Water Depollution Using Ferrites Photocatalysts
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abstract
The presence of organic pollutants and pathogenic microorganisms in water has become an increasing concern throughout the world. Heterogeneous photocatalytic technologies have been applied to control the organic pollutants and microorganisms in water. Development of narrow band-gap photocatalysts which function in the visible light remains a challenge in the wastewater treatment processes. Spinel ferrites has attracted a remarkable attention because of a relatively narrow band gap of about 2.0 eV, which has considerable photo-response in the visible light region. This chapter reviews recent advances in ferrites and the application of visible light photocatalysts to the remediation of contaminants such as H2S, phenols, and dyes in water. Recent development in synthesis and characterization of ferrite and hybrid ferrites with other semiconductors is reviewed. The applications of ferrites in photocatalytic conversion of visible solar energy to generate e/h+, which in turn produce reactive oxygen species through redox processes for the degradation of the pollutants in water, are demonstrated. We discuss the enhanced visible photocatalytic activity of ferrites by doping with metals and combing with other photocatalysts. Moreover, the addition of H2O2 to ferrite either in dark or visible light irradiation indicates the enhanced degradation efficiency for organic pollutants.
