化工学报2011，Vol.62Issue(11)：3192-3200,9.DOI:10.3969/j.issn.0438-1157.2011.11.031
EGDE交联的载镧壳聚糖微球对氟离子的静态和动态吸附
Static and dynamic adsorption of fluoride using La( Ⅲ )-loaded chitosan beads crosslinked with EGDE
孟范平 1李永富 1周游 1杜秀萍1
作者信息
- 1. 中国海洋大学海洋环境与生态教育部重点实验室,山东青岛266100
- 折叠
摘要
Abstract
A new absorbent for the removal of fluoride from drinking water was prepared by using lanthanum loaded chitosan beads crosslinked with ethylene glycol diglycidyl ether (EGDE) replacing glutaraldehyde (GLA). Static and dynamic adsorption of fluoride onto absorbents (CEB-La) was investigated, respectively. The effects of various physico-chemical parameters were studied. The results of static experiment showed that the optimal adsorption conditions were pH7. 0, water temperature 50°C, contact time 60 min, and oscillation frequency 120 r · min-1. Treating the water containing F- of 10 mg ? L-1 with CEB-La under this condition, the defluoridation rate was up to 92.9% and the residual concentration of F- was 0. 71 mg · L-1, lower than 1. 0 mg · L-1. Furthermore, the adsorption isotherm could be described by the Langmuir and Freundlich models and the maximum adsorption capacity for F~ was 25. 7 mg · g-1. Sorption dynamics study revealed that the pseudo-second-order equation was suitable to describe the kinetics process of fluoride ions sorption onto the adsorbent. The used adsorbents could be regenerated by chelating with lanthanum after soaking in 0. 5 mol · L-1 of sodium hydroxide for 6 h. The removal efficiencies of F- were related to the co-existing anions. In particular, the presence ofCO32- and HCO-3 led to a markedly decreased adsorption capacity of CEB-La for F- . The results of dynamic experiment demonstrated that CEB-La was suitable for treating drinking water containing F- of 2-15 mg · L-1 when the volumetric flow rate was 3 ml · min-1. Column kinetics were described by the Thomas model and the dynamic adsorption capacity was 3. 67 mg · g-1 . Therefore, the absorbent is easy to regenerate, of low-cost, and has superior defluoridation properties, showing that it is a potential material for F- removal in practice.关键词
壳聚糖/乙二醇二缩水甘油醚/静态吸附/动态吸附Key words
chitosan/ethylene glycol diglycidyl ether/static adsorption/dynamic adsorption分类
化学化工引用本文复制引用
孟范平,李永富,周游,杜秀萍..EGDE交联的载镧壳聚糖微球对氟离子的静态和动态吸附[J].化工学报,2011,62(11):3192-3200,9.
