Ternary heterojunction Ag/AgIO3/ BiOCl(CMC) by a biomass template for photodegradation of tetracycline hydrochloride and gaseous formaldehyde

Abstract

Ternary heterojunction photocatalyst Ag/AgIO3/BiOCl and Ag/AgIO3/BiOCl(CMC) were prepared to solve the contaminants of TC antibiotics residue in water and volatilizing HCHO in indoor air. Morphology modification, heterojunction construction, dominant facet controlling and surface plasma resonance strategies were merged into to modify the photocatalyst. First, biomass solvent assisted synthesis of AABC-CMC does a favor for harvesting the visible light and improving the adsorption of organic pollutants compared to AABC. In addition, Ag nanoparticles (NPs) have been successfully anchored on the surface of heterostructure to enhance the adsorption of visible light, and act as a visible light “trigger” for two wide band gap components of heterojunction. Non-centrosymmetric AgIO3 and band gap matching in heterostructure accelerates separating and transferring of electron-hole pairs, and reduces the probability of recombination. Besides, the IEF differing in BiOCl(CMC) and BiOCl results the difference of photocarriers migrating path when composited with AgIO3.The shorter transmission distance in the AABC-CMC reduces the recombination of photocarriers in the bulk and improve photocatalytic property of AABC-CMC. The possible charge transfer mechanism and key radicals differs in photodegradating process, O2− and OH plays a major role in photo-degrading TC and HCHO, respectively.