Abstract
The powders of ilmenite structure NiTiO3 were prepared by a modified Pechini process using tetrabutyl titanate and nickel acetate as raw materials, and using citric acid and ethanol as a chelating agent and a solvent respectively. The powder samples were characterized by thermogravimetric and differential thermal analysis (TG-DTA) and X-ray diffraction (XRD). The photocatalytic activity of NiTiO3 under the irradiation of ultraviolet rays (UV) light was evaluated by degrading humic acid (HA) in water as a probe reaction. The possible photodegradation mechanism was studied by the examination of active species ·OH, ·O −2 , and holes (h+) through adding scavengers. The TG-DTA and XRD results indicated that the good crystal structure of ilmenite phase NiTiO3 could be obtained when the Ni-Ti citrate complex was calcined at 600°C. The photocatalytic activity experiments indicated that NiTiO3 had favourable photocatalytic activity under the irradiation of UV light, and the photocatalytic degradation rate of HA reached 95.3% after a 2.5 h reaction with the photocatalyst calcined at 600°C and a photocatalyst dosage of 0.4 g/L. The possible photocatalytic mechanism was deduced that holes (h+) and ·OH radicals are the major reactive active species in the photocatalytic reaction, and dissolved oxygen plays a weak role in the degradation of HA.
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[This work was financially supported by the National Natural Science Foundation of China (No. 20876104, 21176168) and the Science and Technology Foundation of Shanxi Province, China (No. 20090311082).]
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Yuan, Ph., Fan, Cm., Ding, Gy. et al. Preparation and photocatalytic properties of ilmenite NiTiO3 powders for degradation of humic acid in water. Int J Miner Metall Mater 19, 372–376 (2012). https://doi.org/10.1007/s12613-012-0566-6
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DOI: https://doi.org/10.1007/s12613-012-0566-6