Ag 3 PO 4 /MXene-TiO 2 -T: As an all-solid Z-type photocatalytic system with stable and enhanced photocatalytic performance

As a 2D transition metal material, its high conductivity makes Ti 3 C 2 MXene possible to be an efficient medium for electron transport; Ag 3 PO 4 has a high photocatalytic activity, but its high carrier recombination rate and serious photo-corrosion under light, the photocatalytic application is limited. In this study, a new Z-type heterojunction was constructed by electrostatic self-assembly of Ag 3 PO 4 loaded onto Ti 3 C 2 MXene calcined at a certain temperature. The presence of MXene can improve the separation efficiency of photoelectron-hole pairs, and the degradation rate of RhB within 120min under illumination is 94.068%, which is 42 times of Ti 3 C 2 MXene alone and 10.3 times of MT5 without calcination. At the same time, it also showed high degradation performance to other dyes and tetracycline hydrochloride. In terms of stability, AMT5 also has universal applicability in various salt solution environments and different pH conditions, and the degradation rate is still above 80% after 8 cycles. On this basis, a mechanism for dye removal is proposed. This research paves the way for the synthesis of stable and efficient photocatalysts for water treatment.