The decomposition of the persulfate by Fe2+ ions results in the production of oxidative sulfate radical anions. In present study, the oxidative degradation of the basic yellow 28 dye solution was studied by using persulfate and ferrous ions. To obtain maximum mineralization efficiency for aqueous solution of basic yellow 28, Box-Behnken design combined with response surface modeling (RSM). Four independent variables, namely temperature (40-70 ºC), initial concentration of persulfate (4-12 mM), ferrous ion (1-3 mM) and time (2-8 h) were transformed to coded values. Subsequently, it was determined that quadratic model to be the most suitable models to estimate the responses. Analysis of variance (ANOVA) was carried out for quadratic model and was observed the significance of the independent variables and their interactions. The predicted values of the oxidative degradation efficiency were verified to be in good agreement with the experimental values (R2 = 0.9902 and R2adj = 0.9804). Maximum mineralization efficiency 93 % was obtained under following conditions: persulfate concentration 9.87 mM, ferrous ion concentration 1.95 mM, temperature at 65 ºC and time at 8 h for 40 mg/L basic yellow 28 aqueous solution.
过
硫酸盐被 Fe2+ 离子分解后会产生氧化
硫酸根阴离子。本研究利用过
硫酸盐和亚
铁离子对
碱性黄 28 染料溶液的氧化降解进行了研究。为了获得
碱性黄 28 水溶液的最大矿化效率,采用了方框-贝肯设计(Box-Behnken design)与响应面模型(RSM)相结合的方法。四个自变量,即温度(40-70 ºC)、过
硫酸盐初始浓度(4-12 mM)、亚
铁离子(1-3 mM)和时间(2-8 h)被转换为编码值。随后,确定二次模型是估计反应的最合适模型。对二次模型进行了方差分析(ANOVA),并观察了自变量及其交互作用的显著性。经证实,氧化降解效率的预测值与实验值十分吻合(R2 = 0.9902 和 R2adj = 0.9804)。在下列条件下,40 毫克/升
碱性黄 28 水溶液的矿化效率达到 93%:过
硫酸盐浓度 9.87 毫摩尔,亚
铁离子浓度 1.95 毫摩尔,温度 65 ºC,时间 8 小时。