Characteristics and model studies for fluoride and arsenic adsorption on goethite  

作　　者：Yulin Tang Jianmin Wang Naiyun Gao 

机构地区：[1]State Key Laboratory of PoUution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China. [2]Department of Civil, Architectural & Environmental Engineering, Missouri University of Science and Technology, Rolla, MO 65409, USA

出　　处：《Journal of Environmental Sciences》2010年第11期1689-1694,共6页环境科学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.21007048);the Special Fund of State Key Joint Laboratory of Environmental Simulation and Pollution Control(No.10K09ESPCT);the National Major Science and Technology Project of China(No.2008ZX07421-002)

摘　　要：Fluoride and arsenic are major anionic elements of concern in drinking water treatment. The effects of contact time, pH, surface loading and ionic strength on adsorption of fluoride and As（V） were investigated using batch methods. Adsorption of fluoride and As（V） onto goethite obeyed a pseudo second-order rate law. Through experimental data and adsorption kinetic analysis, the affinity of As（V） onto goethite was stronger than fluoride. Fluoride and As（V） uptake by goethite all decreased with pH increasing at the same surface loading; however, ionic strength had slight influence on their adsorption. A surface sites-species model was used to quantify the adsorption of fluoride and As（V） onto goethite as function of pH and surface loading. This model can satisfactorily predict their adsorption characteristics with several adsorption constants.Fluoride and arsenic are major anionic elements of concern in drinking water treatment. The effects of contact time, pH, surface loading and ionic strength on adsorption of fluoride and As（V） were investigated using batch methods. Adsorption of fluoride and As（V） onto goethite obeyed a pseudo second-order rate law. Through experimental data and adsorption kinetic analysis, the affinity of As（V） onto goethite was stronger than fluoride. Fluoride and As（V） uptake by goethite all decreased with pH increasing at the same surface loading; however, ionic strength had slight influence on their adsorption. A surface sites-species model was used to quantify the adsorption of fluoride and As（V） onto goethite as function of pH and surface loading. This model can satisfactorily predict their adsorption characteristics with several adsorption constants.

关 键 词：ADSORPTION FLUORIDE ARSENIC GOETHITE 

分 类 号：O647.3[理学—物理化学] S153.61[理学—化学]