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RESEARCH ARTICLE  [Accepted]
Enhanced photocatalytic oxidation of humic acids using Fe3+-Zn2+ co-doped TiO2: The effects of ions in aqueous solutions
Rongfang Yuan, Dan Liu, Shaona Wang, Beihai Zhou, and Fangshu Ma
Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, Department of Environmental Engineering, School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China
Corresponding Author: Fangshu Ma ,Tel: +86-10-62334821, Email: mfsustb@sina.com
Received: May 17, 2017;  Accepted: August 14, 2017.
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ABSTRACT
Photocatalytic oxidation in the presence of Fe-doped, Zn-doped or Fe-Zn co-doped TiO2 was used to effectively decompose humic acids (HAs) in water. The highest HAs removal efficiency (65.7%) was achieved in the presence of 500°C calcined 0.0010% Fe-Zn co-doped TiO2 with the Fe:Zn ratio of 3:2. The initial solution pH value, inorganic cations and anions also affected the catalyst photocatalytic ability. The HAs removal for the initial pH of 2 was the highest, and for the pH of 6 was the lowest. The photocatalytic oxidation of HAs was enhanced with the increase of the Ca2+ or Mg2+ concentration, and reduced when concentrations of some anions increased. The inhibition order of the anions on TiO2 photocatalytic activities was CO32- > HCO3- > Cl-, but a slightly promotion was achieved when SO42- was added. TOC removal was used to evaluate the actual HAs mineralization degree caused by the 500°C calcined 0.0010% Fe-Zn (3:2) co-doped TiO2. For tap water added with HAs, the UV254 and total organic carbon (TOC) removal rates were 57.2% and 49.9%, respectively. The UV254 removal efficiency was higher than that of TOC because of the generation of intermediates that could significantly reduce the UV254, but not the TOC.
Keywords: Fe3+-Zn2+ co-doped TiO2 | Humic acids | Inorganic ions | Photocatalytic oxidation
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