One-pot Synthesis of NVO/rGO Photocatalyst

The NH₄V₄O₁₀/rGO (NVO/rGO) photocatalyst was prepared via a facile one-pot hydrothermal method. NH₄VO₃ and GO were used as precursors and mixed with a weight ratio of 10:1. In brief, 0.6 g of NH₄VO₃ and 0.6 g of oxalic acid were dissolved in 90 ml of deionized water. In the meantime, 60 mg of GO was dispersed in 30 ml of deionized water with ultrasonication (20 W, 30 min). Next, the prepared reagents were mixed together and sonicated for 15 min. Then, the as-obtained reaction mixture was transferred to a Teflon-lined stainless-steel autoclave (volume 1.8 L) for 8 h and 180 °C. Finally, the obtained product was washed with deionized water and dried at 40 °C under reduced pressure (0.01 bar). For comparison, bare NH₄V₄O₁₀ (NVO) without GO was synthesized in an analogous procedure.