La3+-modified activated alumina for fluoride removal from water

Jiemin Cheng, Xiaoguang Meng, Chuanyong Jing, Jumin Hao

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128 Scopus citations

Abstract

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.

Original languageEnglish
Pages (from-to)343-349
Number of pages7
JournalJournal of Hazardous Materials
Volume278
DOIs
StatePublished - 15 Aug 2014

Keywords

  • Activated aluminum
  • Fluoride
  • Lanthanum
  • Water

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