The role of humic substances in chromium sorption onto natural organic matter (peat)
The role of humic substances in chromium sorption onto natural organic matter (peat)
复制标题
DOI：
10.1016/j.chemosphere.2005.09.042
复制
发表时间：
2006-06-01
期刊：
影响因子：
8.8
通讯作者：
Schmitt-Kopplin, Ph.
中科院分区：
文献类型：
--
作者：
Kyziol, J.;Twardowska, I.;Schmitt-Kopplin, Ph.
为了阐明Cr3+吸附在未改变的固体天然有机物上的机理，我们从泥炭（灌木泥炭腐殖质）样品中通过湿筛分离，在pH为4.0的溶液中选择了3种不同HS含量和结构的粒径组分：2000-1000 μ m、630-200 μ m和63-20 μ m，对比研究了Cr3+吸附在未改变的天然有机物上的机理。COOH基团和CECt的比较模式证实了阳离子交换能力主要由与COO官能团相连的阳离子负责。虽然发现固态的脂肪酸不参与Cr3+的结合，因此研究的最细的官能团含量最高的63-20 μ m的组分对Cr3+的吸附能力最低，而吸附的Cr3+、可溶性HS含量和碱CEC0的相似模式表明这些参数直接相关。由CEC0决定的碱离子交换过程（以Ca2+为主要交换阳离子）似乎不是负责Cr3+吸附的主要机制。对于这种金属，与不溶性大分子量有机池的强结合比离子交换过程强2 ~ 3倍。非常低的酸解吸表明Cr3+有机化合物的流动性普遍较低。(c) 2005 Elsevier Ltd版权所有。
To elucidate mechanisms of Cr3+ sorption onto the unaltered solid natural organic matter, the comparative studies of this ion binding from a solution at pH 4.0 onto three selected particle size fractions: 2000-1000 mu m, 630-200 mu m and 63-20 mu m of markedly different HS content and structure, separated by a wet sieving from an overall sample of peat (Brushwood Peat Humus) were carried out. Comparable patterns of COOH groups and CECt confirmed that for cation exchange capacity were responsible mainly cations connected with COO- functional groups. It was though found that aliphatic acids in the solid state did not take part in Cr3+ binding, thus the finest studied fraction 63-20 mu m of the highest contents of functional groups showed the lowest sorption capacity for Cr3+, while similar patterns of sorbed Cr3+, soluble HS content and base CEC0 indicated that these parameters were directly interrelated. The base ion exchange processes determined by CEC0 (with Ca2+ as a predominant exchangeable cation) appeared to be not the major mechanisms responsible for Cr3+ sorption. For this metal, strong binding to insoluble large molecular weight organic pool two- to threefold prevailed over the ion exchange processes. Very low acid desorption indicated generally low mobility of Cr3+-organic compounds. (c) 2005 Elsevier Ltd. All rights reserved.