Journal of Liaoning Petrochemical University
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The Effect of Initial Concentration and pH Value of the Uranyl Nitrate Solution on the Its Hydrolysis Reaction
Wu Xiaomeng, Liu Hongxue, Wang Rui, Jiang Heng
Abstract776)      PDF (2419KB)(742)      
The effect of initial concentration and pH value of the uranyl nitrate solution on the uranyl ion (UO2+2) hydrolysis reaction was studied by spectrophotometry. The maximum absorption wavelength of the obtained complexes in the reaction of UO2+2 ions with arsenazo (Ⅲ) at different pH values was also investigated. The results show that the absorption wavelength is 652 nm in the range of pH 3.0~7.0. It is easier for the uranyl nitrate solution to hydrolysis at higher pH value than the lower in the range of pH 4.0~6.0 at the same UO2+2 concentration. The uranyl solution at high concentration is prior to occurring hydrolysis reaction in the same pH value. Lowest pH values of various uranyl solutions were obtained for hydrolysis reaction. The results indicate that the concentration of uranyl solution should not exceed 1.000×10-3 mol/L at pH 5.0.
2015, 35 (5): 18-21. DOI: 10.3969/j.issn.1672-6952.2015.05.005
LowTemperature Synthesis of Potassium Niobate by Improved SolidState Method and Its Photocatalytic Properties
Su Tingting, You Chunling, Zang Litao, Fan Chunyu, Jiang Heng, Gong Hong
Abstract525)      PDF (2318KB)(481)      
Potassium Niobate was obtained by grinding the mixture of niobium formate and potassium hydroxide and small amount of water, then dried at room temperature, and finally calcined at 500 ℃ for 3 h . It can be seen from the Infrared spectroscopy that an ionexchange reaction occurred and NH3 was released during grinding. Assynthesized potassium niobate powders were used to degrade methylene blue solution under irradiation of UV, and found that the catalyst showed better photocatalytic properties, and the degradation ratio reaches to 90% after 3 h reaction.
2014, 34 (4): 18-21. DOI: 10.3696/j.issn.1672-6952.2014.04.005