TY - JOUR
T1 - Fluoride adsorption onto activated alumina
T2 - Modeling the effects of pH and some competing ions
AU - Tang, Yulin
AU - Guan, Xiaohong
AU - Su, Tingzhi
AU - Gao, Naiyun
AU - Wang, Jianmin
PY - 2009/4/1
Y1 - 2009/4/1
N2 - The adsorption characteristics of fluoride on activated alumina (AA) were studied using batch methods. Effects of reaction time, pH, ionic strength, and coexisting anions were determined. Kinetics data indicated that the fluoride adsorption process reached equilibrium within 10 h. In an experimental pH range of 5-10.5, fluoride uptake decreased with the increase of pH. Ionic strength did not impact fluoride adsorption in the entire experimental pH range. However, major anions reduced fluoride adsorption in the order of HPO42- > HCO3- > SO42- > Cl-. Other toxic elements that might coexist with fluoride in groundwater, such as arsenic and selenium, also reduced fluoride adsorption through competition for the same surface sites. A speciation-based model was used to quantify the fluoride adsorption on activated alumina as functions of pH, with and without competing toxic elements. This model simulated fluoride adsorption well over a broad pH range of 5-10.5, and a wide surface loading range of 1-10 mg-F/g adsorbent.
AB - The adsorption characteristics of fluoride on activated alumina (AA) were studied using batch methods. Effects of reaction time, pH, ionic strength, and coexisting anions were determined. Kinetics data indicated that the fluoride adsorption process reached equilibrium within 10 h. In an experimental pH range of 5-10.5, fluoride uptake decreased with the increase of pH. Ionic strength did not impact fluoride adsorption in the entire experimental pH range. However, major anions reduced fluoride adsorption in the order of HPO42- > HCO3- > SO42- > Cl-. Other toxic elements that might coexist with fluoride in groundwater, such as arsenic and selenium, also reduced fluoride adsorption through competition for the same surface sites. A speciation-based model was used to quantify the fluoride adsorption on activated alumina as functions of pH, with and without competing toxic elements. This model simulated fluoride adsorption well over a broad pH range of 5-10.5, and a wide surface loading range of 1-10 mg-F/g adsorbent.
KW - Arsenic
KW - Competitive adsorption
KW - Fluoride
KW - Selenium
KW - Speciation-based model
UR - https://www.scopus.com/pages/publications/59349112478
U2 - 10.1016/j.colsurfa.2008.11.027
DO - 10.1016/j.colsurfa.2008.11.027
M3 - 文章
AN - SCOPUS:59349112478
SN - 0927-7757
VL - 337
SP - 33
EP - 38
JO - Colloids and Surfaces A: Physicochemical and Engineering Aspects
JF - Colloids and Surfaces A: Physicochemical and Engineering Aspects
IS - 1-3
ER -