ELECTROSYNTHESIS OF SODIUM PERBORATE USING AIR CATHODE

Pan Zhanchang; Pen Yongyuan(Department of Chemical Engineering

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ELECTROSYNTHESIS OF SODIUM PERBORATE USING AIR CATHODE

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- ELECTROSYNTHESIS OF SODIUM PERBORATE USING AIR CATHODE
- CIESC Journal Issue 6, (1996)
- 作者机构：
  
  广东工业大学化工系!广州510090,华南师范大学化学系,广州,510631
- 作者简介：
- 基金信息：
- DOI：
  CLC： 646
- Online First：25 December 1996，
  
  Published：25 December 1996
- 稿件说明：
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Pan Zhanchang, Pen Yongyuan(Department of Chemical Engineering. ELECTROSYNTHESIS OF SODIUM PERBORATE USING AIR CATHODE[J]. CIESC Journal, 1996, (6).
DOI：

Pan Zhanchang, Pen Yongyuan(Department of Chemical Engineering. ELECTROSYNTHESIS OF SODIUM PERBORATE USING AIR CATHODE[J]. CIESC Journal, 1996, (6). DOI：

摘要

用空气阴极代替锡阴极在Na_2CO_3-Na_2B_4O_7介质中电解合成过硼酸钠.电解结果表明，在阴极电流密度为30～50mA·cm~(-2)时，阴极电流效率为65％～54％．X射线衍射表明结晶产物为NaBO_2·H_2O_2·3H_2O.恒电流计时电位法测定Na_2B_4O_7-H_2O_2和Na_2CO_3-H_2O_2体系电位与时间关系.从iτ~(1/2)～i关系求得过氧化氢与硼酸离子的络合速度常数为7.21×10~3L·s~(-1)·mol~(-1)，过硼酸离子的离解速度常数为2.14×10~2s~(-1).Na_2CO_3-H_2O_2体系的ιτ~(1/2)与i无关，表明过碳酸离子离解速度很大.

Abstract

Air cathode instead of tin cathode is used to synthesize electrochemically sodium perborate in Na_2CO_3-Na_2B_4O_7 medium.The electrolysis result indicates that the cathode current efficiency is 65%～54%

the corresponding cathode current density being 30～50mA·cm~(-2).X-ray diffraction indicates that the crystal product is NaBO_2·H_2O_2·3H_2O.Constant current chronopo-tentiometry is used to determine the relation between time and potential in Na_2B_4O_7-H_2O_2 medium and in Na_2CO_3-H_2O_2 medium.The rate constant for the complexation of hydrogen peroxide and borate ion and the dissociation rate constant of perborate ion are 7.21×10~3 L·s-l·mol~(-1)and 2.14×10~2s~(-l)respectively

which are calculated from the relati on between iτ~(1/2)and i in Na_2B_4O_7-H_2O_2 medium.The iτ~(1/2)is independent of i in Na_2CO_3-H_2O_2 medium

which indicates that the dissociation rate of percarbonate ion is very fast.

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