Modification of palygorskite surface by organofunctionalization for application in immobilization of H3PW12O40
Modification of palygorskite surface by organofunctionalization for application in immobilization of H3PW12O40
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DOI：
10.1016/j.apsusc.2010.03.073
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发表时间：
2010-08
影响因子：
6.7
通讯作者：
Lixia Zhang;Qingzhe Jin;Jianhua Huang;Yuanfa Liu;L. Shan;Xingguo Wang
中科院分区：
文献类型：
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作者：
Lixia Zhang;Qingzhe Jin;Jianhua Huang;Yuanfa Liu;L. Shan;Xingguo Wang
使用 3-氨基丙基三乙氧基硅烷 (KH550) 和 N-(2-氨基乙基)-3-氨基丙基三甲氧基硅烷 (KH792) 改性坡缕石作为吸附剂载体来吸附 12-磷钨酸 (H3PW12O40, HPW)。研究了吸附剂用量、接触时间、HPW 初始浓度和温度等因素的影响。在所有研究温度下，实验数据都很好地符合准二级动力学模型和Langmuir吸附等温线模型。采用傅里叶变换红外光谱（FTIR）、X射线光电子能谱（XPS）、热重分析-同步差热分析（TGA-SDTA）和漫反射红外傅里叶变换（DRIFT）光谱分析技术对固体的物理化学性质进行了表征。特征结果表明，硅烷化-Pa是一种适合吸附HPW的载体； HPW精细有效地分布在甲硅烷基化的Pa上，并保留了部分强的布朗斯台德酸性。
Modified palygorskite with 3-aminopropyltriethoxysilane (KH550) and N-(2-aminoethyl)-3-aminopropyltrimethoxysilane (KH792) were used as adsorbent supports for adsorption of 12-phosphotungstic acid (H3PW12O40, HPW). The effect of some factors, such as adsorbent dosage, contact time, initial HPW concentration and temperature, was investigated. The experimental data were well fitted with the pseudo-second-order kinetic model and the Langmuir adsorption isotherm model at all studied temperatures. The physicochemical properties of the solids were characterized by using Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), thermogravimetric analysis–simultaneous differential thermal analysis (TGA–SDTA), and diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy analysis techniques. The characteristic results indicated that silylated-Pa was a suitable support for adsorption of HPW; and HPW was finely and effectively distributed on silylated-Pa and retained partly strong Bronsted acidity.