The NaBH4 Reduction and pH Effects on the Optical Property of Bismuth Vanadate Anung Riapanitra, Michael Julian Haryanto, Tien Setyaningtyas, Kapti Riyani and Santi Nur Handayani E3S Web Conf., 609 (2025) 02001 Published online: 24 January 2025 DOI: 10.1051/e3sconf/202560902001