Chinese Journal of Catalysis

Chinese Journal of Catalysis ›› 2010, Vol. 31 ›› Issue (10): 1221-1226.DOI: 10.1016/S1872-2067(10)60115-5

• Research papers • Previous Articles     Next Articles

Preparation of Cost-Effective TiO2-Outerloaded Porous Lava Composites Using Supercritical CO2 and Their Photocatalytic Activity for Methylene Blue Degradation

MA Minyuan, LI Youji*, CHEN Wei, LI Leiyong   

  1. College of Chemistry and Chemical Engineering, Jishou University, Jishou 416000, Hunan, China
  • Received:2010-10-25 Online:2010-10-25 Published:2014-03-04

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Abstract: Cost-effective TiO2-outerloaded lava composites (TOLs) were prepared using supercritical CO2 and sealing lava as well as tetrabutyl titanate as a support and a precursor, respectively. The important factors affecting methylene blue (MB) oxidation efficiency were investigated including the initial concentration of MB, the pH, and catalyst concentration. The results show that TOLs have a higher degradation efficiency than pure TiO2 and TiO2-loaded lava composites (TLLs) because of the high adsorption capacity of MB and the small crystalline size of the TiO2 particles in addition to a synergetic effect for adsorption and photocatalytic degradation. The optimum conditions were a MB concentration of 1.5 mg/L at pH 8 with a TOLs concentration of 6.8 mg/L for the fastest MB degradation. Additionally, the used TOLs retained high activity for MB photocatalytic degradation.

Key words: titania, porous lava, sol-gel process, photocatalysis, methylene blue, supercritical carbon dioxide