La(III)-loaded bentonite/chitosan beads for defluoridation from aqueous solution |
| |
引用本文: | 张艺,徐莹,崔昊,刘炳杰,高翔,汪东风,梁鹏.La(III)-loaded bentonite/chitosan beads for defluoridation from aqueous solution[J].中国稀土学报(英文版),2014,32(5):458-466. |
| |
作者姓名: | 张艺 徐莹 崔昊 刘炳杰 高翔 汪东风 梁鹏 |
| |
作者单位: | [1]College of Food Science and Engineering, Ocean University of China, Qingdao 266003, China [2]Ocean and Fishery Bureau of Lianyungang City,Lianyungang 222000, China [3]College of Food Science and Teehnology; Fujian Agriculture and Forestry University, Fuzhou 350002, China |
| |
基金项目: | Project supported by National Special Fund for Scientific Research on Public Causes (201005020), China Postdoctoral Science Foundation (2013 M531652), National Natural Science Foundation of China (31302162) |
| |
摘 要: | Developing low-cost and effective materials for excess fluoride removal is important for providing safe water. A novel ad- sorbent, La(IlI)-loaded bentonite/chitosan beads (La-BCB) was prepared for defluoridation from aqueous solution. The effects of various parameters such as dosage of La(III), pH, temperature, contact time, initial fluoride concentration and presence of co-existing anions were investigated to examine the defluoridation behavior. The maximum defluoridation capacity of La-BCB was 2.87 mg/g at pH 5, 30 ℃. Scanning electron microscopy (SEM), energy dispersive spectroscopy (EDX) and Fourier transform infrared spectros- copy (FTIR) were employed to analyze the characteristics of La-BCB. The equilibrium fluoride adsorption data fitted well with both Langmuir and Freundlich isotherm models. The RL value revealed that the defluoridation process using La-BCB was favorable. The adsorption kinetics followed pseudo-second order kinetic as well as particle and intraparticle diffusion models. The presence of car- bonate and bicarbonate reduced defluoridation capacity of La-BCB while sulphate, nitrate and chloride showed slight effect. The ex- hausted La-BCB was regenerated using sodium hydroxide with only 17% loss. The reasonable defluoridation mechanism could be interpreted as adsorption and ion exchange.
|
关 键 词: | La(Ⅲ) 水溶液 膨润土 聚氨基葡糖 加载 脱氟 傅里叶变换红外光谱学 Langmuir |
收稿时间: | 21 August 2013 |
本文献已被 维普 ScienceDirect 等数据库收录! |
|