Bo He,Zixuan Zhao,Lixian Song,Weibao Liu,Ying Yang,Jiangwei Shang,Xiuwen Cheng
The degradation of carbamazepine (CBZ) by activated peroxymonosulfate (PMS) using the (3R + 2H)-CuFeO 2 nanocomposite photocatalyst was investigated in this work. The (3R + 2H)-CuFeO 2 were prepared by hydrothermal method at 160°for 15 h utilizing ferrous sulphate heptahydrate (FeSO 4 ·7H 2 O) and copper (II) sulphate (CuSO 4 ·5H 2 O) as raw materials. Meanwhile, the (3R + 2H)-CuFeO 2 was characterized and analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM), isothermal nitrogen adsorption (BET), and X-ray energy spectroscopy (EDS). The best removal effectiveness was 85.96% when critical factors such as the starting pH value, catalyst dosage, and PMS quantity were turned. The action of anions was then investigated further. The high catalytic efficiency was due to the synergistic impact of Fe 3+ /Fe 2+ and Cu 2+ /Cu + redox cycles. The plausible CAZ breakdown routes were postulated based on the results of the liquid chromatograph-mass spectrometer (LC-MS). Finally, we have studied the most probable of cation migration by the 3DBVSMAPPER program and BVEL calculation concept to correlate the structural characteristics of both materials and their ionic conductivity . The formed channel shows the uniform transport of ions, which can optimize the solid–liquid interface, hinder the influence of water molecules on the material, and protect the material.
Dingfeng Yang,Hongzheng Pu,Peng Dai,Wen Jiang,Yuanxue Yi,Tao Zhang,Shuming Zhang,Xichuan Guo,Yuanyuan Li
A systematic evaluation of enhancing photocatalysis via aliovalent cation doping is conducted. Cation In3+, being p-type-doped, was chosen to substitute the Sn site (Sn4+) in Li2SnO3, and the photodegradation of 2,4-dichlorophenol was applied as a model reaction. Specifically, Li2Sn0.90In0.10O3 exhibited superior catalytic performance; the photodegradation efficiency reached about 100% within only 12 min. This efficiency is far greater than that of pure Li2SnO3 under identical conditions. Density functional theory calculations reveal that introducing In3+ increased the electron mobility, yet decreased the hole mobility, leading to photogenerated carrier separation. However, photoluminescence and time-resolved photoluminescence suggest that In3+ induced nonradiative coupling in the matrix, reducing the photogenerated carrier separation ratio compared with that of Li2SnO3. The optical band gap of Li2Sn0.90In0.10O3 was almost unchanged compared with that of Li2SnO3 via ultraviolet–visible absorption. The increased photocatalytic efficiency was ascribed to the lower valence band position and enhanced hole concentrations by valence band X-ray photoelectron spectroscopy and electrochemical measurements. Finally, a 2,4-dichlorophenol degradation pathway, an intermediate toxicity assessment, and a photocatalytic mechanism were proposed. This work offers insights into designing and optimizing semiconductor photocatalysts with high performance.
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