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以通过溶胶-凝胶法制备的中空介孔SiO2(HMSiO2)纳米微球为骨架材料,通过反相微乳液合成使天然高分子壳聚糖(CTS)在HMSiO2纳米微球表面沉积,随后在铈离子引发下于CTS表面进行丙烯腈接枝共聚并偕胺肟化制备中空介孔SiO2复合壳聚糖接枝聚偕胺肟HMSiO2@CTS-g-PAO复合纳米粒子。通过FTIR和XRD对HMSiO2@CTS-g-PAO的结构进行表征。采用SEM和激光粒度分析仪对HMSiO2@CTS-g-PAO的形貌、粒径进行探究。结果表明:HMSiO2@CTS-g-PAO复合纳米粒子的内层为HMSiO2,外层为壳聚糖接枝聚偕胺肟(CTS-g-PAO),是典型的核壳纳米粒子。以K2Cr2O7为铬源,探究合成的复合纳米粒子对CrVI的吸附。结果表明,复合粒子对CrVI的吸附过程符合伪二级吸附动力学,主要为化学吸附,对pH=2.0的K2Cr2O7溶液91.4mg/L中铬的最大吸附量高达3.28mmol/g。
By using hollow mesoporous SiO2 (HMSiO2) nanospheres prepared by sol-gel method as skeleton material, natural polymer chitosan (CTS) was deposited on the surface of HMSiO2 nanospheres by reverse microemulsion, CTS-g-PAO nanocomposite hollow mesoporous SiO2 composite chitosan grafted polyamidoxime HMSiO2 @ CTS-g-PAO nanoparticles were prepared by acrylonitrile graft copolymerization and amidoximation of CTS on the surface of CTS. The structure of HMSiO2 @ CTS-g-PAO was characterized by FTIR and XRD. The morphology and particle size of HMSiO2 @ CTS-g-PAO were investigated by SEM and laser particle size analyzer. The results show that the inner layer of HMSiO2 @ CTS-g-PAO composite nanoparticles is HMSiO2, and the outer layer is chitosan grafted polyamidoxime (CTS-g-PAO), which is a typical core-shell nanoparticle. K2Cr2O7 as a chromium source, to explore the synthesis of composite nanoparticles adsorption of CrVI. The results showed that the adsorption of CrVI by the composite particles accorded with the pseudo-second-order adsorption kinetics, mainly by chemisorption. The maximum adsorption capacity of chromium in 91.4mg / L K2Cr2O7 solution with pH = 2.0 was 3.28mmol / g.