Persulfate-assisted photocatalytic degradation of eriochrome black T using UV/TIO2/S2O8 2- system: Modeling, analysis, and optimization using response surface methodology

Author

Ninna Felichi Abner Bugay, De La Salle University, ManilaFollow
Agatha Marie Acerbo Subagan, De La Salle University, ManilaFollow

Date of Publication

12-12-2023

Document Type

Bachelor's Thesis

Degree Name

Bachelor of Science in Biochemistry

Subject Categories

Biochemistry | Chemistry

College

College of Science

Department/Unit

Chemistry

Thesis Advisor

Eric R. Punzalan

Defense Panel Member

Aldrin P. Bonto
Searle S. Duay

Abstract/Summary

The industrial use of dyes in coloring fabrics, food, and cosmetics has resulted in an alarming contamination of water as its effluents retain a large percentage of the dye used. Treatment of dye-contaminated water however proves to be difficult especially when dealing with azo dyes whose azo structures particularly make it resistant to chemical processes. A strategic approach therefore must be employed in removing azo dyes from wastewater. In this study, a binary system, UV/TiO₂/S₂O₈ ^2- , was investigated for its efficiency in degrading Eriochrome Black T (EBT), an azo dye that presents wide commercial and industrial uses. Initially, photodegradation of EBT were screened using UV/TiO₂, UV/PS, and UV/TiO₂/PS to determine the most efficient system. The binary system demonstrated to have the highest degradation of 66.19% in aqueous solution. Three operating conditions for the binary system were optimized via response surface methodology (RSM). These were pH, TiO₂ dosage, and PS concentration for which a Box-Behnken matrix was designed. This mapped out the effect of different working parameter values on degradation efficiency. Statistical analysis through ANOVA showed that pH (P=0.0000) and TiO2 (P=0.0016) significantly affect degradation efficiency. Moreover, there occurs a significant interaction between PS and TiO₂ (P=0.0639) at alpha =0.10 implying that the approach of the binary system in EBT degradation involve a combined effect from the individual mechanisms of the catalyst and the oxidant. Response surface optimization further revealed that within the ranges evaluated in this study, complete removal of EBT through the binary system can be achieved with the following conditions: pH 3, high TiO₂ dosage of 2.0 g/L, and low PS concentration of 12.02 ppm.

Abstract Format

html

Language

English

Format

Electronic

Keywords

Photocatalysis; Titanium dioxide; Persulfates; Response surfaces (Statistics)

Recommended Citation

Bugay, N. A., & Subagan, A. A. (2023). Persulfate-assisted photocatalytic degradation of eriochrome black T using UV/TIO2/S2O8 2- system: Modeling, analysis, and optimization using response surface methodology. Retrieved from https://animorepository.dlsu.edu.ph/etdb_chem/44

Upload Full Text

wf_yes

Embargo Period

12-11-2024