Preparation Of Novel BiOX Photocatalyst And Study On Visible Light Catalytic Degradation Of Tetracycline Hydrochloride

In recent years,environmental pollution caused by antibiotics and their potential impact on the ecosystem have received extensive attention from environmental workers.Antibiotic wastewater is one of the main sources of antibiotic pollution in the environment.It has the characteristics of high toxicity to organisms,high concentration,and low biodegradability,and belongs to refractory organic wastewater.The traditional activated sludge method or biofilm process has unsatisfactory results in degradation of antibiotic wastewater.Efficient antibiotic wastewater treatment technology has become the difficult and hot spot in the field of wastewater treatment.The photocatalytic oxidation method has shown broad application prospects in water pollution control.It has the advantages of simple equipment and process,low energy consumption,and stability.However,the efficiency of photocatalyst needs to be further improved,and the mechanism of photocatalytic degradation still needs to be explored in depth.The ideal photocatalyst should have the characteristics of wide light response range,strong charge separation and transfer ability,and abundant active oxygen species.It is difficult for traditional semiconductor catalytic materials to achieve these conditions at the same time,which brings challenges to the application of photocatalytic technology.Because Bi-based materials have the advantages of abundant storage capacity,layered stacking of crystal structure,and adjustable electronic structure,Bi-based semiconductor materials have received widespread attention in the field of photocatalytic oxidation of refractory organic pollutants.Among them,the BiOX(X=Cl,Br,I)photocatalyst has broad application prospects in the treatment of refractory organic pollutants.BiOX is easy to prepare,stable in performance,non-toxic and cheap,but it still has limitations such as low charge separation efficiency and insufficient photocatalytic micro-reaction mechanism.There are still many challenges in improving photocatalytic efficiency or exploring reaction mechanisms of BiOX.In view of the current situation of antibiotic pollution and treatment,bismuth halide photocatalysis materials which can oxidize and remove antibiotics under visible light were designed and prepared in this paper.The mechanism of photocatalytic free radical formation and the efficiency and characteristics of tetracycline hydrochloride degradation were revealed.The mechanism of oxygen vacancy,Bi and heterojunction to improve the photocatalytic performance of BiOX was discussed by theoretical calculation and characterization analysis.The formation and action rules of active free radicals were analyzed and explored.In this paper,the influencing factors of photocatalysis reaction were explored,and the possible degradation path of tetracycline hydrochloride was proposed by UV-vis full spectrum scanning and LC/MS-MS analysis.This paper provides guidance for the design of new type of BiOX visible light driven(VLD)photocatalyst with high activity,and provides theoretical support for further expanding the application of photocatalytic technology in water pollution control.