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盐酸脱附Pb(Ⅱ)负载氨基膦酸树脂的基本性能

Keywords: 氨基膦酸树脂,Pb(Ⅱ),脱附,盐酸,二氯化铅,溶解度

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Abstract:

氨基膦酸树脂是一种常用的广谱性重金属螯合树脂,对水中的Pb(Ⅱ)具有很好的选择性分离去除能力,但吸附Pb(Ⅱ)后的树脂再生较为困难。系统研究了盐酸脱附Pb(Ⅱ)-负载氨基膦酸树脂D860的基本性能,优化了基本脱附参数。实验表明,采用盐酸作为脱附剂具有较为良好的脱附效果,10%吸附量树脂脱附反应平衡较快仅需10min,脱附本身受Pb(Ⅱ)在盐酸溶液中的溶解度影响显著。脱附流速从1BV/h升高到5BV/h,脱附效果受到的影响很小。升高温度可以提高PbCl2溶解度,进而提高脱附效率。固定床脱附采用1.0mol/L盐酸,在1BV/h和303K条件下,仅需7BV脱附剂即可实现较高的脱附效率。

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