| Title: | Adsorption and degradation of model volatile organic compounds by a combined titania-montmorillonite-silica photocatalyst |
| Author(s): | Chen J; Li G; He Z; An T; |
| Address: | "State Key Laboratory of Organic Geochemistry, Guangdong Key Laboratory of Environmental Resources Utilization and Protection, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China" |
| DOI: | 10.1016/j.jhazmat.2011.03.064 |
| ISSN/ISBN: | 1873-3336 (Electronic) 0304-3894 (Linking) |
| Abstract: | "A series of adsorptive photocatalysts, combined titania-montmorillonite-silica were synthesized. The resultant photocatalysts consisted of more and more spherically agglomerated TiO(2) particles with increasing of TiO(2) content, and anatase was the only crystalline phase with nano-scale TiO(2) particles. With increasing of the cation exchange capacity to TiO(2) molar ratio, specific surface area and pore volume increased very slightly. In a fluidized bed photocatalytic reactor by choosing toluene, ethyl acetate and ethanethiol as model pollutants, all catalysts had relatively high adsorption capacities and preferred to adsorb higher polarity pollutants. Langmuir isotherm model better described equilibrium data compared to Freundlich model. Competitive adsorptions were observed for the mixed pollutants on the catalysts, leading to decrease adsorption capacity for each pollutant. The combined titania-montmorillonite-silica photocatalyst exhibited excellent photocatalytic removal ability to model pollutants of various components. Almost 100% of degradation efficiency was achieved within 120 min for each pollutant with about 500 ppb initial concentration, though the efficiencies of multi-component compounds slightly decreased. All photocatalytic reactions followed the Langmuir-Hinshelwood model. Degradation rate constants of multi-component systems were lower than those for single systems, following the order of toluene |
| Keywords: | Acetates Adsorption Bentonite/chemistry Catalysis Environmental Pollutants/*chemistry/isolation & purification Environmental Restoration and Remediation/*methods Ion Exchange Kinetics *Photochemical Processes/drug effects/radiation effects Silicon Dioxide; |
| Notes: | "MedlineChen, Jiangyao Li, Guiying He, Zhigui An, Taicheng eng Evaluation Study Research Support, Non-U.S. Gov't Netherlands 2011/04/20 J Hazard Mater. 2011 Jun 15; 190(1-3):416-23. doi: 10.1016/j.jhazmat.2011.03.064. Epub 2011 Mar 27" |
