Acta Phys. -Chim. Sin. ›› 2007, Vol. 23 ›› Issue (11): 1803-1807.doi: 10.3866/PKU.WHXB20071128

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Photocatalytic Degradation of Light Fast Scarlet BBN and Surfactant Bicomponents

ZHANG Tian-Yong; FAN Qiao-Fang; ZENG Miao; WANG Zheng; XIA Wen-Juan; CHI Li-Feng   

  1. School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, P. R. China
  • Received:2007-05-07 Revised:2007-06-18 Published:2007-11-01
  • Contact: ZHANG Tian-Yong

Abstract: The photocatalytic degradation of surfactant cetyltrimethylammonium bromide (CTAB) and organic pigment light fast scarlet BBN (barium 4-[(5-chloro-4-methyl-2-sulfophenyl) azo]-3-hydroxy-2-naphthalenecarboxylate, BBN) was investigated using TiO2 as photocatalyst in aqueous solution under ultraviolet light irradiation. Decolorization rate and interaction mechanism of the surfactant and BBN were discussed, and the adsorption model of BBN and surfactant on TiO2 was also shown. The results showed that the degradation of the bicomponents depended on pH and substrate concentration obviously. The alkaline medium was favorable to the degradation of BBN and CTAB. The degradation of the two compounds systemwas faster than individual organic compounds in neutral condition (pH=6.8). The degradation of CTAB was slightly slower than that without BBN in alkaline (pH=9.2). The concentration of CTAB greatly affected the discoloration of BBN. When the concentration of CTAB was 1 cmc, the degradation rates of BBN and CTAB were the fastest. BBN was adsorbed strongly on TiO2 surface, and was preferentially degraded.

Key words: Organic pigment BBN, Surfactant, TiO2, Photocatalysis, Adsorption


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