직/편성물 염색

Photoassisted Degradation of Dye Pollutants. 3. Degradation of the Cationic Dye Rhodamine B in Aqueous Anionic Surfactant/TiO(2) Dispersions under Visible Light Irradiation: Evidence for the Need of Substrate Adsorption on TiO(2) Particles.

  • 출판일1999.06
  • 저자
  • 서지사항
  • 등록일 2016.11.02
  • 조회수 279
Experiments compared the titanium oxide photosassisted degradation of the cationic dye rhodamine B (RhB) in aqueous dispersions with and without the anionic surfactant sodium dodecylbenzenesulfonate (DBS). RhB degraded slowly in dispersions without DBS. The process was pH independent. DBS adsorbed strongly on the TiO(2) particles and significantly accelerated RhB degradation. Degradation rates decreased as pH increased in DBS dispersions due to variations in RhB adsorption with changes in TiO(2) particle charge. Zeta potentials of the particles showed that DBS significantly enhanced RhB adsorption, Results confirm that preadsorption on the surface of TiO(2) particles is required for efficient photodegradation of RhB under visible light irradiation. 25 refs.
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