苋菜红在掺杂氟的二氧化锡导电玻璃上的电化学降解

THE ELECTROCHEMICAL DEGRADATION OF AMARANTH ON FTO

构建了一套可以实时监测苋菜红降解情况的设备,探讨了苋菜红在掺杂氟的二氧化锡导电玻璃上的电化学降解方法.考察了支持电解质、外加电压、溶液pH、降解时间等因素对染料去除率的影响.结果表明,控制外加电压为6 V,用含0.03 mol.L-1氯化钠为支持电解质(pH 8.0),电解苋菜红溶液(12.0 mg.L-1)10 min后,苋菜红的去除率可达到87%.同时,通过紫外可见吸收光谱仪、荧光光谱仪、总有机碳测定仪等初步探讨了苋菜红的降解行为,其降解符合一级反应的特性,并有部分有机碳转变成为无机碳.

An apparatus for the real-time monitoring of amaranth electrochemical degradation was assembled.The method for the electrochemical degradation of amaranth on FTO conductive glass was discussed.The effect of supporting electrolyte,applied voltage,solution pH,degradation time and other factors on degradation rate was investigated.The results showed that degradation rate of the sunset yellow reached 87%,after amaranth was electrolysed in 0.03 mol · L-1 NaCl（pH 8.0） by 6 V for 10 min.Ultraviolet-visible spectroscopy,fluorescence spectrometry and total organic carbon analysis were used for preliminary investigation of the degradation process.The results show that the standard degradation kinetic process can be described by the first-order reaction,and organic carbon was converted partically to inorganic carbon.