柠檬酸螯合Fe(Ⅲ)活化过硫酸盐降解活性艳红X-3B

Research on the degradation of reactive brilliant red X-3B by citric acid chelated with Fe(Ⅲ)

文章研究了柠檬酸螯合Fe(Ⅲ)活化过硫酸盐体系对水中活性艳红X-3B的降解效果。考察了过硫酸盐浓度、Fe(Ⅲ)/柠檬酸(CA)、pH及阴离子(NO_3^-、NO_2^-、HCO_3^-、Cl^-)对X-3B降解效果的影响,并研究体系中产生自由基的贡献率。结果表明,过硫酸盐浓度为0.2 mmol/L时,X-3B降解率最大;X-3B的降解率随Fe(Ⅲ)/CA增大而增大;pH的增大不利于X-3B的降解;无机阴离子的加入抑制X-3B的降解。·OH和SO_4^(·-)在光解过程中的贡献率分别为58%和31%。

The degradation effect of citric acid chelated Fe （ Ⅲ ） activated persulfate system on reaction brilliant red X-3B has been researched. The effects of the concentration of persulfate, ratio of Fe （Ⅲ）/citric acid （CA）,pH and anions （NO3-,NO2-,HCO3-,CI-） on X-3B degradation have been investigated, and the contribution rate of free radicals produced in the system has been studied. The results show that when the concentration of persulfate is 0.2 mmol/L, the degradation rate of X-3B is the highest. The degradation rate of X-3B increases with the increase of ratio of Fe （ 111 ）/CA. The increase of pH is not advantageous to the degradation of X-3B. The addition of inorganic anions inhibits the degradation of X-3B. The contribution rates of ＇ OH and SO4＂-in the process of photolysis are 58% and 31%, respectively.