摘要
采用负载镨的壳聚糖作为含氟水的吸附剂,其最佳制备工艺条件为:壳聚糖用量1.0 g.L-1,Pr3+浓度0.1 mol.L-1,反应时间8 h,吸附剂粒径0.1 mm.该吸附剂的最优工作条件为:pH 7.0,温度50℃,吸附时间60min.当吸附剂用量为1.60 g.L-1时,对浓度20 mg.L-1的含氟水去除率达到99.0%.用0.1 mol.L-1的NaOH对吸附饱和后的吸附剂进行解吸处理24 h,可以有效地恢复其吸附性能.吸附剂对F-的吸附过程符合Langmuir吸附等温线方程;对F-的饱和吸附容量为62.1 mg.g-1.吸附动力学符合拟二级速率方程,颗粒内扩散过程和液膜形成的边界层是吸附过程的主要限速步骤.
The applicability of chitosan modified by praseodymium as adsorbents for the removal of excess fluoride from water was studied. The optimal preparing conditions were as follows, dosage of chitosan 1.0 g·L^-1 , concentration of praseodymium 0.1 mol·L^-1, preparing time 8 h, particle size 0.1 mm. The treatment conditions optimized were as follows., pH 7.0, water temperature 50 ℃, contact time 60 min. A salt rejection against the water containing F^- of 20 mg·L^-1 was 99.0% with the adsorbent at the dosage of adsorbent was only 1.6 g·L^-1. The used adsorbents could be regenerated in 24 h by 0.1 mol·L^-1 of sodium hydroxide. The equilibrium adsorption data were fitted reasonably well for Langmuir isotherm model, and the maximum adsorption capacity for F^- was 62.1 mg·g^-1. The adsorption kinetics reveal that： the ad- sorption process follows pseudo-second-order model, the adsorption process is complex, both the boundary of liquid film and intraparticle diffusion contribute to the rate-determining step.
出处
《武汉大学学报（理学版）》
CAS
CSCD
北大核心
2008年第4期421-426,共6页
Journal of Wuhan University:Natural Science Edition
基金
山东省优秀中青年科学家科研奖励基金资助项目(BS03124)
关键词
镨
壳聚糖
脱氟
praseodymium
chitosan
defluoridation
