THE REMOVAL OF MERCURY(II) FROM DILUTE AQUEOUS-SOLUTION BY ACTIVATED CARBON
THE REMOVAL OF MERCURY(II) FROM DILUTE AQUEOUS-SOLUTION BY ACTIVATED CARBON
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DOI：
10.1016/0043-1354(84)90045-9
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发表时间：
1984-01-01
期刊：
影响因子：
12.8
通讯作者：
BLANKENSHIP, DW
中科院分区：
文献类型：
--
作者：
HUANG, CP;BLANKENSHIP, DW
初步筛选比较了11种不同牌号商品活性碳对汞(II)的总去除能力，结果表明，所有类型的活性碳对汞的总脱除率都很高(99-100%)，特别是在pH值为4-5时；总汞(II)的脱除率随着pH值的升高而降低。4-5除活性碳Nuchar SA和SN外，它们在所有pH值下都保持了较高的总汞(II)去除能力百分比(>；90%)。通过实验研究了Nuchar SA(粉状碳)对汞的去除机理。总汞(II)的去除通过吸附和还原两种机制实现。为了研究这两个反应的动力学，采用大流量氮气鼓泡挥发的方法去除还原反应生成的汞(G)。吸附和还原/挥发反应高度依赖于pH；<；3-4或>；.apprx。9-10还原/挥发反应取代吸附反应，在中等pH区，吸附反应主导总汞(II)的去除。吸附反应速度快，在几分钟内达到平衡；还原/挥发速率符合线性平方根。T[时间]表达式。Filtrasorb400(H型碳)的还原反应比Nuchar SA(L型碳)更显著。在强络合剂EDTA存在下，汞(II)的总去除量下降，部分原因是形成了较难吸附的汞(II)-EDTA络合物。
The results of preliminary screening tests comparing the total Hg(II) removal capacity of 11 different brands of commercial activated carbon indicated that a high percent (99-100%) total Hg removal was attained by all types of activated carbon especially at pH 4-5; the percent total Hg(II) removal decreased with pH .**GRAPHIC**. 4-5 except activated carbons Nuchar SA and SN which maintained a relatively high percent (> 90%) total Hg(II) removal capacity at all pH values. Experiments were conducted to reveal the mechanisms of Hg(II) removal by Nuchar SA (a powdered carbon). Total Hg(II) removal was achieved by 2 mechanisms, adsorption and reduction. In order to investigate the kinetics of these 2 reactions, volatilization by bubbling N2 gas at high flow rate was used to remove the Hg(g) product of the reduction reaction. The adsorption and reduction/volatilization reactions were highly pH-dependent; at pH .apprx. < 3-4 or > .apprx. 9-10 the extent of reduction/volatilization reaction superceded the adsorption reaction; in the mid-pH region adsorption reaction dominated total Hg(II) removal. The rate of adsorption reaction was fast, reaching equilibrium in a few minutes; the rate of reduction/volatilization followed a linear .sqroot. t [time] expression. The reduction reaction was more significant with Filtrasorb 400 (H-type carbon) than Nuchar SA (L-type carbon). In the presence of strong chelating agent, EDTA, the total Hg(II) removal decreased due partly to the formation of less adsorbably Hg(II)-EDTA complexes.