In this paper, the experimental design methodology was employed for modeling and optimizing the operational parameters of the photocatalytic degradation of a binary dye solution using a fixed photocatalytic compound. The compound used was modified graphite electrode (GE) with graphene oxide (GO) on which TiO2 nanoparticles were immobilized. GO nanoparticle was deposited on graphite electrode (GO-GE) using electrochemical approach. TiO2 nanoparticles were immobilized on GO-GE by solvent evaporation method. A binary solution containing mixture of methylene blue (MB) and acid red 14 (AR14) was chosen as dye model. The degradation intermediates were detected and analyzed using gas chromatography. Effect of different factors on the photocatalytic decolorization efficiency was investigated and optimized using response surface methodology (RSM). The obtained results indicated that the prepared TiO2-GO-CE can decolorize MB with high efficiency (93.43%) at pH 11, dye concentration of 10 mg/L and 0.04 g of immobilized TiO2 on the GO fabricated plates after 120 min of photocatalytic process. It was demonstrated that by modifying GE with GO the stability of the electrode was remarkably enhanced. The ANOVA results (R2 = 0.97 and P value <0.0001 for MB, R2 = 0.96 and P value <0.0001 for AR14) and numerical optimization showed that it is possible to make good prediction on decoloration behavior and save time and energy with less number of experiments using design of experiments (DoE) like the RSM.
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The author thank to Amirkabir University of Technology for all the supports throughout this study.
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• Photocatalytic degradation of binary dye solution using TiO2-GO-GE.
• Binary solution was consist of two different dyes including AR14 and MB.
• RSM was used to examine effect of independent factors on dye removal as response.
• The degradation intermediates were detected and analyzed using gas chromatography method.
• Stability and adsorption tests were employed to enhance photocalytic degradation of MB using GO.
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Akerdi, A.G., Bahrami, S.H. & Pajootan, E. Modeling and optimization of Photocatalytic Decolorization of binary dye solution using graphite electrode modified with Graphene oxide and TiO2. J Environ Health Sci Engineer (2020). https://doi.org/10.1007/s40201-019-00437-z
- Modified graphite electrode
- Binary dye solution
- RSM optimization
- Photocatalytic dye degradation