Application of TiO2/ZnS as a nano photocatalyst for degradation of Acid Red 18 in aqueous media using a central composite design
الموضوعات : Journal of Nanoanalysis
Aref Shokri
1
(Department of chemistry, Faculty of Science, Payamenoor University, Tehran, Iran.)
Mahdi Sanavi Fard
2
(tafresh university)
الکلمات المفتاحية: Central composite design, TiO2/ZnS nano photocatalyst, Co-precipitation method, AR18,
ملخص المقالة :
In this study, through the application of TiO2/ZnS as a novel nano photocatalyst, the degradation of AR18 in synthetic wastewater was explored. The nano photocatalyst was synthesized by the co-precipitation method and characterized by Scanning electron microscopy (SEM), Fourier transfer infrared (FTIR), and X-ray powder diffraction (XRD) techniques. The average size of ZnS/TiO2 nano photocatalyst was 79nm. For experimental design and statistical analysis of each factor including AR18 concentration, pH, catalyst dosage, and treatment time on the degradation rate of AR18 (response) by Central Composite Design (CCD) was used. The analysis of variance (ANOVA) demonstrates a second-order regression model with R2 = 0.9995, adjusted R2=0.9991, and predicted R2=0.9982) for the removal of AR18. The optimum conditions for each operating factor were as the following: AR18 concentration at 30 mg.L-1, catalyst dosage at 1.2 g.L-1, pH at 5, and treatment time at 120 min. In this condition, the actual and predicted AR18 removal was 94% and, 93.07%, respectively.
