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过硫酸钠

Sodium persulfate
别名 Sodium peroxodisulfate
Sodium peroxodisulphate
Sodium peroxydisulfate
Sodium peroxydisulphate
识别
CAS号 7775-27-1  checkY
PubChem 62655
ChemSpider 56406
SMILES
 
  • [Na+].[Na+].O=S(=O)([O-])OOS([O-])(=O)=O
InChI
 
  • 1/2Na.H2O8S2/c;;1-9(2,3)7-8-10(4,5)6/h;;(H,1,2,3)(H,4,5,6)/q2*+1;/p-2
InChIKey CHQMHPLRPQMAMX-NUQVWONBAA
UN编号 1505
EINECS 231-892-1
RTECS SE0525000
性质
化学式 Na2S2O8
摩尔质量 238.10 g/mol g·mol⁻¹
外观 白色粉末
密度 2.59 g/cm3
(Loose bulk density: 1.12 g/cm3)[1]
熔点 180 °C(453 K)(分解)
溶解性 55.6 g/100 ml (20 °C)
危险性
警示术语 R:R8 R20 R22 R36 R37 R38
安全术语 S:S17 S26 S36
NFPA 704
0
2
1
 
闪点 不可燃
相关物质
其他阴离子 连二亚硫酸钠
亚硫酸钠
硫酸钠
其他阳离子 过硫酸钾
若非注明,所有数据均出自标准状态(25 ℃,100 kPa)下。

过硫酸钠是一种无机化合物,化学式为Na2S2O8。它是过二硫酸的钠盐,是一种强氧化剂。它几乎不潮解,可以长时间储存。

制备

过硫酸钠可以通过硫酸氢钠的电解氧化制得:

2 NaHSO4 → Na2S2O8 + H2

氧化在铂阳极发生。[2]2005年,大约有165,000吨的过硫酸钠被这样制成。[3]

过硫酸钠的标准氧化还原电位为2.1 V,高于过氧化氢(1.8 V),低于臭氧(2.2 V)。[4]原位生成的硫酸根自由基(sulfate radical)的标准电极电势为2.7 V。

参考文献

  1. ^ FMC Corporation. Sodium Persulfate. 存档副本 (PDF). [2013-11-17]. (原始内容 (PDF)存档于2011-11-21).  (accessed Nov 17, 2013).
  2. ^ Pietzsch, A.; Adolph, G. J. Chem. Technol. Biotechnol. 1911, 30, 85.
  3. ^ Harald Jakob, Stefan Leininger, Thomas Lehmann, Sylvia Jacobi, Sven Gutewort, Peroxo Compounds, Inorganic, Ullmann's Encyclopedia of Industrial Chemistry, Weinheim: Wiley-VCH, 2005, doi:10.1002/14356007.a19_177.pub2 
  4. ^ Block, Philip A., Richard A. Brown, and David Robinson. "Novel activation technologies for sodium persulfate in situ chemical oxidation." Proceedings of the Fourth International Conference on the remediation of chlorinated and recalcitrant compounds. 2004.

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过硫酸钠
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