TY - JOUR
T1 - La3+-modified activated alumina for fluoride removal from water
AU - Cheng, Jiemin
AU - Meng, Xiaoguang
AU - Jing, Chuanyong
AU - Hao, Jumin
PY - 2014/8/15
Y1 - 2014/8/15
N2 - A La3+-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 La3+ 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.
AB - A La3+-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 La3+ 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.
KW - Activated aluminum
KW - Fluoride
KW - Lanthanum
KW - Water
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UR - http://www.scopus.com/inward/citedby.url?scp=84903602693&partnerID=8YFLogxK
U2 - 10.1016/j.jhazmat.2014.06.008
DO - 10.1016/j.jhazmat.2014.06.008
M3 - Article
C2 - 24996152
AN - SCOPUS:84903602693
SN - 0304-3894
VL - 278
SP - 343
EP - 349
JO - Journal of Hazardous Materials
JF - Journal of Hazardous Materials
ER -