화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of Industrial and Engineering Chemistry, Vol.21, 677-682, January, 2015
DOI10.1016/j.jiec.2014.03.036  Export Citation
UV-VIS photocatalytic degradation of nitrobenzene from water using heavy metal doped titania
Ines Nitoi1, Petruta Oancea2, †, Malina Raileanu3, Maria Crisan3, Lucian Constantin1, 4, and Ionut Cristea1
  • 1National Research & Development Institute for Industrial Ecology-ECOIND, 71-73 Drumul Podu Dambovitei St. , 060652 Bucharest, Romania
  • 2Department of Physical Chemistry, Faculty of Chemistry, University of Bucharest, Bd. Elisabeta, 4-12, Bucharest 030016, Romania
  • 3Ilie Murgulescu Institute of Physical Chemistry, Romanian Academy, Bucharest, Romania
  • 4Faculty of Applied Chemistry and Materials Science, University Politehnica of Bucharest, 1-7 Gheorghe Polizu St., 011061 Bucharest, Romania
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The photocatalytic degradation of nitrobenzene (NB) under UV-VIS irradiation with un-doped TiO2 and various heavy metals doped TiO2 powders were studied for aerated solutions. The dopant type (Fe, Co, Ni) and its concentration (0.5-5 wt.% TiO2) influence on pollutant degradation efficiency were investigated. The photocatalyst with lowest Fe content (0.5 wt.%) showed a considerable better behaviour in respect to pollutant degradation than catalyst with higher Fe content and Co and Ni doped titania catalysts. The experiments were carried out for solutions with (0.37-8.45) × 10^(-4) M NB initial content, using 50-250 mg/L catalyst dose, at various pHs (4-10) and irradiation time between 30 and 240 min. The kinetics of NB degradation and organic nitrogen mineralization was assessed and pseudofirst order rate constants were calculated. For optimum working conditions (0.5 wt.% Fe doped-TiO2 loading of 250 mg/L, 2.52 × 10^(-4) Mpollutant initial concentration, pH = 7 and 240 min irradiation time) NB removal and organic nitrogen mineralization efficiencies were 99% and 85%, respectively. It was also demonstrated that degradation process occurs on catalyst surface, so experimental results are in accordance with Langmuir-Hinshalwood model.
Keywords:Photocatalysis;Doped TiO2 catalyst;Heavy metals;Nitrobenzene degradation
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