Facile synthesis of PVDF photocatalytic membrane based on NCQDs/BiOBr/TiO2 heterojunction for effective removal of tetracycline

Porous TiO2 nanorods were synthesized by H2SO4 etching method, combined with the synthesis technology of BiOBr-TiO2 heterojunction and NCQDs to synthesis the ternary NCQDs-BiOBr-TiO2 photocatalyst. The micromorphology and structural composition of different powder catalysts and photocatalytic composite membranes were studied by means of various characterization methods. The UV-vis DRS results indicated that the formation of BiOBr-TiO2 heterojunction and the introduction of NCQDs extended the visible light absorption range of photocatalytic materials. The BSA adsorption performances of different composite membranes were investigated, and the results showed that 0.5-NCQDs-BiOBr-TiO2/PVDF composite membranes had strong antifouling properties. Moreover, it was found that the 0.5-NCQDs-BiOBr-TiO2/PVDF composite membranes exhibited high regeneration stability and easy separation recovery performance. The results showed that the TC degradation rate of 0.5-NCQDs-BiOBr-TiO2/PVDF composite membranes reached 77% within 120 min. Moreover, the pseudo first order kinetic apparent rate constant k value of the 0.5-NCQDs-BiOBr-TiO2/PVDF composite membranes was 0.01342 min(-1).

Automated summary

The synthesis and application of ternary NCQDs-BiOBr-TiO2 photocatalysts in photocatalytic degradation were investigated. The composite membranes exhibited strong antifouling properties, high degradation rate, and significant application potential.