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中文摘要：
通过原位沉淀法合成埃洛石-四氧化三铁（HNTs-Fe_3O_4）,分别采用4种不同的硅烷偶联剂对其进行表面改性制备4种不同的吸附剂,对KH-108改性后的材料进行了结构表征,并对其在不同影响因素下对水溶液中5价锑的吸附效果进行了研究。结果表明,埃洛石已经被成功改性,其中3-哌嗪基丙基甲基二甲氧基硅烷（KH-108）改性的HNTs/Fe_3O_4对水体中的Sb~（5＋）具有最好的吸附效果。优化吸附p H为3,该吸附过程可以用准2级动力学和Langmuir方程进行很好的拟合,主要吸附机理是Sb~（5＋）在吸附剂表面形成了内层络合物。
英文摘要：
The nanocomposite HNTs-Fe3O4 was prepared by situ precipitation, and used 4 kinds silane coupling agents to modified the surface of HNTs- Fe3O4 to form 4 kinds adsorbents. Then the structure of HNTs-Fe3O4 composites which modified by KH-108 was characterized, and the effects of different influence factors on Sb5＋ absorption efficiency.in water were researched. The results indicated that KH-108 was successfully grafted onto the halloysite （KH-108） modified HNTs-Fe3O4 composites （m-HNTs-Fe3O4） exhibited the best adsorption capacity for Sb5＋. The results showed that the optimum pH.was found to be 3, and the pseudo-second-order and Freundlich isotherm model were fitted to the experimental data significantly better. The main adsorption mechanism was considered to inner-sphere complexes might be formed on the adsorbent＇s surface.
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