Facile synthesis of CaWO4 nanoparticles incorporated on porous carbons with improved photocatalytic degradation of tetracycline
2022
Sun, Haodong | Xiao, Zuoyi | Zhao, Zhenyu | Huang, Yingjie | Zhai, Shangru | An, Qingda
The construction of an efficient and recyclable photocatalyst for the degradation of antibiotics is still a challenge. In this work, we successfully synthesized porous carbon-supported CaWO₄ nanoparticles (CaWO₄ @C) by solidifying sodium alginate (SA) mixed with Na₂WO₄ by Ca²⁺ ions and subsequent high-temperature carbonization. The introduction of porous carbon significantly reduced the size of CaWO₄ particles, increased the specific surface area for mass transport, and improved visible light utilization. The influence factors of photocatalytic activity were extensively explored through photocatalytic degradation of tetracycline (TC). As a result, the optimized CaWO₄ @C exhibited excellent photocatalytic performance with the TC degradation rate of 94.56% after 60-min visible light irradiation. The TC photodegradation rate constant was calculated to be 0.051 min⁻¹, which was 30.19-time higher than the pristine CaWO₄. Besides, the photocatalytic reaction mechanism for degradation of TC was revealed in terms of free radical trapping experiments and electron spin resonance (ESR) techniques.
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