用钛基锑-锡氧化物涂层电极研究橙黄G的电化学降解 第二部分——橙黄G的电催化氧化及其机理

Study on electrochemical degradation of Orange G by titanium-based antimony and tin oxide coated electrode Part Ⅱ——Electrocatalytic oxidation of Orange G and the mechanism

考察了不同工艺条件下Ti/Sb–SnO2电极对橙黄G去除效果的影响。结果表明:当电流密度为4.8mA/cm2,橙黄G初始质量浓度为40mg/L,氯化钠浓度为0.35mol/L,pH=7时,室温下电解8min,橙黄G的去除率达到90.2%,其降解过程符合一级反应动力学模型,速率常数为0.06331min-1。通过考察橙黄G在NaCl和Na2SO4两种电解质中的去除效果,推导其降解机理,并采用紫外–可见(UV–Vis)吸收光谱和高效液相色谱–质谱联用仪(HPLC–MS)鉴定了中间产物。

The effects of process conditions on the removal of Orange G by Ti/Sb-SnO2 electrode were studied. The results showed that the removal rate of Orange G reaches 90.2% after electrolysis in a 0.35 mol/L NaCl solution at room temperature, pH 7 and current density 4.8 mA/cm2 for 8 min when the initial mass concentration of Orange G is 40 mg/L. The degradation of Orange G in the above system follows the first-order reaction kinetics with a rate constant of 0,063 31 min-1, The degradation mechanism was deduced by examination of the removal efficiency of Orange G in NaCl and Na2SO4 electrolytes, respectively. The intermediate products were analyzed by high-performance liquid chromatography-mass spectroscopy （HPLC-MS）technique and ultraviolet-visible （UV-Vis） absorption spectroscopy.