钴
X射线光电子能谱
过硫酸盐
表面光电压
光化学
电子顺磁共振
材料科学
化学
激进的
无机化学
核化学
催化作用
光谱学
化学工程
有机化学
核磁共振
工程类
物理
量子力学
作者
Tingting Pan,Yiming Tang,Yuxin Liao,Jiacheng Chen,Yaping Li,Jing Wang,Laisheng Li,Xin Li
标识
DOI:10.1016/j.mcat.2023.113527
摘要
Tetracycline antibiotics pose a significant threat to environmental sustainability and human health due to their high concentration in water and soil beyond safety limits. In this study, we developed a BiVO4 photoelectrode modified with cobalt-phosphate cocatalyst hybrid nanocomposites to degrade tetracycline efficiently. The crystal structures of the composites and the chemical valence of the ions were characterized by X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The photocurrent generated from BiVO4/Co-Pi under visible light irradiation (λ ≥ 420 nm) was 1.99 mA/cm2, which was 10.5 times higher than that from pristine BiVO4 film. The carriers’ dynamics were investigated by surface photovoltage spectroscopy (SPV) and transient photovoltage spectroscopy (TPV). BiVO4/Co-Pi demonstrated a 62.6% degradation rate of tetracycline within 60 min, which increased to 95.3% after adding peroxomonosulfate (PMS). Co-Pi cocatalyst facilitated charge separation and acted as the hole acceptor, thereby improving the degradation activity. Based on electron spin resonance (ESR) analysis, holes were identified as the dominant oxidizing species in the system. The activated Cobalt-phosphate cocatalyst along with the photogenerated-electrons facilitated the cobalt cycle process and generated sulfate radicals (•SO4−) via PMS activation, leading to efficient tetracycline degradation.
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