Preparation Of Silver Phosphate-based Hybrid Photocatalyst And Experimental Study On The Photocatalytic Removal Of Tetracycline

Semiconductor photocatalysis is an extremely promising technology to deal with the far-reaching issues we need to face,such as the shortage of renewable-energy resources and the increasingly serious worldwide environmental problems.Ag₃PO₄ is an excellent visible-light-driven photocatalyst,showing an extraordinary photoactivity for oxygen evolution in water splitting and degradation of pollutant in aqueous solution.However,due to the uncontrollable photocorrosion phenomenon,the Ag₃PO₄-based photocatalysis is still at laboratory scale.To remove the obstacles for practical application and to further improve its photocatalytic performance,this paper summarized the achievements that have been made in this field.We began with an effort to introduce the reasons for Ag₃PO₄ exhibiting excellent photocatalytic performance.Subsequently,the different synthesis methods of Ag₃PO₄ were discussed.Finally,we outlined the barriers that hindered the practical application of Ag₃PO₄ and proposed the ways to remove these barriers.In addition,we synthesized a core-shell Ag₃PO₄@MIL-53?Fe?Z-scheme photocatalyst via a“bottle-around-ship”like solvothermal method to dealing with tetracycline.The surface area of Ag₃PO₄@MIL-53?Fe?composite is 397.945 m²/g,while the surface area of pure MIL-53?Fe?is 33.866 m²/g,suggesting that the Ag₃PO₄@MIL-53?Fe?composite possesses strong adsoption capability.Besides,experimental results showed that 76.22%of tetracycline?20 mg/L?was remoed in 60min by the core-shell Ag₃PO₄@MIL-53?Fe?Z-scheme photocatalyst while only 25.53%of tetracycline was removel by pure MIL-53?Fe?under the same condition,which means that this composite possesses excellent photo-removal capability towards tetracycline,and has high practical application value.The enhanced photocatalytic performance of Ag₃PO₄@MIL-53?Fe?nanocomposite could be contributed to its higher surface area,better absorption capability,and greater charge separation efficiency.In addition,the H₂O₂ concentration detection results for Ag₃PO₄?154?mol/L?and Ag₃PO₄@MIL-53?Fe??52?mol/L?indicated that a big part of generated H₂O₂ on the Ag₃PO₄ core would be quickly decomposed by the MIL-53?Fe?shell and generated more reactive species through the photo-Fenton-like reaction,which is benefit for the improvement of photocatalytic performance.This work provides a promising approach to construct core-shell structure photocatalyst and a new aspect to design multiple semiconductor composites heterojunction for environmental remediation.