中华医学超声杂志

应用化学 ›› 1993, Vol. 0 ›› Issue (1): 66-70.

• 研究论文 • 上一篇    下一篇

聚乙烯醇-Cr3+树胶状物的形成

程传煊1, 苏英草2   

  1. 1. 福建师范大学化学系 350007 福州;
    2. 福建师范大学高分子研究所 福州
  • 收稿日期:1992-03-03 修回日期:1992-07-02 出版日期:1993-02-10 发布日期:1993-02-10

FORMATION OF RESINOUS SUBSTANCE FROM POLYVINYL ALCOHOL AND Cr(Ⅲ)

Cheng Chuanxuan1, Su Yingeao2   

  1. 1. Department of Chemistry, Fujian Normal University, 350007 Fuzhou;
    2. Institude of Polymer Science, Fujian University, Fuzhou
  • Received:1992-03-03 Revised:1992-07-02 Published:1993-02-10 Online:1993-02-10

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摘要： 在12≤pH≤13的5%PVA中添加0.2g CrCl3·6H2O有灰蓝色树胶状物析出。XPS、ESR、IR和电泳等研究表明,PVA的部分羟基发生脱质子反应而提供配位基L-该配位基能与Cr(Ⅲ)盐和NaOH生成的初生Cr(OH)3·nH2O的Cr3+形成配位键,从而发生配位体与Cr3+间的交联反应,生成Cr(Ⅲ)-PVA配位聚合物。该析出物具有顺磁性,溶于盐酸,从而可用以富集和回收Cr(Ⅲ)。

关键词: 聚乙烯醇, 铬离子(Ⅲ), 配位聚合物

Abstract: A greyish blue resinous substance was separated by adding Cr3+ to a basic aqueous solution of 5% PVA at 12≤pH≤13. The formation of the resinous substance has been studied by XPS,ESR, IR and electrophoretie techniques. It is considered that at the experimental conditions deprotonation of some hydroxyl groups in the PVA may afford a ligand L- which may form coordinate with Cr3+ through partial ionic bond. Thus,it results in a cross-linking between Cr3+ and deprotonated hydroxyl groups of PVA. The product is paramagnetic. This phenomena may be applied to treating Cr3+ containing waste for chromium recovery by dissolving the complex in hydrochloric acid.

Key words: polyvinyl alcohol, chromium ion, coordination polymer

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