摘要
用溶胶-凝胶法合成纳米羟基磷灰石(n-HAP)吸附水溶液中的氟离子(F-),考察反应时间、体系pH值和F-初始浓度等因素对吸附作用的影响,探讨吸附机理。结果表明:吸附平衡出现在反应进行120 min时,吸附速率符合拟二级动力学方程;吸附量在pH=6时达到10.55 mg/g,与初始c(F-)呈正相关关系;n-HAP是F-的有效吸附剂,对F-的吸附属Langmuir等温吸附模型。
Nano-hydroxyapatite synthesized by sol-gel method was used to remove fluoride ions from aqueous solution.The adsorption mechanism and the effect of various parameters such as adsorption time,the pH value and initial fluoride concentration on the adsorption efficiency were investigated.The research results show that the adsorption equilibrium is achieved in 120min and the adsorption kinetics can be described by pseudo-second-order reaction model;the optimal pH value is about 6 and the maximum adsorption capacity is 10.55mg/g,and the amount of adsorption increases with increasing fluoride concentration;the nano-hydroxyapatite is an effective adsorbent for fluoride and the adsorption of F-fits in Langmuir adsorption isotherm.
出处
《济南大学学报（自然科学版）》
CAS
北大核心
2011年第2期138-141,共4页
Journal of University of Jinan(Science and Technology)
基金
国家自然科学基金(20877035)
