1 Introduction</h5> Industrial wastewaters, especially such as tannery and textile processing effluents, are often detected containing a high content of dissolved organic dyes, which are usually hazardous to organisms [1,2] . At present, removal of organic dyes from wastewater is a serious challenge faced by human beings. To address this challenge, many technologies of organic dye degradation such as chemical oxidation, physical adsorption and biodegradation have been developed. However, these technologies still have some problems such as secondary pollution or unsatisfactory treatment. Lately, photocatalytic applied in organic pollutant removal has caused much attention due to the utilization of abundant solar energy without the need for additional chemical regents. Hence, many types of semiconductor photocatalysts such as TiO 2 [3–5] , ZnO  and BiPO 4  were successfully prepared by a variety of methods. To date, TiO 2 is still the most widely investigated semiconductor photocatalytic material owning to high activity under UV irradiation. But UV light only accounts for no more than 4% of the solar spectrum, which limits its practical application for environmental remediation. To effectively harness abundant natural sunlight, many visible-light-driven photocatalysts such as BiVO 4 [8,9] , Bi 2 WO 6  , BiOI
Applied Catalysis B: Environmental – Elsevier
Published: Jan 1, 2014
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