功能化壳聚糖改性中空介孔SiO2

摘要

A composite nanoparticle hollow mesoporous SiO2(HMSiO2)@chitosan-graft-polyamidoxime(CTS-g-PAO)was prepared via HMSiO2through sol-gel method used as CTS coating on HMSiO2by inverse microemulsion synthesis used as the matrix to graft polyacrylonitrile(PAN),which was transformed to PAO.The component and the structure of the HMSiO2@CTS-g-PAO composite were examined by FTIR and XRD.The morphology and the size of the HMSiO2@CTS-g-PAO were confirmed by SEM and Laser Particle Size Analyzer.The results show that the HMSiO2@CTS-g-PAO is core-shell nanoparticle with the HMSiO2as the core and the CTS-g-PAO as the shell. K2Cr2O7solution is used as the Cr target for detecting the adsorption capacity of the prepared HMSiO2@CTS-g-PAO.The results indicate that the adsorption capacity of CrVIis 3.28 mmol/g when the pH of K2Cr2O7solution is 2 and the concentration of the solution is 9 1.4 mg/L.Furthermore,the adsorption process is consistent with the pseudo-second-order kinetics and mainly belongs to chemical adsorption.%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)沉积在 HMSiO2纳米微球表面,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 HMSiO2复合壳聚糖接枝聚偕胺肟(PAO)复合纳米粒子(HMSiO2@CTS-g-PAO).通过 FTIR 和XRD对 HMSiO2@CTS-g-PAO复合纳米粒子的结构进行表征.采用 SEM和激光粒度分析仪对 HMSiO2@CTS-g-PAO复合纳米粒子的形貌和粒径进行探究.结果表明:HMSiO2@CTS-g-PAO 复合纳米粒子的内层为 HM-SiO2,外层为 CTS-g-PAO,是典型的核-壳纳米粒子.以 K2Cr2O7为 Cr源,探究 HMSiO2@CTS-g-PAO 复合纳米粒子对 CrⅥ的吸附.结果表明,HMSiO2@CTS-g-PAO 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、浓度为91.4 mg/L的 K2Cr2O7溶液中铬的最大吸附量高达 3.28 mmol/g.