光降解
刚果红
材料科学
光催化
介电谱
带隙
分析化学(期刊)
光电流
光化学
电化学
吸附
化学
光电子学
电极
物理化学
有机化学
催化作用
作者
H. Boulahbel,M. Benamira,F. Bouremmad,N. Ahmia,S. Kiamouche,H. Lahmar,Abdelhafid Souici,M. Trari
标识
DOI:10.1016/j.inoche.2023.110921
摘要
This work is dedicated to the investigation of NiFe2O4, prepared by sol gel auto-combustion method using glycine as fuel, to degrade a hazardous dye (Congo red) under sunlight irradiation. TiO2-NiFe2O4 Z‐scheme has constructed via solid dispersion technique to improve the photoactivity by decreasing the recombination of electron/hole (e−/h+) pairs. The photocatalysts are characterized by X-ray diffraction, Fourier Transform infrared spectroscopy and Scanning electronic microscopy with integrated EDX. The optical characterization indicates a direct transition of NiFe2O4 with the band gap (Eg) of 1.64 eV, and an indirect transition for TiO2 (Eg = 3.21 eV). Electrochemical characterization is used to determine the flat band potential (Efb) using the Mott-Schottky plot of the interfacial capacitance, which confirmed the p and n type behavior of NiFe2O4 (Efb = +0.05 VSCE) and TiO2 (Efb = +0.31 VSCE), respectively. Electrochemical impedance spectroscopy (EIS) shows that NiFe2O4 has a low charge transfer resistance (950 Ω cm2) smaller than that of TiO2. The kinetics of Congo red adsorption is well fitted by a pseudo-second order model. The photodegradation tests confirm that p-NiFe2O4/n-TiO2 hetero-structure facilitates the charge separation of photogenerated electrons and holes by reducing the recombination of (e−/h+) pairs. This increases the overall efficiency of the photocatalytic process, which reaches 97 % of Congo red oxidation after 180 min for the composition (p-NiFe2O4/n-TiO2 (0.75/0.25)).
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