Citation: DU Yu-Cheng, LI Sheng-Hui, GU Heng-Xue, LI Yang, WU Jun-Shu, JIN Cui-Xin. Mercapto/Carboxyl Modified Diatomite: Adsorption Properties to Pb(Ⅱ) and Cd(Ⅱ)[J]. Chinese Journal of Inorganic Chemistry, ;2021, 37(1): 65-73. doi: 10.11862/CJIC.2021.025 shu

Mercapto/Carboxyl Modified Diatomite: Adsorption Properties to Pb(Ⅱ) and Cd(Ⅱ)

Faculty of Materials and Manufacturing, Ministry of Education, Beijing University of Technology, Beijing 100124, China

Corresponding author: DU Yu-Cheng, ychengdu@bjut.edu.cn WU Jun-Shu, junshuwu@bjut.edu.cn
Received Date: 25 June 2020
Revised Date: 27 October 2020

Figures(8)

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.
- diatomite,
- mercapto,
- carboxyl,
- lead(Ⅱ) ion,
- cadmium(Ⅱ) ion,
- adsorbent
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