摘要
采用负载镧的乙二醇二缩水甘油醚(EGDE)交联壳聚糖微球对含氟水进行吸附处理。该吸附剂的适宜工作条件为:温度30～50℃,pH值7.0,吸附时间30min。用吸附等温线描述了F-在吸附剂上的吸附平衡,并用动力学模型研究了其吸附动力学机制。结果表明:吸附剂对F-的吸附平衡符合Langmuir吸附等温线和Freundlich吸附等温线,饱和吸附容量为25.7mg.g-1;该吸附剂对F-的吸附既包含化学吸附又包含物理吸附过程,以单分子层的化学吸附为主;吸附动力学符合拟二级动力学方程,吸附过程受化学吸附机理的控制,颗粒内扩散和液膜形成的边界层是其限速步骤。
The water containing high fluoride ions was treated by the applicability of La（l]I）-loaded chi- tosan beads crosslinked by ethylene glycol diglycidyl ether（EGDE）. The suitable treatment conditions were. temperature was 30450 ℃, pH value was 7.0, and contact time was 30min. The adsorption equi- librium behavior was described using adsorption isotherms; and several dynamic models were adopted to interpret the adsorption dynamics mechanism. The equilibrium data fitted well both to Langmuir and Fre- undlich isotherms; the maximum adsorption capacity for F- was 25. 7 mg · g^-1. It was found that the physical adsorption and the chemical adsorption coexisted; the monomolecular layer chemical adsorption was the dominant type. Adsorption kinetics study revealed that the adsorption process followed pseudo- second-order model; the adsorption process was complex and controlled by chemical adsorption mecha- nism; both the boundary of liquid film and intraparticle diffusion contributed to the rate-determining step.
出处
《中国海洋大学学报（自然科学版）》
CAS
CSCD
北大核心
2012年第6期34-39,共6页
Periodical of Ocean University of China
基金
山东省优秀中青年科学家科研奖励基金项目(BS03124)资助
