光谱，UV / VIS光谱，热重分析（TGA）和动态光散射（DLS）。 XRD，UV和FTIR光谱证实了ZnO的形成。结果表明，大多数样品的MB吸附效率非常高，而33个样品中的8个样品的去除率达到90％以上。对于MO，33个样品中的2个样品达到90％以上的去除效率。总体而言，在31个样品中，有26个样品的MB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和反应时间。发现pHzc仅受合成pH的影响，而D取决于合成pH和前体浓度。

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