Shishu Sun,Tianyi Sun,Dashuai Zhang,Jinrui Liu,Liying Ren,Chuilong Chen,Wei Yao,Zaifeng Shi
In this paper, the synthesis, characterization, and photocatalytic performance of CuNi/TiO 2-x composites in the degradation of antibiotic Norfloxacin (NOR) under visible light were investigated. Compared to conventional TiO 2 , the composite catalyst demonstrated superior photocatalytic activity by introducing CuNi nanoparticles and oxygen vacancy in TiO 2 . The oxygen vacancy defect in titanium dioxide crystal reduced the band gap energy. In addition, the incorporation of Cu nanoparticles leveraging Surface Plasmon Resonance (SPR) and Ni nanoparticles as electron traps further markedly enhanced the electron-hole pair separation efficiency and solar energy utilization, catalyzing NOR degradation efficiently. Electron Spin Resonance (ESR) confirmed the generation of reactive oxygen species, which was pivotal to the NOR degradation. This study underscores the potential of bimetallic composites for environmental remediation, particularly in treating antibiotic-laden wastewater.
Shishu Sun,Tianyi Sun,Dashuai Zhang,Jinrui Liu,Liying Ren,Chuilong Chen,Wei Yao,Zaifeng Shi
In this paper, the new CNQDs/CuNi/TiO 2-x composites were prepared successfully for the efficient photocatalytic degradation of tetracycline hydrochloride (TCH) under visible light. The CNQDs/CuNi/TiO 2-x composite, which combined carbon nitride quantum dots (CNQDs) and bimetallic CuNi nanoparticles with defective TiO 2-x , showed excellent photocatalytic properties. The upconversion property of CNQDs transformed lower-energy light into higher-energy photons, broadening the light absorption into the visible spectrum. Moreover, the CuNi nanoparticles enhanced charge carrier dynamics through surface plasmon resonance (SPR) effects, improving the photogenerated electron-hole separation efficiency. Under optimal conditions (pH = 9), the CNQDs/CuNi/TiO 2-x composite with 2 % CNQDs achieved the highest degradation efficiency. When the initial TCH concentration was 10 mg/L and the catalyst concentration was 200 mg/L, the degradation efficiency of TCH exceeded 95 % within 60 min. The composite exhibited superior photocatalytic performance and offered the optimal balance of light absorption and charge separation. This research advances the development of sustainable and highly effective photocatalytic materials, providing a promising approach for wastewater treatment and environmental purification.
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