Optimization of diazo dye disappearance by the UV/H2O2 process using the Box–Behnken design

Abstract

The purpose of this study was to apply the experimental Box–Behnken design (BBD) to evaluate the effect and, therefore, the optimal values of three chosen factors on the efficiency of the UV/H2O2 process to decolorize Ponceau S (PS) aqueous solutions. The factors studied at three levels were the irradiated volume of dye solution, the dye solution turbidity and the H2O2 dosage. The equations generated, analysis of variance (ANOVA), contour plots and response surface plots were used to analyze the relationship between independent variables and the outcomes of experiments. The fitted model was significant, with an adjusted coefficient of determination (adj-R2 = 0.9835). The results showed that factors such as H2O2 dosage and irradiated volume were the main parameters that affected the decolorization efficiency of the PS aqueous solution, while the turbidity had a slight effect on the response. In addition, significant values were obtained for irradiated volume and H2O2 dosage interaction and square terms of all studied factors. Furthermore, the optimal conditions for decolorization of the PS aqueous solution were found to be an irradiated volume of 257.59 mL, a turbidity of 13 NTU and an H2O2 dosage of 1.76 mM.

Recent Achievements in Dyes Removal Focused on Advanced Oxidation Processes Integrated with Biological Methods

“…Measurements of cytotoxicity, mutagenicity and phytotoxicity changes, proposal of degradation mechanism, comparison of different UV sources [80][81][82][83][84][85] Photocatalytic oxidation Synthesizing nanoparticles, efficient under visible light or difunctional catalysts, green methods of catalyst synthesis [86][87][88][89][90][91]…”

Photocatalytic degradation of a diazo-dye in artificial seawater matrix: Optimization of UV/H2O2 process on the Ponceau S decolorization by using central composite design

“…The three-dimensional (3-D) response surface plots and the contour plots were conspired to measure and interpret the individual and the interaction effect of the independent factors on the response. The responses plotted when two factors changed but the other factor is fixed at its central level [23]. They assist in determining the optimal experimental factors and quantifies the relationship between the input factors and response of interest as shown in Fig.…”

Theoretical study of Ponceau S oxidation using the electro-Fenton process under optimal operational conditions

“…8 Depending on the nature and extent of the pollution, different processes can be employed for the purication of such effluents. Advanced oxidation processes (AOPs) are considered as high-efficiency physical-chemical processes due to their thermodynamic viability and capability to degrade or even mineralize a wide range of contaminants via the participation of free radicals, 9,10 mainly HOc hydroxyl radicals. 11,12 The electro-Fenton (EF) process is a potentially effective AOP for treating several kinds of effluents.…”