PW12/CN@Bi2WO6 composite photocatalyst prepared based on organic-inorganic hybrid system for removing pollutants in water
In the drive toward green and sustainable chemistry in wastewater treatment, it is necessary to explore more efficient and stable photocatalysts to achieve the degradation of antibiotic and reduction of heavy metal ions. To this end, an organic-inorganic hybrid PW 12 /CN@Bi 2 WO 6 composite photocatalyst was prepared: PW 12 /CN composite was prepared by heating H 3 PW 12 O 40 , melamine and phytic acid; PW 12 /CN@Bi 2 WO 6 was synthesized via PW 12 /CN and Bi 2 WO 6 by hydrothermal method. The photocatalytic activity of as-prepared photocatalyst was evaluated by degrading tetracycline hydrochloride (TC) and reducing hexavalent chromium (Cr(VI)) under the simulated xenon light source. The results show the PW 12 /CN@Bi 2 WO 6 composite always maintains high catalytic performance for TC and Cr 6+ and has well cycle stability. After irradiation for 90 and 100 min, the most effective 10%-PW 12 /CN@Bi 2 WO 6 achieved a removal rate of 98.7% for Cr(VI) and 97.5% for TC. Photoluminescence spectroscopy and photoelectrochemical results demonstrate that the charge separation is enhanced for the PW 12 /CN@Bi 2 WO 6 , attributed to the introduction of the organic-inorganic systems to enhance the absorbance of light energy, promote charge transfer and inhibit e − and h + pair recombination. In addition, the free radical scavenging test and electron spin resonance analysis (ESR) test indicate that the main species of action are h + and O 2 − in the photocatalytic oxidation reaction. Further, the mechanism of photocatalysis was proposed by Mott-Schottky. The strategy improving catalytic performance through organic-inorganic hybrid systems provides a new route for the development of photocatalysts.
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