title: La3+-modified activated alumina for fluoride removal from water.
abstract: A La(3+)-modified activated alumina (La-AA) adsorbent was prepared for effective removal of fluoride from water. The surface properties of adsorbent were characterized with zeta potential analysis, SEM-EDS and EXAFS. Batch and column experiments were conducted to evaluate improvement of F(-) removal by the La-AA. SEM/EDS and EXAFS analyses determined the formation of La(OH)3 coating on the AA and strong bonding interactions between La(3+) and the Al atoms. The points of zero charge (pHPZC) of AA and La-AA were at pH 8.94 and 9.57, respectively. Batch experimental results indicated that the La-AA had much higher adsorption rate and capacity than the AA. The F(-) adsorption processes on La-AA and AA followed the pseudo-second-order kinetics and the Langmuir isotherm. Column filtration results shows that the La-AA and AA treated 270 and 170 bed volumes of the F(-)-spiked tap water, respectively, before F(-) breakthrough occurred. The results demonstrated that the La-AA was a promising adsorbent for effective removal of F(-) from water.
authors.affiliation: College of Population Resources and Environment, Shandong Normal University, Jinan 250014 China. Electronic address: jmcheng2002@hotmail.com.
authors.forename: Jiemin
authors.initials: J
authors.lastname: Cheng
authors.affiliation: Center for Environmental Systems, Stevens Institute of Technology, Hoboken, NJ 07030, USA.
authors.forename: Xiaoguang
authors.initials: X
authors.lastname: Meng
authors.affiliation: Center for Environmental Systems, Stevens Institute of Technology, Hoboken, NJ 07030, USA.
authors.forename: Chuanyong
authors.initials: C
authors.lastname: Jing
authors.affiliation: Center for Environmental Systems, Stevens Institute of Technology, Hoboken, NJ 07030, USA.
authors.forename: Jumin
authors.initials: J
authors.lastname: Hao
mesh_terms: D000327:Adsorption; D000537:Aluminum Oxide / Q000737:chemistry*; D005459:Fluorides / Q000737:chemistry*; D007811:Lanthanum / Q000737:chemistry*; D013499:Surface Properties; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
chemical_list: D014874:Water Pollutants, Chemical; D007811:Lanthanum; D000537:Aluminum Oxide; D005459:Fluorides
keywords: Activated aluminum; Fluoride; Lanthanum; Water