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pari515

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通常吸附剂表面存在着两类不同吸附点位,即高结合能点位和低结合能点位。当初始浓度较低时,Cr(VI)和Ni(II)首先被吸附至高结合能点位上,由于其吸附密度低,离子间的斥力较小,因此浓度的变化对去除率的影响不明显。随着初始浓度的增加,高结合能的点位逐渐饱和,更多的低结合能的点位开始吸附Cr(VI)和Ni(II),且吸附密度变大,离子间的斥力增加,导致了去除率的明显下降。
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爱与雨下: 金币+1 2012-10-23 20:57:22
pari515: 金币+10, 翻译EPI+1, ★★★很有帮助 2012-10-25 09:36:52
Usually absorbents have two different absorption points on surface, the high binding energy point and low binding energy point. When the initial concentration is low, Cr(VI) and Ni(II) firstly attach to high binding energy point. Due to the low absorption density, repulsion between ions are relatively low so the change of concentration has least effects on removal percentages. With initial concentration increased, high binding energy point gets saturated and more low ones start to absorb Cr(VI) and Ni(II) while low points absorption density gets larger and ions repulsion increases, which leads to dramatic decrease in removal percentage.
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