标题：Application of oxalic acid cross-linking activated alumina/chitosan biocomposites in defluoridation from aqueous solution. Investigation of adsorption mechanism作者：Li, Wan-Yi; Liu, Jie; Chen, Han; Deng, Yi; Zhang, Bing; Wang, Zhen;Zhang, Xu;Hong, Song
来源出版物：CHEMICAL ENGINEERING JOURNAL 卷：225 页：865-872 DOI：10.1016/j.cej.2013.03.105 出版年：JUN 1 2013
摘要：In this study, we used the oxalic acid cross-linking activated alumina/chitosan biocomposites (AACB) for defluoridation from aqueous solution for the first time. Scanning electron microscope (SEM) with energy dispersive X-ray spectroscopy (EDS), Zeta potential, Fourier transform infrared (FTIR) spectroscopy and X-ray photoelectron (XPS) spectroscopy were employed to study the structure and F- adsorption sites of AACB. Langmuir and Freundlich isotherms fit well with the experimental data, indicating a feature of monolayer F- adsorption and physicochemical adsorption on the surface of AACB. Zeta potentials with pH variation of AACB before and after fluoride sorption confirm that chemical adsorption with electrostatic interaction governs the adsorption process. Practical application of AACB was evaluated by F- adsorption under simulated F- concentration and pH value of drinking water which is naturally polluted by fluoride. The results demonstrated that AACB reduced F- concentration from 4.52 mg/L to 0.57 mg/L, below the F- permitted concentration (1.0 mg/L) in drinking water set by Ministry of Environmental Protection of the People's Republic of China. Furthermore, AACB keeps a high defluoridation effect under low basicity condition. FTIR and XPS analysis showed that -NH and Al-O work as F- adsorption sites. AACB presents a combined effect between alumina and chitosan during F- adsorption. This is a reason for the higher defluoridation capacity of AACB than alumina and chitosan separately. The oxalic acid cross-linking biocomposites showed potential application on purification of natural fluoride polluted water body.
作者关键词：Fluoride, Adsorption, Drinking water, Chitosan, Alumina
扩展关键词：DRINKING-WATER; ALUMINUM-OXIDE; FLUORIDE CONCENTRATIONS; NORTHERN CHINA; TAIYUAN BASIN; FIXED-BED; REMOVAL; GROUNDWATER; PHOSPHATE; GLUTARALDEHYDE
通讯作者地址：洪松(Hong, Song);Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430079, Peoples R China.
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[Li, Wan-Yi; Chen, Han; Deng, Yi; Zhang, Bing; Wang, Zhen; Zhang, Xu; Hong, Song] Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430079, Peoples R China.
[Li, Wan-Yi; Chen, Han; Deng, Yi; Zhang, Bing; Wang, Zhen; Zhang, Xu; Hong, Song] Wuhan Univ, Hubei Biomass Resource Chem & Environm Biotechnol, Wuhan 430079, Peoples R China.
[Liu, Jie] Hunan Univ, Coll Environm Sci & Engn, Changsha 410082, Hunan, Peoples R China.
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