Papers by Keyword: Chemical Techniques

Abstract: A LiNH₂/MgH₂ (1:1) complex was prepared by mechanical alloying and the effects of Ti and TiF₃ on the characteristics of hydrogen storage were investigated. It was found that LiMgN and Li₂NH phases exist as the main phases in the LiNH₂/MgH₂ (1:1) complex and that Mg (NH₂)₂ and NH₄HF₂ phases appear when TiF₃ is added. The onset temperature of hydrogen desorption was reduced with increasing mill time, and the hydrogen saturation absorption temperature for the LiNH₂/MgH₂ complex decreased about 30°C with the addition of Ti and TiF₃. Ti and TiF₃ as catalysts are favorable for reducing the dehydrogenation temperature. The addition of TiF₃ can also facilitate the increase of hydrogen desorption for the LiNH₂/MgH₂ (1:1) complex.

Abstract: Present work describes the synthesis of nanocrystalline TiO₂ photocatalyst using sol-gel and solution combustion methods and their characterisation by powder X-ray Diffraction, Diffuse Reflectance Spectroscopy, surface area measurement, FT-IR, FT-Raman, Thermo Gravimetric Analysis, and Transmission Electron Microscopy. Their photocatalytic activity was evaluated by the degradation of two nitro aromatic pollutants, viz. para-nitroaniline (PNA) & meta-dinitrobenzoic acid (DNBA) commonly observed in nitroaromatic plants. Performance of the synthesized catalysts was compared with commercial Degussa P25 sample. The photocatalytic degradation and total mineralization were monitored using UV/VIS spectrophotometer and total organic carbon content analysis respectively. The materials properties such as crystallinity and surface hydroxyl group on the nanocrystalline TiO₂ played crucial role for the total mineralization of the nitroaromatics.