纳米氧化铝改性凝胶球对四环素吸附性能分析

采用溶胶-凝胶法制备纳米氧化铝改性聚乙烯醇-海藻酸钙凝胶球（SA-PVA-AlNPs），用于吸附去除水溶液中的四环素。考察了纳米氧化铝负载量、初始溶液pH、离子强度对凝胶球吸附性能的影响。结果表明:复合纳米氧化铝有利于提高凝胶球的吸附性能；SA-PVA-ALNPs吸附四环素最佳pH值条件为pH=3；NaCl浓度的提高并未显著影响凝胶球对于四环素的吸附能力。准二级动力学可以较好地拟合SA-PVA-ALNPs对四环素吸附的动力学数据；Langmuir模型能更好地拟合等温吸附数据，最大吸附容量为75.90 mg/g。SA-PVA-ALNPs吸附四环素主要依靠阳离子架桥作用、n-π电子供体-受体相互作用以及氢键作用。

ADSORPTION PERFORMANCE OF TETRACYCLINE ONTO NANO-ALUMINA MODIFIED GEL BEADS

Nano-alumina modified polyvinyl alcohol-calcium alginate gel spheres (SA-PVA-AlNPs) were prepared by sol-gel method for adsorption removal of tetracycline in aqueous solution. Effects of nano-alumina dosage, initial solution pH and ionic strength on adsorption properties of gel spheres were investigated. It was beneficial to improve the adsorption properties of gel beads; the optimum pH value of SA-PVA-ALNPs adsorbed tetracycline was 3; increase of NaCl concentration didn't significantly affect the adsorption capacity of tetracycline by gel beads. Pseudo-second order model kinetics could better fit the kinetics of SA-PVA-ALNPs adsorption on tetracycline. Langmuir model could better fit the isothermal adsorption data, and the maximum adsorption capacity was 75.90 mg/g. Adsorption of tetracycline by SA-PVA-ALNPs mainly depended on cation bridging, n-π electron donor-acceptor interaction and hydrogen bonding.