Chemical Entrapment of Divalent Lead By Ettringite

2009 3rd International Conference on Bioinformatics and Biomedical Engineering Pub Date : 2009-06-11 DOI:10.1109/ICBBE.2009.5162499

Jun-kang Lan, K. Ding, Meng Wu, Baojian Liu

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引用次数: 1

Abstract

This work aims to make clear whether Pb(II) can be chemically entrapped by ettringite and find out under what conditions this entrapment can take place. In experiment condition, several chemical analytical reagents were used to synthesize the lead analog of ettringite {Pb6[Al(OH)6]2ldr3SO4ldr26H2O}, Ca-Pb ettringite {(Ca,Pb)6 [Al(OH)6]2ldr3SO4ldr26H2O} and plumbite ettringite {3CaOldr Al2O3ldr3CaPbO2ldr31H2O}. The results showed that the lead analog of ettringite and the plumibte ettringite couldn't be synthesized, while Ca-Pb ettringite could be made. This indicated that Pb(II) couldn't be chemically entrapped by ettringite when divalent calcium or sulfate was absent in liquid phase. However, Pb(II) could entrapped into ettringite lattice when calcium ions existed in liquid phase to formed Ca-Pb ettringite. The X-ray diffraction patterns of Ca-Pb ettringite were significantly different from that of Ca-ettringite, indicating that ettringite' lattice been varied after accommodating divalent lead. Experiments on Pb(II) solidified by 100% type I clinker showed that the XRD patterns of the paste at 7-day storage period changed after they doped divalent lead, These further confirmed that Pb(II) could be entrapped into cement minerals including ettringite.

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钙矾石对二价铅的化学捕集

这项工作的目的是弄清楚铅(II)是否可以被钙矾石化学包裹，并找出在什么条件下可以发生这种包裹。在实验条件下，利用几种化学分析试剂合成了钙矾石{Pb6[Al(OH)6]2ldr3SO4ldr26H2O}、钙铅钙矾石{(Ca,Pb)6 [Al(OH)6]2ldr3SO4ldr26H2O}和铅铅矿钙矾石{3CaOldr Al2O3ldr3CaPbO2ldr31H2O}的铅模拟物。结果表明，铅钙矾石和铅铅钙矾石的类似物无法合成，而钙铅钙矾石是可以制备的。说明在液相中不存在二价钙或硫酸盐时，钙矾石不能对Pb(II)进行化学包埋。而当钙离子存在于液相中时，Pb(II)会被困在钙矾石晶格中形成钙-Pb钙矾石。钙铅钙矾石的x射线衍射图与钙钙矾石的x射线衍射图有显著差异，说明钙钙矾石的晶格在加入二价铅后发生了变化。对100% I型熟料固化Pb(II)的实验表明，掺入二价铅后，膏体在贮存7 d后的XRD谱图发生了变化，这进一步证实了Pb(II)可以被钙矾石等水泥矿物包裹。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2009 3rd International Conference on Bioinformatics and Biomedical Engineering

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