Preparation, characterization and dye adsorption of Au nanoparticles/ZnAl layered double oxides nanocomposites

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• 作者：Yu Xin Zhang ; Xiao Dong Hao ; Min Kuang ; Han Zhao ; Zhong Quan Wen
• 关键词：Au/ZnAl-LDO nanocomposites ; Dye adsorption ; Methyl orange
• 刊名：Applied Surface Science
• 出版年：2013
• 出版时间：15 October, 2013
• 年：2013
• 卷：283
• 期：Complete
• 页码：505-512
• 全文大小：2356 K

文摘

In this work, Au/ZnAl-layer double oxides (LDO) nanocomposties were prepared through a facile calcination process of AuCl₄^? intercalated ZnAl-layered double hydroxides (LDHs) nanocomposites. The morphology and crystal structure of these nanocomposites were characterized by Scanning electron microscopy (SEM), transmission electron microscopy (TEM), powder X-ray diffraction (XRD), and N₂ sorption analysis. By tailoring the process parameter, such as calcination temperature, heating time and the component composition, the adsorption properties of methyl orange (MO) on the Au/ZnAl-LDO nanocomposites were investigated in this work. In a typical adsorption process, it was found that 0.985 mg of MO (0.01 g L^?1, 100 mL, 1 mg of MO in total) can be removed in 60 min by utilizing only 2.5 mg of Au/ZnAl-LDO (Au content, 1 % ) as adsorbents. Our adsorption data obtained from the Langmuir model also gave good values of the determination coefficient, and the saturated adsorption capacity of Au/ZnAl-LDO nanocomposites for MO was found to be 627.51 mg/g under ambient condition (e.g., room temperature, 1 atm). In principle, these hybrid nanostructures with higher adsorption abilities could be very promising adsorbents for wastewater treatment.