氨基化硅藻基As(Ⅴ)印迹复合材料的制备与性能
Preparation and Properties of Aminated Diatom-Based As(Ⅴ) Imprinted Composites
作者单位E-mail
梁效铭 桂林理工大学材料科学与工程学院, 桂林 541004  
钟溢健 桂林理工大学环境科学与工程学院, 桂林 541004  
马丽丽 桂林理工大学环境科学与工程学院, 桂林 541004  
李聪 桂林理工大学环境科学与工程学院, 桂林 541004  
杨勤桃 桂林理工大学环境科学与工程学院, 桂林 541004  
陈南春 桂林理工大学材料科学与工程学院, 桂林 541004 cnc@glut.edu.cn 
解庆林 桂林理工大学环境科学与工程学院, 桂林 541004  
摘要: 采用硅藻作为材料载体、选取氨基丙基三甲氧基硅烷(APS)作为功能单体、As(Ⅴ)为模板离子、环氧氯丙烷(ECH)为交联剂通过表面印迹组合,制备了砷离子印迹复合材料,并将其应用于二元体系中对砷离子的选择吸附。采用扫描电镜、X射线光电子能谱、傅立叶变换红外光谱及N2吸附-脱附实验对材料进行表征,探究了硅藻基表面印迹法的搭接方式:氨基丙基三甲氧基硅烷首先通过缩合反应脱去甲氧基,与硅藻表面的活性羟基形成了(Si-O)3≡Si-R结构,在硅藻表面形成有效接枝,通过环氧氯丙烷与APS中的氨基交联形成印迹结合位点,从而在硅藻表面形成了具有As(Ⅴ)选择性的复合印迹孔穴。采用选择性系数法,得出离子印迹复合材料对砷离子(As(Ⅴ))的去除率为98%,相对选择性系数(k')均大于1.5。
关键词: 硅藻  离子印迹  形成机理  吸附  选择性
基金项目: 国家自然科学基金(No.41662005,51564008),广西科技攻关项目(桂科攻14124004-5-5),广西中青年能力项目(No.2018KY0249)和广西环境污染控制理论与技术重点实验室研究基金资助
Abstract: An arsenic ion imprinted composite was prepared by surface imprinting. Diatom was used as a material carrier, aminopropyltrimethoxysilane (APS) was used as functional monomer, As(Ⅴ) was template ion, and epichlorohydrin (ECH) was used as crosslinking agent. The composite was used in the study of the selective adsorption of arsenic ions in a binary system. Scanning electron microscopy, X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy and N2 adsorption-desorption experiments were used to characterize the material. The lap joint method of diatom-based surface imprinting was investigated. The results showed that aminopropyltrimethoxysilane was first decarboxylated by condensation reaction, and then (Si-O)3≡Si-R was formed with the active hydroxyl group on the surface of the diatom. The Si-R structure formed an effective graft, and then crosslinked the oxychloropropane with the amino group in the APS to form a blot binding site, and finally a composite blotting hole with As(Ⅴ) selectivity was formed on the surface of the diatom. The selectivity coefficient method was used to study the results. The results showed that the removal rate of arsenic ions (As(Ⅴ)) by ion-imprinted composites was 98%, and the relative selectivity coefficient (k') was greater than 1.5.
Keywords: diatom  ion imprinting  formation mechanism  adsorption  selectivity
投稿时间:2018-11-08 修订日期:2019-03-06
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梁效铭,钟溢健,马丽丽,李聪,杨勤桃,陈南春,解庆林.氨基化硅藻基As(Ⅴ)印迹复合材料的制备与性能[J].无机化学学报,2019,35(5):828-836.
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