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F-SnO2/GAC粒子电极的制备及其电催化性能
Preparation of F-SnO2/GAC particle electrode and its electrocatalytic performance
以颗粒活性炭（GAC）为载体，通过溶胶-凝胶法制备了经F-掺杂改性的F-SnO2/GAC粒子电极.采用扫描电子显微镜（SEM）、X射线能谱（EDS）、X射线衍射（XRD）、X射线光电子能谱（XPS）、循环伏安曲线（CV）对粒子电极进行了表征.并以罗丹明B（RhB）为目标污染物，考察该粒子电极的电催化性能.结果表明：F-SnO2纳米颗粒均匀分布在GAC的内外表面，且结晶完整；经F-掺杂改性后的SnO2活性组分能够增加反应体系中的转变电荷量，提高电催化活性.当RhB质量浓度为300mg/L、初始pH 3、槽电压为9V、处理30min时，在500℃下煅烧2h的10% F-SnO2/GAC粒子电极对RhB的脱色率和COD去除率达到了97.6%和89.0%.运用电子自旋共振技术（ESR）确定了电催化过程主要是以羟基自由基（·OH）的间接氧化来实现对污染物的去除.
F-SnO2/GAC particle electrode was prepared by sol-gel method using granular activated carbon (GAC) as substrate. Scanning electron microscopy (SEM), Energy dispersive spectrometer (EDS), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and Cyclic voltammetry curve(CV) were used to characterize the particle electrode. And it's electrocatalytic performance was investigated with Rhodamine B (RhB) as the target pollutant. The results showed that:F-SnO2 nanoparticles are uniformly distributed on the inner and outer surfaces of the GAC, and the crystals are intact; the SnO2 active components modified by F- doping can increase the amount of transition charges in the reaction system and improve the electrocatalytic activity. When the mass concentration of RhB was 300mg/L, the initial pH 3, the voltage was 9V and reaction time 30minutes, the decolorization rate and COD removal rate of RhB by 10%F-SnO2/GAC particle electrode calcined at 500℃ for 2h reached 97.6% and 89.0%. Electron spin resonance (ESR) technology has determined the electrocatalytic process mainly by indirect oxidation of hydroxyl radicals (·OH) to remove contaminants.
电催化氧化 / 粒子电极 / 罗丹明B / 羟基自由基(·OH)
electrocatalytic oxidation / hydroxyl radicals (·OH) / particle electrode / Rhodamine B
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