“…Thus far, there are two main strategies to improve the stability or photocatalytic activity of Ag 3 PO 4 : one is to fabricate Ag 3 PO 4 nanostructures with different morphologies [11,15,[17][18][19], and the other is to assemble composites by coupling Ag 3 PO 4 with other semiconductors such as Ag 3 PO 4 /CeO 2 [20], Fe 3 O 4 -Ag 3 PO 4 [21], Ag 3 PO 4 -bentonite [22], Ag 3 PO 4 -graphene [23], Ag 3 PO 4 /TiO 2 [24,25], Ag 3 PO 4 /SnO 2 [26], Ag 3 PO 4 /BiOI [27], Ag 3 PO 4 /BiOBr [28], NiFe 2 O 4 /Ag 3 PO 4 [29], Ag 3 PO 4 /BiPO 4 [30], AgX/Ag 3 PO 4 (X = Cl, Br, I) [31,32], and CQDs/ Ag 3 PO 4 [33]. Using these strategies, the photocatalytic activities of these materials has been greatly improved.…”