Optimization for decolorization of azo dye acid green 20 by ultrasound and H2O2 using response surface methodology.
Optimization for decolorization of azo dye acid green 20 by ultrasound and H2O2 using response surface methodology.
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DOI：
10.1016/j.jhazmat.2009.07.146
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发表时间：
2009-12
影响因子：
13.6
通讯作者：
Zhanmei Zhang;Huaili Zheng
中科院分区：
文献类型：
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作者：
Zhanmei Zhang;Huaili Zheng
采用响应面法（RSM）对H2 O2存在下，超声辐射降解酸性绿色20（AG 20）的工艺条件进行了优化。考察了超声功率密度、染料溶液初始pH值和H2 O2浓度3个操作参数对AG 20脱色效果的影响。提出了AG 20脱色的二次模型.方差分析（ANOVA）表明，所提出的二次模型可用于导航的设计空间。该模型与实验结果基本吻合，相关系数R2和Radj 2分别为0.9995和0.9984。超声波功率密度为1.08W/mL、初始pH值为4.85、H2 O2浓度为1.94mM时，AG 20脱色效果最好。在最佳工艺条件下，预测脱色率为96.8%。在最佳条件下进行了脱色实验，脱色率为96.3%，与预测值基本一致。结果表明，基于Box-Behnken设计的响应面法是一种准确可靠的AG 20脱色工艺条件优化方法。
Response surface methodology (RSM) based on Box-Behnken design was successfully applied to the optimization of the operating conditions in decolorization of acid green 20 (AG 20) by ultrasonic irradiation in the presence of H2O2. The effects of three operating variables, ultrasonic power density, initial pH value of dye solution and H2O2concentration on the decolorization efficiency of AG 20 were evaluated. A quadratic model for AG 20 decolorization was proposed. Analysis of variance (ANOVA) indicated that the proposed quadratic model could be used to navigate the design space. The proposed model was approximately in accordance with the experimental case with correlation coefficients R2and Radj2of 0.9995 and 0.9984, respectively. The optimum operating conditions for AG 20 decolorization were found to be 1.08W/mL of ultrasonic power density, 4.85 of initial pH and 1.94mM of H2O2concentration, respectively. The predicted decolorization rate under the optimum conditions determined by RSM was 96.8%. Confirmatory tests were carried out under the optimum conditions and the decolorization rate of 96.3% was observed, which closely agreed with the predicted value. The results confirmed that RSM based on Box-Behnken design was an accurate and reliable method to optimize the operating conditions of AG 20 decolorization.