Removal of fluoride ions from aqueous solution using modified attapulgite as adsorbent.
Adsorption of fluoride ions from water using modified attapulgite with magnesium and aluminum salts was conducted by batch experiments. The effects of temperatures and mass ratios of attapulgite, magnesium and aluminum salts were investigated. Linear and non-linear methods were applied for fitting the adsorption data with Langmuir, Freundlich, and Redlich-Peterson isotherms. Modified attapulgite with a mass ratio attapulgite:Mg Cl(2)x6H(2)O:AlCl(3)x2H(2)O=2:1:2 had higher fluoride adsorption capacity. In addition, the fluoride adsorption using the modified attapulgite included an anion exchange process.
Zhang
Jing
J
Department of Environmental Sciences, State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Science and Engineering, Peking University, Beijing, People's Republic of China.
Xie
Shaodong
S
Ho
Yuh-Shan
YS
D000327:Adsorption; D000077410:Aluminum Chloride; D017607:Aluminum Compounds; D002712:Chlorides; D005459:Fluorides / Q000302:isolation & purification*; D007474:Ion Exchange; D015636:Magnesium Chloride; D017616:Magnesium Compounds / Q000737:chemistry*; D017655:Silicon Compounds / Q000737:chemistry*
D017607:Aluminum Compounds; D002712:Chlorides; D017616:Magnesium Compounds; D017655:Silicon Compounds; D015636:Magnesium Chloride; D000077410:Aluminum Chloride; D005459:Fluorides; C026325:attapulgite