CoFe2O4/TiO2/鳞片石墨粒子电极光电催化降解罗丹明B

采用溶胶-凝胶法制成CoFe2O4/TiO2/鳞片石墨粒子电极，用电子扫描电镜（SEM）、X-射线衍射仪（XRD）和X-射线光电子能谱仪（XPS）对该粒子电极的形貌、晶体结构和元素组成进行分析，并将其应用于罗丹明B（RhB）的光电催化实验；考察电解质浓度、粒子电极投加量、电压、pH和初始浓度等因素对罗丹明B降解的影响，并研究了罗丹明B的光电催化降解动力学。结果表明：光催化和电化学联合作用时，产生协同作用；在电解质Na2SO4溶液浓度为0.03 mol·L-1，粒子电极投加量为6.67 g·L-1，外加电压为8 V，pH为3，反应时间为45 min时，浓度为15 mg·L-1的罗丹明B的去除率达到97.6%；罗丹明B的光电催化降解反应符合假一级动力学模型。

Photoelectrocatalytic degradation of rhodamine B by CoFe2O4/TiO2/flake graphite particle electrode

A CoFe2O4/TiO2/flake graphite composite was synthesized via a sol-gel method,and then was characterized by scanning electron microscopy (SEM),X-ray diffraction (XRD),and X-ray photoelectron spectroscopy (XPS) to analyze its morphology,crystal structure,and elements.The particle electrodes were applied to the photoelectrocatalytic degradation of rhodamine B (RhB).Batch experiments were conducted to investigate the impacts of electrolyte concentration,particle electrode dosage,electrolytic voltage,pH,and initial concentration on RhB degradation.The degradation kinetics under different initial concentrations was also studied.The experimental results showed that the synergetic enhancement effect was produced in the combined photocatalysis and electrocatalysis process,and under the conditions of Na2SO4 concentration of 0.03 mol·L-1,catalyst dosage of 6.67 g·L-1,electrolytic voltage of 8.0 V,initial solution pH of 3,and reaction time of 45 min,the highest removal rate of 15 mg·L-1 RhB was 97.6%.The pseudo-first-order model could correlate well with the results of photoelectrocatalytic degradation kinetics analysis of RhB.