Photocatalytic Degradation of 2,4-dichlorophenol using BiVO₄ Powder Prepared by the Sol–gel Method

抄録

Bismuth vanadate (BiVO₄) powder was prepared by the sol–gel method using bismuth nitrate and ammonium vanadate as the starting precursors with mole ratio of 1:1 in ethanol media at 70ºC for 1h and calcined at 400–600°C for 2h. The phase structure of BiVO₄ powder was characterized by X–ray diffractrometer (XRD). Single phase monoclinic of BiVO₄ powder was obtained. The morphology of BiVO₄ powder was characterized by scanning electron microscope (SEM). BiVO₄ powder was irregular in shape with the particles’ size range of 100–300 nm. The functional groups of BiVO₄ powder was identified by Fourier transform infrared spectrophotometer (FT–IR). The symmetric and asymmetric stretching of VO₄^3- was showed at 826–829 and 737–741 cm^-1, respectively. The surface area of BiVO₄ powder was determined by surface area analyzer (BET) and shown in the range of 2.20–2.75 m²g^-1. The photocatalytic degradation of 2,4-dichlorophenol was investigated by high performance liquid chromatograph (HPLC). The percentage of degradation of 2,4-dichlorophenol using BiVO₄ powder after calcination at 500°C for 2h was 55.42%.