Research on photocatalytic removal of RhB from wastewater over 2D BiOX
Purposes—To study the removal performance and mechanism of Rhodamine B(RhB)from water over two-dimensional(2D)halide bismuth oxide(BiOX,X=Cl,Br,I).Methods—2D BiOX was synthesized with solvothermal method.The structure,morphology and optical properties of BiOX materials were analyzed with multiple characterization methods.The photocatalytic removal performance of RhB from water over 2D BiOX under UV-Vis light irradiation was investigated.Re-sults—The degradation rate of RhB reaches 98.8％over BiOCl photocatalyst after RhB is exposed to light for 180 min.The degradation process accords to the pseudo-first-order reaction kinetics model with the reaction rate constant of 22.9 X 10-3 min-1.Under the catalysis of BiOCl,when TBA and CHC13 were used as trapping agents,the degradation rate of RhB has no significant change.However,when EDTA-2Na and K2Cr2O7 were used as trapping agents,the degradation rate of RhB decreases obviously.Conclusions—The highest photocatalytic activity of BiOCl can be attributed to its fast carri-er transfer rate and strong redox ability.The active species which play a key role in the reaction process are holes and electrons.
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维普
