Photodegradation of S-metolachlor using metal oxide doped tungsten oxide under visible light

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Linda Horiean
Thanyaluck Sakonwaree
Nontaporn Sirichaiwattananun
Pramoch Rangsunvigit
Mutsee Termtanun

Abstract

In this research, tungsten oxide (WO3) nanoparticles were modified by doping oxide of bismuth (Bi), vanadium (V), or manganese (Mn) at 0.5, 1, 2% (w/w). The undoped WO3 and Bi/V/Mn oxide doped WO3 were synthesized by using sol-gel method to find out the suitable metal loading amount for S-metolachlor degradation. After synthesis, the methods and techniques were performed for characterization the prepared catalysts. The photocatalytic activities of undoped and doped WO3 samples in catalyzing S-metolachlor degradation under visible light were determined. After 4 h reaction, ultraviolet-visible (UV-Vis) spectroscopy was performed to observe the remaining concentration of S-metolachlor. From the characterization results, WO3 had larger surface area and crystalline size after loading Bi/V/Mn oxide, but with the less electrons-holes recombination. Among three different doped metal oxides and different doping quantities, 1% (w/w) Bi2O3 doped WO3 had the least electrons-holes recombination rate and provide the highest photocatalytic efficiency with 55.43% S-metolachlor degradation for a period of 4 h under visible light. Furthermore, the reusability of doped-photocatalysts was also examined to check the deactivation possibility. There was approximately 3% decrease in photoactivity of 1% (w/w) Bi2O3 doped WO3 after repeating photodegradation of S-metolachlor for 3 times.

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Engineering

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