Abstract
Novel visible light responsive g-C3N4/CdWO4 photocatalysts were formed by an in situ growth mechanism and employed in the degradation of a tetracycline (TC) antibiotic. The as-prepared composites were studied by several characterization techniques. Results revealed that the interface interaction between CdWO4 and g-C3N4 was recognized via CdWO4 nanorod loading on the surface of the layered g-C3N4, improving the separation and transfer of the photoexcited hole and electron pairs and restraining the recombination rate of photoinduced charge carriers. As a result, the photocatalytic activity of the g-C3N4/CdWO4 was enhanced in comparison with pure g-C3N4 and CdWO4 for TC degradation under visible light irradiation. Among the as-synthesized samples, the 80 wt% g-C3N4/CdWO4 photocatalyst showed optimal photocatalytic efficiency, which was about 4.0 and 20.0 times higher than that of bare g-C3N4 and CdWO4 under visible light irradiation, respectively. Significantly, the g-C3N4/CdWO4 composites exhibited better stability even after four successive cycles for TC degradation under visible light irradiation. Based on the active radical trapping and electron spin resonance (ESR) experiments, the possible mechanism of enhancing photocatalytic activity under visible light irradiation (λ > 420 nm) was proposed, to lead to further improvement in environmental remediation.
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