胺基化杂化微球对溶液中Cu(Ⅱ)和Pb(Ⅱ)的吸附

Adsorption of Cu(Ⅱ) and Pb(Ⅱ) in Solution of Aminated Hybrid Microspheres

通过蒸馏共沉淀聚合反应和酰胺反应制备胺基功能化核-壳型有机/无机杂化二氧化硅微球P(DETA-co-EGDMA)/SiO2,该杂化微球无机内核直径约为400 nm,有机高分子外壳厚度约为33 nm.元素分析表明胺基化杂化微球上N元素的含量为2.91%.将所制备的胺基化杂化微球用于吸附污水中Cu(Ⅱ)和Pb(Ⅱ).结果表明:胺基化杂化微球较甲基丙烯酸化杂化微球P(MAA-co-EGDMA)/SiO2和未改性SiO2微球对Cu(Ⅱ)和Pb(Ⅱ)有更好的吸附性能;吸附过程符合Langmuir等温吸附模型,在298 K时对Cu(Ⅱ)和Pb(Ⅱ)的最大吸附容量分别为45.50 mg/g和70.75 mg/g;吸附动力学行为符合准二级动力学模型;三次脱附再生实验后胺基化杂化微球仍具有良好的再生率.

The aminated core-shell organic-inorganic hybrid silica microspheres P（DETA-co-EGDMA）/SiO2 were prepared by distillation precipitation polymerization and amide reaction. The diameter of hybrid microspheres inorganic core was ca. 400 nm and the thickness of organic polymer shell was ca. 33 nm. The aminated hybrid microspheres were characterized by elemental analysis and it was found that N element content of microspheres was 2.91%. The adsorption behaviors of aminated hybrid microspheres on heavy metal ions Cu （II） and Pb（II） were investigated, which showed that aminated hybrid microspheres exhibited larger adsorption capacities than methacrylic acid hybrid microspheres P （MAA-co-EGDMA）/SiO2 and unmodified silica microspheres. The adsorption isotherm of aminated hybrid microspheres followed the Langmuir model and the maximum adsorption capacities of aminated hybrid microspheres was 45.50 mg/g for Cu（II） and 70.75 mg/g for Pb（II） at 298 K, respectively. The adsorption kinetics were consistent with pseudo-second order model. The aminated hybrid microspheres still maintained excellent regeneration ratios through thrice desorption and regeneration experiment.