催化作用
煅烧
罗丹明B
激进的
水溶液
化学
反应速率常数
浸出(土壤学)
无机化学
材料科学
光催化
化学工程
动力学
物理化学
有机化学
土壤水分
土壤科学
工程类
物理
量子力学
环境科学
作者
Yiping Wang,Chao Liu,Yuting Zhang,Weidong Meng,Bin Yu,Shengyan Pu,Donghai Yuan,Fei Qi,Bin Xu,Wei Chu
标识
DOI:10.1016/j.apcatb.2018.04.058
摘要
Sulfate radical-based photo-Fenton (SR-photo-Fenton) reaction, assisted by visible light irradiation, was achieved by CuBi2O4 and its composites with α-Bi2O3 for refractory chemical degradation in aqueous solution. Herein, this catalyst was fabricated by a sol-gel method and the fabrication conditions, including calcination temperature and molar ratio of Cu/Bi, were optimized according to the crystal phase composition, catalytic activity and toxic copper ion leaching. The optimal calcination temperature was 500 °C and molar ratio of Bi to Cu was 2.0. The catalyst containing CuBi2O4 and α-Bi2O3 showed a higher density of surface OH which might be the key surface active site than pure CuBi2O4. The influence of initial solution pH, PMS concentration, catalyst dosage and catalyst reuse on rhodamine B (RhB) degradation was investigated. Importantly, calcination at 500 °C reverted the catalytic activity of catalyst. Results of electron paramagnetic resonance, competitive radical experiments and surface chemical property characterization demonstrated that the reaction mechanism of this novel SR-photo-Fenton reaction is a combination of interface and solution reactions. In the interface reaction, the transfer of photogenerated electron/hole pairs drives the decomposition of PMS to produce SO4− and OH. Furthermore, the cycling of Cu(I)/Cu(II) facilitated effective PMS activation to generate free radical that was responsible for the degradation of RhB. The second order reaction rate constant between RhB and SO4− was determined to be 0.595–6.436 × 1010 M−1 S−1 based on the chemical reaction kinetics of radical, which was a first and important report for SO4− chemistry.
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