Trapping and decomposing of color compounds from recycled water by TiO2 coated activated carbon

Bo Zhu, Linda Zou

Research output: Contribution to journalArticlepeer-review

55 Scopus citations

Abstract

Five types of commercially available activated carbons (ACs) were coated with TiO2 nanoparticles prepared using a sol-gel method. Color and trace organics remaining in the actual treated effluent were adsorbed by TiO2 coated ACs. The absorbed organic compounds were then decomposed using a photocatalytic process, and the ACs were regenerated for reuse. The efficiency of the process was assessed by the characterization of true color and A254 (the organics absorption at the wavelength of 254 nm) at the beginning and the end of the experiment. The effects of UV light source, UV irradiation time, hydrogen peroxide and ultrasound on the efficiency of photocatalytic regeneration were also investigated. Significant differences in the efficiency were observed between uncoated ACs and TiO2 coated samples. Among the 5 types of ACs tested, AC-3, AC-4 and their coated ones achieved better efficiency in color and A254 removal, with around 90% or more color and A254 being removed within 1 h of treatment. The data obtained in this study also demonstrated that the photocatalytic process was effective for decomposing the adsorbed compounds and regenerating the spent TiO2/AC-3. Finally, it was found that this regeneration process could be greatly enhanced with the assistance of H2O2 and ultrasound by reducing the required regeneration time.

Original languageBritish English
Pages (from-to)3217-3225
Number of pages9
JournalJournal of Environmental Management
Volume90
Issue number11
DOIs
StatePublished - Aug 2009

Keywords

  • Activated carbon
  • Adsorption
  • Color removal
  • Photocatalytic regeneration
  • Titanium dioxide
  • Water reuse

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