Photodegradation of Toluene by Composite Photocatalysts of Organobentonites and TiO2: Influences of Carbon Chain Length

Xia Sheng Chen; Kun Yang Chen; Ge Bai; Jian Lei Liu; Mei Jiao Lin; Xue You Shen

doi:10.4028/www.scientific.net/AMR.233-235.1958

Paper Titles

Effect of Gas Injection with Multi-hole Orifices on Bubble Behavior during Metal Refining
p.1940

Preparation and Characterization of CdTe/SiO₂ Composite
p.1946

The Analysis of Plane Flat Lap Interface End of Orthotropic Bi-Material
p.1950

Preparation and Characterization of Helical Structure ZnS by Solvothermal Method
p.1954

Photodegradation of Toluene by Composite Photocatalysts of Organobentonites and TiO₂: Influences of Carbon Chain Length
p.1958

Rheological Properties of Sodium Dodecyl Sulphate-Based Supramolecules Hydrogel Induced by Aluminum Ion
p.1966

Research on Adsorption of Pb²⁺ on to Microspheres Prepared by Rectorite and Humic Acid
p.1972

Preparation of Double-Shelled BaTiO₃ Composite Hollow Microspheres by Template Method
p.1981

Effect of Packaging Conditions on Physiology Quality and Shelf-Life of Fresh-Cut Kiwifruit
p.1985

HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 233-235Photodegradation of Toluene by Composite...

Photodegradation of Toluene by Composite Photocatalysts of Organobentonites and TiO₂: Influences of Carbon Chain Length

Abstract:

Composite photocatalysts, prepared by mechanical grinding TiO₂ with bentonite/ organobentonite, were applied in the dynamic photodegradation of gaseous toluene. A substrate enriched environment surround the loaded TiO₂ was formed by the adsorption of the added sorbents, leading to an increase in the degradation rate. The performance of composite catalysts was quite different in the initial and the long-term period of photocatalysis. The differences could be attributed to the adsorption properties of added sorbents related to adsorbility, hydrophilicity and diffusion feasibility, etc. The longer alkyl-chain of organobentonite formed a better partition phase resulting in an ideal adsorption capacity. However, as the alkyl-chain length increased, the diffusion path was segmentally clogged which seriously hindered the photocatalysis in the initial period. Although the adsorption capacity of original bentonite was quite small, the facility of diffusion changed it into the best performer in the initial period. Organobentonite with relatively short alkyl-chain conceived a little smaller adsorption capacity than the longer one. Moreover, the former one showed much more trending to diffuse the adsorbed toluene to catalyst. The long-term period of photocatalysis was also affected by the hydrophilicity of catalyst. Hence, the performance of organobentonites added composite catalyst mended a lot in the final degradation rate. Thus, organobentonite as 20DTAB with the advantage of large adsorption capacity and good diffusion feasibility is believed to be a promising carrier of photocatalys.