摘要
采用批吸附实验方法讨论了不同pH和离子强度下四环素在氢氧化铝上的吸附行为.结果表明,四环素的吸附行为可用Freundlich等温方程描述,且在氢氧化铝上的吸附以配位反应为主.在pH 4-10的范围内,随溶液pH增大,四环素在氢氧化铝上的吸附量先增加,后在pH 5.5-8.5经历一个相对平稳的吸附段,最后减少;四环素浓度较低时,改变溶液中NaCl的浓度,其在氢氧化铝上的吸附量没有明显变化,而高浓度时,增大溶液中Na^＋的浓度,吸附量逐渐减小,同时配合物的生成促进了氢氧化铝的溶解.
The adsorption of tetracycline（TC） onto aluminum hydroxide（HAO）at different pH and ionic strength has been investigated by batch sorption experiments.The results show that the adsorption of TC on HAO can be described by Freundlich isotherms and a complex reaction is involved in the adsorption process.In pH 4～10,adsorption of TC on HAO increases with increasing pH at begin,and then reaches a relatively stable maximum in pH 5.5～8.5,above which,it decreases gently.The presence of sodium ion can weaken the adsorption of TC under a higher concentration of TC. At the same time, the formation of the complex between TC and aluminum increases the solubility of HAO in solution.
出处
《西北师范大学学报（自然科学版）》
CAS
北大核心
2009年第6期72-76,共5页
Journal of Northwest Normal University(Natural Science)
基金
甘肃省中青年科技计划基金资助项目(0711RJYA010)
关键词
四环素
氢氧化铝
吸附
配位增溶
tetracycline
aluminum hydroxide
adsorption
ligand-promoted dissolution
