Construction of a novel Ag/Ag_(3)PO_(4)/MIL-68(In)-NH_(2)plasmonic heterojunction photocatalyst for high-efficiency photocatalysis

To boost the visible light catalytic performance of typical metal-organic frameworks(MOFs)materials(MIL-68(In)-NH_(2)),a novel stable Z-scheme Ag/Ag_(3)PO_(4)/MIL-68(In)-NH_(2)plasmonic photocatalyst was constructed by electrostatic attraction,co-precipitation reaction,and in-situ photoreduction reaction methods for the first time.The photocatalytic activities of the photocatalysts are systematically explored by the photocatalytic degradation of bisphenol A(BPA)and reduction of Cr(VI)under visible light.Ag/Ag_(3)PO_(4)/MIL-68(In)-NH_(2)displays the best photocatalytic performance among the as-prepared photocatalysts.The rate constant of BPA degradation on Ag/Ag_(3)PO_(4)/MIL-68(In)-NH_(2)is 0.09655 min^(-1),which is better than many reported photocatalytic materials.It also achieved a maximum rate constant of 0.02074min^(-1)for Cr(VI)reduction.The boosted photocatalytic performance is due to the improved absorption caused by localized surface plasmon resonance(LSPR),effective interface charge transfer and separation,and more reactive sites provided by the large specific surface area.Besides,the photocatalytic degradation pathway of BPA is concluded according to GC-MS analysis.Finally,a more reasonable Z-scheme mechanism is speculated and verified through a series of characterizations and simulations,such as timeresolved photoluminescence spectroscopy(TRPL),electron spin resonance(ESR),and finite difference time domain(FDTD)method.

In-situ construction of amorphous/crystalline contact Bi_(2)S_(3)/Bi_(4)O_(7) heterostructures for enhanced visible-light photocatalysis

Constructing a heterojunction photocatalyst is a significant method to enhance photocatalytic activity because it can promote the separation of photogene rated carriers.Herein,amorphous/crystalline contact Bi_(2)S_(3)/Bi_(4)0_(7) heterostructure was successfully synthesized by in-situ sulfidation of Bi407.The amorphous Bi_(2)S_(3) is diffused on the surface of Bi_(4)0_(7) rod,enhancing the visible light response and improving the transport of photogene rated carriers.Various characterizations confirm that the rapid separation of photogene rated carriers leads to increased photocatalytic performance.The optimized Bi_(2)S_(3)/Bi_(4)O_(7) heterostructure photocatalyst(BiS-0.15) exhibits the highest Cr(Ⅵ) reduction(0.01350 min^(-1)) and RhB oxidation(0.08011 min^(-1)) activity,which is much higher than that of pure Bi_(4)0_(7) and mixture under visible light irradiation.This work provides new insights into the construction of efficient novel photocatalysts.

A review on metal-organic frameworks for photoelectrocatalytic applications

Semiconductor-based photoelectrocatalytic processes have attracted considerable research interest for solar energy collection and storage.Photoelectrocatalysis is a heterogeneous photocatalytic process in which a bias potential is applied to a photoelectrode,and thus the photoelectrocatalytic performance is closely related to the photoelectrode prepared by semiconductors.Among various semiconductors,metal-organic frameworks(MOFs)have attracted more and more attention because of their unique properties such as optical properties and adjustable structure.Herein,a comprehensive review on different MOFs(Ti-based,Zn-based,Co-based,Fe-based,Cu-based,and mixed metal-based MOFs)for heterogeneous photoelectrocatalysis is carried out and,in particular,the application of this technique for CO2 conversion and water splitting is discussed.In addition,the challenges and development prospects of MOFs in photoelectrocatalysis are also presented.