Research article

Chemistry Central Journal

, 6:100

Open Access This content is freely available online to anyone, anywhere at any time.

Interactions between photodegradation components

  • Yadollah AbdollahiAffiliated withMaterial Synthesis and Characterization Laboratory, Institute of Advanced Technology, Universiti Putra Malaysia Email author 
  • , Azmi ZakariaAffiliated withMaterial Synthesis and Characterization Laboratory, Institute of Advanced Technology, Universiti Putra Malaysia Email author 
  • , Khamirul Amin MatoriAffiliated withMaterial Synthesis and Characterization Laboratory, Institute of Advanced Technology, Universiti Putra Malaysia
  • , Kamyar ShameliAffiliated withDepartment of Chemistry, Faculty of Science, Universiti Putra Malaysia
  • , Hossein JahangirianAffiliated withDepartment of Chemistry, Faculty of Science, Universiti Putra Malaysia
  • , Majid RezayiAffiliated withDepartment of Chemistry, Faculty of Science, Universiti Putra Malaysia
  • , Tahereh AbdollahiAffiliated withMaterial Synthesis and Characterization Laboratory, Institute of Advanced Technology, Universiti Putra Malaysia

Abstract

Background

The interactions of p-cresol photocatalytic degradation components were studied by response surface methodology. The study was designed by central composite design using the irradiation time, pH, the amount of photocatalyst and the p-cresol concentration as variables. The design was performed to obtain photodegradation % as actual responses. The actual responses were fitted with linear, two factor interactions, cubic and quadratic model to select an appropriate model. The selected model was validated by analysis of variance which provided evidences such as high F-value (845.09), very low P-value (<.0.0001), non-significant lack of fit, the coefficient of R-squared (R2 = 0.999), adjusted R-squared (Radj 2 = 0.998), predicted R-squared (Rpred 2 = 0.994) and the adequate precision (95.94).

Results

From the validated model demonstrated that the component had interaction with irradiation time under 180 min of the time while the interaction with pH was above pH 9. Moreover, photocatalyst and p-cresol had interaction at minimal amount of photocatalyst (< 0.8 g/L) and 100 mg/L p-cresol.

Conclusion

These variables are interdependent and should be simultaneously considered during the photodegradation process, which is one of the advantages of the response surface methodology over the traditional laboratory method.

Keywords

Cross-product effects Modeling Multivariate Photocatalyst Photodegradation Variable-interaction ZnO