Photocatalytic degradation of Congo Red by hydrothermally synthesized nanocrystalline TiO2 and identification of degradation products by LC-MS

ERDEMOĞLU S., Aksu S. K., Sayilkan F., İZGİ B., Asilturk M., Sayilkan H., ...More

JOURNAL OF HAZARDOUS MATERIALS, vol.155, no.3, pp.469-476, 2008 (SCI-Expanded) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 155 Issue: 3
  • Publication Date: 2008
  • Doi Number: 10.1016/j.jhazmat.2007.11.087
  • Journal Name: JOURNAL OF HAZARDOUS MATERIALS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.469-476
  • Keywords: Congo Red, photocatalytic degradation, TiO2, degradation products, LC-MS, ADVANCED OXIDATION, AZO-DYES, EFFICIENCY, POWDER, WATER
  • Bursa Uludag University Affiliated: Yes

Abstract

Degradation of Congo Red (CR) dye in aqueous solutions was investigated by means of photocatalysis of TiO2 which was hydrothermally synthesized at 200 degrees C in 2 h, in anatase phase with 8 nm crystallite size. Efficiency of TiO2 in photocatalytic degradation under visible irradiation was studied by investigating the effects of amount of TiO2, irradiation time, initial CR concentration and pH. It was found that complete decolorization is achieved within 30 min of irradiation. Effects of nitrate and sulphate ions and humic acid on the degradation were also tested. The results were compared with Degussa P-25 TiO2 at the same degradation conditions. Degradation products were detected using LC-MS technique. The probable pathways for the formation of degradation products were proposed. (C) 2008 Published by Elsevier B.V.