Photodegradation of Alachlor Over Fe - TiO 2 on Granular Activated Carbon Support under UV and Visible Light
نویسندگان
چکیده
Fe-TiO2 on granular activated carbon support was synthesized via hydrothermal method without calcination. The crystalline phases were identified using X-ray diffraction whereas the surface morphologies were examined using scanning electron microscopy. Peaks of anatase TiO2 and graphite were present in the Fe-TiO2-GAC sample. Comparisons of the surface features of GAC and Fe-TiO2-GAC show that Fe-TiO2 has been immobilized in the pores and on the outer layer of the GAC. Alachlor photodegradation using Fe-TiO2-GAC under UV and visible light were compared to removal by adsorption using GAC only. Both photocatalytic experiments gave higher removal efficiencies than the adsorption process. Photocatalysis under UV and visible light can remove alachlor at the same rate after 30 min of reaction. Complete removal of alachlor was observed from all three experiments after 150 min of reaction. The mechanism of alachlor removal using Fe-TiO2-GAC has been a combination of adsorption and photocatalysis. Keywords—Alachlor, Fe-TiO2, Granular activated carbon support, Photocatalysis.
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