Preparation method and application of nitrogen-boron co-doped carbon material modified silver phosphate-based photocatalyst

The invention discloses a preparation method and application of a nitrogen-boron co-doped carbon material modified silver phosphate-based photocatalyst. The composite photocatalyst is prepared by adopting an electrostatic self-assembly method, taking a boron and carbon co-doped carbon material (NBTs) as a carrier and performing liquid-phase chemical deposition on nano silver phosphate. The preparation method comprises the following steps: preparing 0.1-20mg/L NBTs suspension, adding silver salt and phosphate into the NBTs suspension according to a ratio of 3: 1, and carrying out chemical deposition reaction to obtain the NBTs modified silver phosphate-based photocatalyst. The composite photocatalyst is high in light absorption capacity, low in photo-induced electron-hole recombination rate, high in visible light photocatalytic efficiency, good in stability, simple in process, low in cost and suitable for large-scale industrial production, and conditions are easy to control. The composite photocatalyst can be