巯基/羧基修饰硅藻土及其对Pb(Ⅱ)、Cd(Ⅱ)的吸附性能
Mercapto/Carboxyl Modified Diatomite: Adsorption Properties to Pb(Ⅱ) and Cd(Ⅱ)
作者单位E-mail
杜玉成 北京工业大学材料与制造学部, 北京 100124 ychengdu@bjut.edu.cn 
李生辉 北京工业大学材料与制造学部, 北京 100124  
谷恒学 北京工业大学材料与制造学部, 北京 100124  
李杨 北京工业大学材料与制造学部, 北京 100124  
吴俊书 北京工业大学材料与制造学部, 北京 100124 junshuwu@bjut.edu.cn 
靳翠鑫 北京工业大学材料与制造学部, 北京 100124  
摘要: 以3-巯基丙基三甲氧基硅烷(MPTS)、3-氨基丙基三乙氧基硅烷(APTES)、柠檬酸(CA)为原料,采用水浴法、水浴/低温水热法,分别制备了巯基(—SH)、氨基/羧基(—NH2/—COOH)表面修饰的硅藻土。采用傅里叶变换红外光谱、扫描电子显微镜、氮气吸附-脱附测试、热重/差示扫描量热法、X射线光电子能谱等技术对样品进行了表征,并探讨分析了样品制备机理。当重金属离子溶液pH=7,吸附时间为4 h时,以MPTS制备的巯基修饰硅藻土吸附剂对Pb(Ⅱ)、Cd(Ⅱ)的最大吸附容量分别为396、365 mg·g-1;以APTES、CA制备的氨基/羧基缩合修饰硅藻土吸附剂对Pb(Ⅱ)、Cd(Ⅱ)最大吸附容量分别为485、462 mg·g-1
关键词: 硅藻土  巯基  羧基  铅离子  镉离子  吸附
基金项目: 国家重点研发计划项目(No.2017YFB0310804)和宁夏回族自治区重点研发计划项目(No.2019BFG02032)资助。
Abstract: Using 3-mercaptopropyl trimethoxysilane(MPTS), 3-aminopropyl triethoxysilane(APTES) and citric acid (CA) as raw materials, the surface modified diatomite with mercapto (-SH) and amino/carboxyl (-NH2/-COOH) was prepared by water bath method and water bath/low temperature hydrothermal method, respectively. The samples were characterized by Fourier transform infrared spectroscopy, scanning electron microscope, N2 adsorption-desorption measurement, thermogravimetric analysis/differential scanning calorimetry, X-ray photoelectron spectroscopy and other technologies, and the preparation mechanism was discussed. When the pH value of heavy metal ion solution was 7 and the adsorption time was 4 h, the diatomite sample modified by MPTS showed the maximum adsorption capacities of 396 and 365 mg·g-1 towards Pb(Ⅱ) and Cd(Ⅱ), respectively, and the diatomite sample modified by APTES and CA showed the maximum adsorption capacities of 485 and 462 mg·g-1 towards Pb(Ⅱ) and Cd(Ⅱ), respectively.
Keywords: diatomite  mercapto  carboxyl  lead(Ⅱ) ion  cadmium(Ⅱ) ion  adsorbent
投稿时间:2020-06-25 修订日期:2020-10-27
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杜玉成,李生辉,谷恒学,李杨,吴俊书,靳翠鑫.巯基/羧基修饰硅藻土及其对Pb(Ⅱ)、Cd(Ⅱ)的吸附性能[J].无机化学学报,2021,37(1):65-73.
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