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

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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Abstract

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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铁镁粘土-石英床动态吸附Pb的微柱试验

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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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.