Preparation of the AC/TiO2 Composite Particles in Normal Temperature and Degradation of TNT

Abstract

AC/TiO2 composite particles were prepared by sol-gel method in normal temperature. Three kinds of particles were obtained by adding Phytic Acid (ab. PA), Benzoyltrifluoroacetone (ab. BTA) and SnCl4 during the preparation. The photo catalytic activity and adsorptive capability of different particles were compared. Raman analysis showed TiO2 grain on the surface of the AC carrier was anatase. FE-SEM photos showed particles with PA were homogeneously coated by TiO2, but more fine TiO2 particles were formed with BTA. The results showed that the adding of PA and BTA helped to get fine grains. The degradation ratio of the TNT solution showed that the photo catalyses activity and adsorptive capability of all composite particles were higher than that of single AC, and the accumulated degradation ratio of TNT solution reached 99.3 % (repeated by 20 times). The degradation of single AC to TNT solution is thought mainly by physical adsorption, but for other composite particles the degradation is by both of the adsorption and photo catalysis. The interface between AC carrier and TiO2 crystal may be affected by PA or BTA, and helping to form synergic effect of AC and TiO2.