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首页> 外文期刊>Separation and Purification Technology >Sorption behavior of Cu(II) ions on insolubilized humic acid under acidic conditions: An application of Scatchard plot analysis in evaluating the pH dependence of specific and nonspecific bindings
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Sorption behavior of Cu(II) ions on insolubilized humic acid under acidic conditions: An application of Scatchard plot analysis in evaluating the pH dependence of specific and nonspecific bindings

机译：酸性条件下Cu（II）离子在不溶性腐殖酸上的吸附行为：Scatchard图分析在评估特定和非特异性结合的pH依赖性中的应用

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Sorption behavior of Cu(II) ions on a humic acid-based solid phase,insolubilized humic acid (IHA),were investigated under continuous column conditions.The quantitative data were derived on the basis of breakthrough curves obtained at different experimental conditions.For the studied experimental conditions,the highest and lowest observable capacities of IHA toward Cu(II) were found as 48.34 and 0.84 mu mol g_1,respectively.In order to evaluate the pH dependence of Cu(II) binding on IHA,the effect of influent concentration was investigated at three different pH values (1.0,2.0 and 3.0),and adsorption isotherms were derived for each acidic condition.The characteristics of Cu(II) bindings were evaluated by using Scatchard plot analysis,and it was observed that under strongly acidic condition,pH 1.0,nonspecific and/or multi-type interactions between Cu(II) and IHA were the prevailing effects causing the Cu(II) sorption.On the other hand,at pH 2.0 and 3.0,the role of specific interactions was more clearly observed,and so at pH(s) 2.0 and 3.0,the binding of Cu(II) on IHA was mainly attributed to specific interactions rather than nonspecific ones.For pH 2.0 and 3.0,the binding types of Cu(II) on IHA were sub-classified according to different affinities observed between Cu(II) and IHA,and thus two main types of specific bindings were proposed for the studied influent concentration range (1.0 x 10~(-3) to 1.0 x 10~(1) mol l-1): Type-1,high-affinity/low capacity and Type-2,low-affinity/high capacity bindings.Finally,probable benefit of each specific binding type in separation of Cu(II) from acidic aqueous media has been discussed in detail.
机译：在连续柱条件下研究了Cu（II）离子在腐​​殖酸基固相，不溶性腐殖酸（IHA）上的吸附行为。基于在不同实验条件下获得的穿透曲线得出了定量数据。在实验条件下，IHA对Cu（II）的最高和最低可观察到的容量分别为48.34和0.84μmolmol g_1。为了评估Cu（II）结合对IHA的pH依赖性，进水浓度的影响在三个不同的pH值（1.0、2.0和3.0）下进行了研究，得出了每种酸性条件下的吸附等温线。使用Scatchard图分析评估了Cu（II）的结合特性，并观察到在强酸性条件下，pH 1.0，Cu（II）与IHA之间的非特异性和/或多型相互作用是导致Cu（II）吸附的主要因素。另一方面，在pH 2.0和3.0下，特异性相互作用的作用如更清楚地观察到的，因此在pH值为2.0和3.0时，Cu（II）在IHA上的结合主要归因于特异性相互作用，而不是非特异性相互作用。对于pH 2.0和3.0，Cu（II）的结合类型根据观察到的Cu（II）和IHA之间的亲和力，将IHA上的亚类进行了亚分类，因此针对所研究的进水浓度范围，提出了两种主要类型的特异性结合（1.0 x 10〜（-3）至1.0 x 10〜（ 1）mol l-1）：1型，高亲和力/低容量和2型，低亲和力/高容量结合。最后，每种特定结合类型在酸性水溶液中分离Cu（II）的可能益处媒体已被详细讨论。

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