Citation: LI Laiming, REN Fangfang, ASSEFA Aschenaki, LIU Jia, ZHANG Xiaofei, BAO Jianmin, LI Youxin. Preparation of seven kinds of amino bonded silica gels and their adsorption to heavy metal Pb²⁺[J]. Chinese Journal of Chromatography, ;2020, 38(3): 341-349. doi: 10.3724/SP.J.1123.2019.09030 shu

Preparation of seven kinds of amino bonded silica gels and their adsorption to heavy metal Pb²⁺

Tianjin Key Laboratory for Modern Drug Delivery and High-Efficiency, Collaborative Innovation Center of Chemical Science and Engineering, School of Pharmaceutical Science and Technology, Tianjin University, Tianjin 300072, China

Corresponding author: LI Youxin, lyx@tju.edu.cn
Received Date: 29 September 2019

Fund Project: National Natural Science Foundation of China (No. 21605112).

Seven kinds of amino bonded silica gels were prepared. They were aminopropyl bonded silica gel (SiO₂-N), ethylenediamine-N-propyl bonded silica gel (SiO₂-2N), diethylenetriamine bonded silica gel (SiO₂-3N), triethylenetetramine bonded silica gel (SiO₂-4N), tetraethylene pentamine bonded silica gel (SiO₂-5N), pentaethylene hexamine bonded silica gel (SiO₂-6N) and polyvinylimide bonded silica gel (SiO₂-nN). The densities of the bonded amino groups in SiO₂-N and SiO₂-2N prepared by a one-step method were up to 2.07mmol/g and 1.71mmol/g, respectively. The density of the bonded amino groups in SiO₂-nN with ethylene imine units prepared by a two-step method, was 0.02mmol/g. The densities of the bonded amino groups in the other silica gels were similar, about 0.50mmol/g. The synthesized silica gels were used to investigate the adsorption of the heavy metal ion Pb²⁺ which commonly exists in aqueous solutions. About 20 mg of the silica gel was added to 10 mL of 400 mg/L Pb²⁺, at pH 5 and 30℃. The results indicated that the adsorption capacity reached the maximum value after 10 h. The adsorption process was fit to the Freundlich isothermal equation. The adsorption capacities of SiO₂-N, SiO₂-2N, SiO₂-3N, SiO₂-4N, SiO₂-5N, SiO₂-6N and SiO₂-nN to Pb²⁺were 131.28, 138.98, 85.37, 75.22, 61.87, 79.12 and 114.06 mg/g, respectively, indicating the potential utility of these amino-functionalized silica gels for the adsorption of Pb²⁺.
- amino bonded silica gel,
- heavy metal removal,
- lead ion (Pb²⁺),
- adsorption capacity
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Preparation of seven kinds of amino bonded silica gels and their adsorption to heavy metal Pb²⁺