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Zr/Ti柱撑蒙脱石的制备及对硝基苯的吸附
作者:庹必阳1 2 3  森1 赵徐霞1  祥1  李1 
单位:(1. 贵州大学矿业学院 贵阳 550025 2. 贵州省非金属矿产资源综合利用重点试验室 贵阳 550025  3. 喀斯特地区优势矿产资源高效利用国家地方联合工程试验室 贵阳550025) 
关键词:锆/钛柱撑蒙脱石 制备 吸附 硝基苯 
分类号:TB321
出版年,卷(期):页码:2019,47(4):0-0
DOI:
摘要:

 为了解决硝基苯的水体污染问题,将锆/钛聚合羟基阳离子插入到钠基蒙脱石(Na-MMT)层间,制备锆/钛柱撑蒙脱石(Zr/Ti-MMT)材料,并用于吸附废水中硝基苯。用X射线衍射、Fourier红外光谱仪及比表面积测量对Zr/Ti-MMT材料进行表征,并考察了Zr/Ti-MMT材料对废水中硝基苯的吸附效果。结果表明:Zr/Ti-MMT主要以窄缝型介孔和微孔为主,晶面间距d(001)为3.29 nm,比表面积为115.4 m2/g,平均孔径为4.35 nm。当Zr/Ti-MMT用量为0.1 g、硝基苯初始浓度为40 mg/L、温度为45 ℃,硝基苯去除率最高,吸附量(qe)和去除率分别为17.59 mg/g 和87.94%。Zr/Ti-MMT对硝基苯的吸附过程以物理吸附方式为主,符合Langmuir等温线模型。Zr/Ti-MMT材料吸附硝基苯属于自发的吸热熵增的过程,符合一级动力学。

 Zirconium/titanium-pillared montmorillonite (Zr/Ti-MMT) was prepared via inserting zirconium/titanium polyhydroxy cations into the interlayer spaces of Na-montmorillonite (Na-MMT) as an adsorbent for adsorption of nitrobenzene in wastewater. Zr/Ti-MMT was characterized by X-ray diffraction, Fourier transform infrared spectroscopy, and specific surface area measurement. The adsorption performance of Zr/Ti-MMT on nitrobenzene in wastewater was investigated. The results show that Zr/Ti-MMT mainly consists of narrow mesopores and micropores, the interplanar spacing (d(001)) is 3.29 nm, the specific surface area is 115.4 m2/g and the average pore size is 4.35 nm. The removal rate of nitrobenzene reaches the maximum value, the adsorption quantity (qe) and removal rate are 17.59 mg/g and 87.94%, respectively, when Zr/Ti-MMT is 0.1 g, the initial concentration of nitrobenzene is 40 mg/L and the adsorption temperature is 45 ℃. It is indicated that the adsorption by Zr/Ti-MMT belongs to a physical adsorption, and follows the Langmuir isothermal model. The adsorption of Zr/Ti-MMT on nitrobenzene is a spontaneous process of heat absorption and entropy increase, and the adsorption process fits the first-order kinetic model.

基金项目:
国家自然科学基金项目(51464007);贵州省科技厅联合基金项目(黔科合LH字[2015]7684)。
作者简介:
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