摘要
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。
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-πelectron donor-acceptor interaction and hydrogen bonding.
作者
廖权
骆华勇
荣宏伟
陈炳伟
梁莹
LIAO Quan;LUO Hua-yong;RONG Hong-wei;CHEN Bing-wei;LIANG Ying(College of Civil Engineering,Guangzhou University,Guangzhou 510006,China)
出处
《环境工程》
CAS
CSCD
北大核心
2020年第9期36-42,共7页
Environmental Engineering
基金
国家自然科学基金(51778155,51608133)
广东省自然科学基金(2017A030313310)
广州大学新进“优秀青年博士”培养计划项目(YB201718)。
关键词
聚乙烯醇
海藻酸钠
纳米氧化铝
吸附
四环素
polyvinyl alcohol
sodium alginate
nano-alumina
adsorption
tetracycline
