铁镁粘土-石英床动态吸附Pb的微柱试验

IF 1.1 4区地球科学 Q4 CHEMISTRY, PHYSICAL

Clay Minerals Pub Date : 2022-09-01 DOI:10.1180/clm.2022.45

Zacharenia Kypritidou, M. Gatou, A. Argyraki, Vasilios Zotiadis

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引用次数: 0

摘要

摘要粘土已被广泛用作潜在有毒元素的吸附剂，尤其是铅。然而，它们的吸附效率大多是在劳动密集型的静态实验条件下研究的。在本研究中，使用微柱建立了动态吸附实验，通过改变入口溶液pH、Pb浓度和流速来评估天然富铁镁粘土对Pb离子的吸附行为。粘土由不同数量的坡缕石和铁蒙脱石组成，用石英（Qz）砂稀释以提高其渗透性。观察到富含凹凸棒石/铁-蒙脱石的混合粘土床具有更大的吸附能力（45.2±0.01 mg g–1），其次是富含铁-蒙脱石（35.7±0.07 mg g–2）和富含凹凸棒岩（20.0±0.03 mg g g–1。结果表明，坡缕石/富铁蒙脱石粘土具有较高的吸附效率，这可能归因于坡缕石和富铁蒙脱石-粘土相共存的协同效应，它们具有明显的物理化学特征。此外，所获得的结果与静态实验显示出良好的一致性，这意味着使用微柱可以在更短的实验时间内充分描述吸附。

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Micro-column testing of the dynamic adsorption of Pb by Fe-Mg clay–quartz beds

Abstract Clays have been used widely as sorbents of potentially toxic elements, especially Pb. However, their adsorption efficiency has been studied mostly under static experimental conditions, which are labour-intensive. In this study, dynamic adsorption experiments were established using micro-columns to assess the adsorption behaviour of natural Fe-Mg-rich clays for Pb ions by varying the inlet solution pH, Pb concentration and flow rate. The clays, consisting of varying amounts of palygorskite and Fe-smectite, were diluted with quartz (Qz) sand to enhance their permeability. Greater adsorption capacity was observed for the mixed palygorskite/Fe-smectite-rich clay beds (45.2 ± 0.01 mg g–1) followed by the Fe-smectite-rich (35.7 ± 0.07 mg g–1) and palygorskite-rich (20.0 ± 0.03 mg g–1) clay beds. The results indicated that the greater adsorption efficiency of palygorskite/Fe-smectite-rich clays could be attributed to synergistic effects due to the coexistence of palygorskite and Fe-smectite clay phases, which have distinct physicochemical characteristics. Moreover, the results obtained showed good agreement with the static experiments, implying that the use of micro-columns could describe adsorption adequately over shorter experimental times.

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来源期刊

Clay Minerals 地学-矿物学

CiteScore

3.00

自引率

20.00%

发文量

审稿时长

6 months

期刊介绍： Clay Minerals is an international journal of mineral sciences, published four times a year, including research papers about clays, clay minerals and related materials, natural or synthetic. The journal includes papers on Earth processes soil science, geology/mineralogy, chemistry/material science, colloid/surface science, applied science and technology and health/ environment topics. The journal has an international editorial board with members from fifteen countries.