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.
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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.
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