Photocatalytic degradation of an artificial sweetener (Acesulfame-K) from synthetic wastewater under UV-LED controlled illumination

Zhao Wang, Giang Nguyen Song Thuy Thuy, Varsha Srivastava, Indu Ambat, Mika Sillanpää

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)

Abstract

The photocatalytic degradation of an artificial sweetener, acesulfame-K (ACE) was investigated using an ultraviolet light emitting diode (UV-LED) based irradiation in presence of titanium dioxide (TiO2), zinc oxide (ZnO), hydrogen peroxide (H2O2), peroxomonosulfate (PMS, HSO5) and peroxodisulfate (PDS, S2O82−). The pH of ACE solution showed significant effect on the degradation of ACE. It was observed that low pH value enhanced the ACE degradation rate. After 120 min by UV-LED/TiO2 treatment, the degradation of ACE reached up to 90%, while in UV-LED/ZnO, UV-LED/H2O2, UV-LED/PMS, and UV-LED/PDS degradation rate were found to be 63%, 87%, 76% and 86% respectively. PMS and PDS both oxidant showed good results without the generation of any secondary sludge like other heterogeneous catalysts. The present study showed that in presence of catalysts and oxidants, UV-LED illumination significantly enhanced the degradation rate of ACE in comparison to direct photolysis by UV-LED. Possible degradation pathway of ACE was determined by gas chromatography-mass spectrometry (GC–MS) which confirmed the ACE degradation by generation of three byproducts.

Original languageEnglish
Pages (from-to)206-214
Number of pages9
JournalProcess Safety and Environmental Protection
Volume123
DOIs
Publication statusPublished - Mar 2019
Externally publishedYes

Keywords

  • Acesulfame-K
  • Artificial sweetener
  • Photocatalytic
  • UV-LED

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • General Chemical Engineering
  • Safety, Risk, Reliability and Quality

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