Catalytic degradation of sulfamethazine by m-Bi2O4 via synergistic piezoelectric-light effect
In this paper,we prepare m-Bi2O4 via a simple hydrothermal method,and analyze its structure,morphol-ogy,surface valence and piezoelectric photocatalytic performance using characterization methods such as XRD,XPS,SEM,TEM,UV-vis DRS and PFM.Furthermore,we test the piezoelectric photocatalytic activity of the material using sulfamethazine(SM)as a simulated pollutant.The results show that m-Bi2O4 outperforms BaTiO3 and BiOCl in catalytic performance,indicated by its high SM degradation efficiency(96.46％)after 60 min of synergistic pie-zoelectric-light action,and m-Bi2O4 still holds high catalytic activity under weakening light energy.In addition,su-peroxide radicals with high oxidation activity and a small amount of hydroxyl radicals and singlet oxygen have been captured in the reaction system.We also propose a possible mechanism of piezoelectric photocatalysis.
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