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 TiO 2 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 TiO 2 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 TiO 2 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 1

Fingerprint

Azo dyes
dyes
Salts
degradation
salts
Degradation
Adsorption
adsorption
augmentation
Electric lamps
inhibitors
luminaires
Negative ions
Dyes
anions
trends

ASJC Scopus subject areas

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

Cite this

Effects of salt and pH on sonophotocatalytic degradation of azo dye reactive black 5. / Son, Younggyu; Cho, Eunju; Lim, Myunghee; Khim, Jeehyeong.

In: Japanese Journal of Applied Physics, Vol. 49, No. 7 PART 2, 07HE05, 01.07.2010.

Research output: Contribution to journalArticle

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