Application of titanium dioxide in arsenic removal from water: A review
DOI: 10.1016/j.jhazmat.2012.02.069
Title: Application of titanium dioxide in arsenic removal from water: A review
Journal Title: Journal of Hazardous Materials
Publication Date: 15 May 2012
Start Page: 1
End Page: 16
Published online: online 3 March 2012
ISSN: 0304-3894

  • a State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai, PR China

  • b State Key Lab of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, PR China

  • c Center for Environmental Systems, Stevens Institute of Technology, Hoboken, NJ 07030, USA
  • Abstract: arsenic pollution is a global phenomenon and various technologies have been developed to remove arsenic from drinking water. The Application of TiO2 and TiO2-based materials in removing inorganic and organic arsenic was summarized. TiO2-based arsenic removal methods developed to date have been focused on the photocatalytic oxidation (PCO) of arsenite/organic arsenic to arsenate and adsorption of inorganic and organic arsenic. Many efforts have been taken to improve the performance of TiO2 by either combing TiO2 with adsorbents with good adsorption property in one system or developing bifunctional adsorbents with both great photocatalytic ability and high adsorption capacity. Attempts have also been made to immobilize fine TiO2 particles on supporting materials like chitosan beads or granulate it to facilitate its separation from water. Among the anions commonly exist in groundwater, humic acid and bicarbonate have significant influence on TiO2 photocatalyzed oxidation of As(III)/organic arsenic while phosphate, silicate, fluoride, and humic acid affect arsenic adsorption by TiO2-based materials. There has been a controversy over the TiO2 PCO mechanisms of arsenite for the past 10 years but the adsorption mechanisms of inorganic and organic arsenic onto TiO2-based materials are relatively well established. Future needs in TiO2-based arsenic removal technology are proposed.
    Accepted: 25 February 2012
    Received: 6 December 2011
    Revised: 6 February 2012
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