Structure of aqueous sodium sulfate solutions derived from X-raydiffraction

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	Structure of aqueous sodium sulfate solutions derived from X-raydiffraction
	Xu JiXiang; Fang Yan; Fang ChunHui
	2009
发表期刊	CHINESE SCIENCE BULLETIN
ISSN	1001-6538
卷号	54 期号:12 页码:2022-2027
关键词	Solution Structure Sodium Sulfate Radial Distribution Function
语种	A rapid liquid X-ray diffractometer was used to study the time-averaged and space-averaged structure of aqueous sodium sulfate solutions at 298 and 323 K. Difference radial distribution functions of the solutions were obtained from accurate diffraction data. The interaction distances of Na(+)-OH(2) and S-H(2)O in solutions were found to be 0.235 and 0.385 nm, respectively, after deconvolution of superposition peaks by Gaussian multi-peak fitting program. The characteristic distance of the NaSO (4) (-) contact ion pairs in higher concentration solutions was determined to be 0.345 nm, suggesting that the Na(+) ions coordinated with SO (4) (2-) ions in the mono-dentate form. Effects of concentration and temperature on the hydration structure of the solutions were discussed in the present paper. With a decrease in concentration, the contributions of the H(2)O to the diffraction pattern increase, the average coordination number of the Na(+) ions hardly changes, while the hydration number of SO (4) (2-) ions increases slightly. The formation of NaSO (4) (-) contact ion pairs becomes easier at higher temperature. The structure of hydrogen bond in dilute solutions is broken to a considerable extent with rising temperature, and the peak at 0.290 nm splits into two peaks at 0.275 and 0.305 nm, respectively. A rapid liquid X-ray diffractometer was used to study the time-averaged and space-averaged structure of aqueous sodium sulfate solutions at 298 and 323 K. Difference radial distribution functions of the solutions were obtained from accurate diffraction data. The interaction distances of Na(+)-OH(2) and S-H(2)O in solutions were found to be 0.235 and 0.385 nm, respectively, after deconvolution of superposition peaks by Gaussian multi-peak fitting program. The characteristic distance of the NaSO (4) (-) contact ion pairs in higher concentration solutions was determined to be 0.345 nm, suggesting that the Na(+) ions coordinated with SO (4) (2-) ions in the mono-dentate form. Effects of concentration and temperature on the hydration structure of the solutions were discussed in the present paper. With a decrease in concentration, the contributions of the H(2)O to the diffraction pattern increase, the average coordination number of the Na(+) ions hardly changes, while the hydration number of SO (4) (2-) ions increases slightly. The formation of NaSO (4) (-) contact ion pairs becomes easier at higher temperature. The structure of hydrogen bond in dilute solutions is broken to a considerable extent with rising temperature, and the peak at 0.290 nm splits into two peaks at 0.275 and 0.305 nm, respectively.
文献类型	期刊论文
条目标识符	http://ir.isl.ac.cn/handle/363002/2106
专题	青海盐湖研究所知识仓储
推荐引用方式 GB/T 7714	Xu JiXiang,Fang Yan,Fang ChunHui. Structure of aqueous sodium sulfate solutions derived from X-raydiffraction[J]. CHINESE SCIENCE BULLETIN,2009,54(12):2022-2027.
APA	Xu JiXiang,Fang Yan,&Fang ChunHui.(2009).Structure of aqueous sodium sulfate solutions derived from X-raydiffraction.CHINESE SCIENCE BULLETIN,54(12),2022-2027.
MLA	Xu JiXiang,et al."Structure of aqueous sodium sulfate solutions derived from X-raydiffraction".CHINESE SCIENCE BULLETIN 54.12(2009):2022-2027.