Abstract
The antibiotic tetracycline (TCH) is a common pollutant seen in industrial wastewaters and municipal wastewaters, which poses an environmental problem. To solve this, oxygen modified carbon nitride (O-C3N4) and a Z-type heterojunction O-C3N4/Bi2Mo2O9 with excellent photocatalytic performance was constructed. The degradation efficiency of O-C3N4/Bi2Mo2O9-60 % for TCH (10 mg/L) was as high as 89.9 % under 3 h of illumination. The corresponding degradation rate was 1.9 and 3.1 times higher than that of O-C3N4 and Bi2Mo2O9, respectively, due to the effective carrier separation and the increased specific surface area. The Z-type heterojunction construction of the O-C3N4/Bi2Mo2O9-60 % composite and corresponding TCH degradation mechanism were further assessed through exploring the electron transfer, active radical and reaction paths. Furthermore, the O-C3N4/Bi2Mo2O9-60 % composite exhibited a high cyclic stability, and its degradation efficiency remained at 87.5 % after 5 cycles. The O-C3N4/Bi2Mo2O9-60 % composite also had excellent adaptability to the actual aqueous environment, and the degradation efficiency for TCH in different actual aqueous environments remained above 70 %. All results indicated that O-C3N4/Bi2Mo2O9 composites have significant visible photocatalytic performance and can be used for the practical removal of TCH pollutants.
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