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Citation: LI Yan-Bin, GAO Bao-Jiao, AN Fu-Qiang. Adsorption of Quaternized Polyethyleneimine-grafted Silica Gel Particles for Chromate[J]. Chinese Journal of Applied Chemistry, ;2009, 26(1): 72-77. shu

Adsorption of Quaternized Polyethyleneimine-grafted Silica Gel Particles for Chromate

1.
Department of Chemical Engineering, North University of China, Taiyuan 030051

Corresponding author: GAO Bao-Jiao,
Received Date: 3 December 2007
Available Online: 24 March 2008
Fund Project: 山西省自然科学基金资助项目(MZ20020402) (MZ20020402)

Silica gel particles on which quaternized polyethyleneimine was grafted were used in the removal of chromate anions.Polyethyleneimine(PEI) was first grafted on the surface of the silica gel particles via the coupling of γ-chloropropyl trimethoxy silane,resulting in grafting PEI/SiO₂ particles.Then,the grafted PEI was quaternized via two polymeric reactions,tertiary amine reaction and quaternization,and the functional particles QPEI/SiO₂,on which quaternized PEI was grafted,was obtained.The infrared spectrum of QPEI/SiO₂ was obtained and its chemical structure was characterized.The Zeta potential of the QPEI/SiO₂ particles was also determined.The adsorption property of QPEI/SiO₂ for chromate anions was studied with the static method.The experimental results show that the QPEI/SiO₂ particles have a very strong adsorption ability by strong electrostatic interaction,and the saturated adsorption amount can reach 0.14 g/g.The isotherm adsorption obeys Langmuir equation.The major factor which affects the adsorption property of QPEI/SiO₂ for chromate anions is the quaternization degree of QPEI/SiO₂,and the QPEI/SiO₂ particles with higher quaternization degree have a higher adsorption capacity.The pH of the medium has little effect on the adsorption property of QPEI/SiO₂.
- chromate,
- polyethyleneimine,
- quaternary ammonium salt,
- graft polymerization,
- electrostatic interaction
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