| 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) | |
| 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 | |
| 摘要点击次数: 1929 | |
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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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