Adsorption of Humic Acid to Mineral Particles. 1. Specific and Electrostatic Interactions
Adsorption of Humic Acid to Mineral Particles. 1. Specific and Electrostatic Interactions
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DOI：
10.1021/la970624r
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发表时间：
1998-04
期刊：
影响因子：
3.9
通讯作者：
A. Vermeer;W. H. Riemsdijk;L. Koopal
中科院分区：
文献类型：
--
作者：
A. Vermeer;W. H. Riemsdijk;L. Koopal
腐殖酸对矿物颗粒的吸附可以通过特定的静电相互作用和多分散性效应来表征。在本文中，我们专注于吸附量，并讨论特定的和静电相互作用的重要性。纯化奥德里奇腐殖酸到赤铁矿的吸附已被测量为pH值和盐浓度的函数，以及在两个镉浓度的存在下。除了吸附量，吸附层的厚度也进行了研究。并对实验结果进行了讨论。在高pH和低盐浓度下，吸附低，并且腐殖酸分子相对平坦地吸附在表面上。在低pH和高盐浓度下，吸附的腐殖酸的相当大的部分不与表面直接接触，这导致相对高的吸附量和大的层厚度。PAHA在不太低的pH值下的吸附导致了一个很好的结果。
The adsorption of humic acid to mineral particles can be characterized by specific and electrostatic interactions and by polydispersity effects. In this paper we focus on the adsorbed amount and discuss the importance of specific and electrostatic interactions. The adsorption of purified Aldrich humic acid onto hematite has been measured as a function of pH and salt concentration as well as in the presence of two cadmium concentrations. Besides the adsorbed amount, the thickness of the adsorbed layer has also been studied. The experimental results are discussed in relation to the polyelectrolyte behavior of the humic acid. At high pH and low salt concentration the adsorption is low and the humic acid molecules are adsorbed relatively flat on the surface. At low pH and high salt concentration a substantial fraction of the adsorbed humic acid is not in direct contact with the surface, which results in a relatively high adsorbed amount and a large layer thickness. PAHA adsorption at not too low pH leads to a...