Preparation of nano-SiO2 particle surface-grafted copolymer microspheres and its adsorption performance for Cu2+
Nano-SiO2 was modified by KH570,which was used as the stabilizer of Pickering emulsion;SiO2@Acrylamide(AM)-acrylic acid(AA)copolymer composite microspheres were prepared by inverse phase(Pickering)emulsion polymerization.The structure,morphology,and mass loss of the prepared composite microspheres and nano-SiO2 before and after modification were characterized.The effects of pH,temperature and monomer ratio on the adsorption of Cu2+by composite microspheres were studied,and the kinetics and isothermo of the adsorption process were fitted at the same time.The results showed that the modified nano-SiO2 had enhanced lipophilicity and improved the ability to stabilize the emulsion;the Cu2+adsorption experiment showed that the optimum pH value for the adsorption of composite micro-spheres was 6,and the adsorption amount increased with the increase of AA dosage.The fitting results of the adsorption process of Cu2+by the spheres showed that they fit the pseudo-second-order kinetic model and the Langmuir model.
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