Effects of salt and pH on sonophotocatalytic degradation of azo dye reactive black 5

Younggyu Son, Eunju Cho, Myunghee Lim, Jeehyeong Khim

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

The effects of salt and pH on the sonophotocatalytic degradation of azo dye Reactive Black 5 (RB5) were investigated. The applied frequency was 35 kHz, and 254nm UVC lamps and TiO2 were used. At salt concentrations of 0, 50, 500, and 5000 mg/L, salt acted as an inhibitor or a OH radical scavenger under neutral pH condition and there was no significant difference in the removal trends for salt-added conditions. Under acidic condition, adsorption of RB5 on the surface of TiO2 was observed before the start of the sonophotocatalytic process and it was revealed that adsorption of RB5, negatively charged dye anions, could be enhanced under acidic condition because the charge of the TiO2 surface was changed from negative to positive at a pH of 6.6. This enhancement under acidic condition was observed during the entire operation time. In the comparison of the pH and salt effects, the enhancement by acidic pH control was larger than the inhibition by the effect of salt as a radical scavenger.

Original languageEnglish
Article number07HE05
JournalJapanese journal of applied physics
Volume49
Issue number7 PART 2
DOIs
Publication statusPublished - 2010 Jul

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

Fingerprint Dive into the research topics of 'Effects of salt and pH on sonophotocatalytic degradation of azo dye reactive black 5'. Together they form a unique fingerprint.

  • Cite this