Influence of parameters on the photocatalytic degradation of phenolic contaminants in wastewater using TiO2/UV system

Rijuta G. Saratale, Hyun S. Noh, Ji Y. Song, Dong S. Kim

Research output: Contribution to journalArticlepeer-review

25 Scopus citations

Abstract

The photocatalytic degradation of phenol in aqueous suspension using commercial TiO2 powder (Degussa P-25) irradiated with UV light was investigated. Photodegradation was compared using a photocatalyst (TiO 2 alone), direct photolysis (UV alone) and TiO2/UV in a single batch reactor with mercury lamp irradiation. The study focused on the influence of various operating parameters on phenol treatment efficiency, including catalyst dosage, initial concentration of phenol, temperature, pH and change in pH were systematically investigated. The highest phenol degradation rate was obtained at pH 9.0, temperature 60°C and catalyst dose of 2 μg L-1 with higher mineralization efficiency (in terms of TOC reduction). Experimental results showed that under optimized conditions the phenol removal efficiency was 98% and 100% for the TiO2/UV and TiO2/UV/H2O2 system, respectively. No significant effect on addition of chloride and metal ions was observed. Photodegradation of phenol followed first-order kinetics. To test whether the phenol removal was possible for wastewater using a TiO2/UV system, the degradation study was conducted with the real obtained wastewater. The removal of phenol from obtained wastewater and the synthetic wastewater containing phenol was comparable. The TiO2/UV system developed here is expected to be useful for the treatment of wastewater containing phenol.

Original languageEnglish
Pages (from-to)1542-1552
Number of pages11
JournalJournal of Environmental Science and Health - Part A Toxic/Hazardous Substances and Environmental Engineering
Volume49
Issue number13
DOIs
StatePublished - 10 Nov 2014

Keywords

  • pH
  • phenol
  • Photocatalytic degradation
  • TOC
  • wastewater

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