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TiO_2 nanoparticles(NPs)were prepared via the hydrothermal route of TiO_2 xerogel in nitric acid, hydrochloric acid and acetic acid. The physico-chemical properties of the powders were characterized by X-ray diffraction(XRD)and N_2 adsorption desorption techniques. The effects of the different acids on the structure(crystal phase)and texture(primary particle size and porosity)of the TiO_2 powders were explored. Results indicated that acetic acid facilitated the formation and stability of pure anatase phase. On the other hand, nitric acid and hydrochloric acid led to the transformation from anatase to rutile. The catalyst synthesized via the hydrothermal route of TiO_2 xerogel in the low concentration hydrochloric acid solution(Ti-HCl-0.15)had the highest photocatalytic activity than the catalysts obtained in the other two acid solutions. The effects of the different acids were discussed in terms of acid strength, chelating effect and the thermal stability of the adsorbed acidic anions.
TiO 2 nanoparticles (NPs) were prepared via the hydrothermal route of TiO 2 xerogel in nitric acid, hydrochloric acid and acetic acid. The physico-chemical properties of the powders were characterized by X-ray diffraction (XRD) and N 2 adsorption desorption techniques. of the different acids on the structure (crystal phase) and texture (primary particle size and porosity) of the TiO 2 powders were explored. Results indicate that acetic acid facilitated the formation and stability of pure anatase phase. On the other hand, nitric acid and hydrochloric acid to the transformation from anatase to rutile. The catalyst synthesized via the hydrothermal route of TiO 2 xerogel in the low concentration hydrochloric acid solution (Ti-HCl-0.15) had the highest photocatalytic activity than the catalysts obtained in the other two acid solutions The effects of the different acids were discussed in terms of acid strength, chelating effect and the thermal stability of the adsorbed acidic anions.