Interaction of Clay Materials With Lead in Aqueous Solutions

Kypritidou, Zacharenia; Argyraki, Ariadne; Chryssikos, Georgios D.; Stamatakis, Michail

doi:10.12681/bgsg.14278

Cited by 6 publications

(6 citation statements)

References 11 publications

(15 reference statements)

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“…The measurement considers the elements as fully oxidized (Konopka 2013) and for this reason the chloride is not included. The major elements of the tested sample, Mg, Al, Si, Fe and Ca were determined and agreed with the available literature for the palygorskite deposit of Western Macedonia (Kypritidou et al 2016). The lack of sodium in this deposit was reported by Kypritidou et al 2016, while after the sodium-treatment procedure of the present study, Na reached a value of 4.386 + 0.408%.…”

Section: Resultssupporting

confidence: 82%

Ca2+ removal from water by the use of Na-palygorskite for potential water softening

et al. 2021

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Sodium-treated palygorskite (Na-Pal) sample was investigated for the sorption of Ca2+ ions with the aim of treating water hardness. The effective modification of the mineral with Na+ was verified by XRD and FT-IR techniques. Batch kinetic experiments in standard solutions were performed proving that 30 g/L of Na-Pal were highly satisfactory as the Ca2+ removal reached the 85% for 100 mg/L Ca2+ initial concentration, which is very promising for the softening of moderate or hard waters. The Ca2+ removal found to be pH and temperature independent, with high removal rates at room temperature and common pH values of water samples (pH 4–12), rendering these circumstances ideal for the low-cost maintenance of the procedure that took place within the first 5 min. The linear form of Langmuir isotherm model expressed better (R2 = 1) the Ca2+ sorption, which means that takes place at specific homogeneous sites of Na-Pal. Thermodynamic analysis proved the non-spontaneous (positive ΔG0), physical, and exothermic nature (ΔH0 = −10.8197 kJ/mol) of the reaction, while the kinetic models proved the chemisorption of Ca2+ by Na-Pal.

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Section: Resultssupporting

confidence: 82%

Ca2+ removal from water by the use of Na-palygorskite for potential water softening

et al. 2021

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“…The experimental conditions for the sorption experiments were selected according to previous equilibrium studies (Kypritidou et al , 2016) to optimize the results obtained. Specifically, the best reproducibility in the results has been observed for a solid/liquid ratio of 10 g L –1 , a pH of 3.6 of the initial solution has been selected to ensure metal mobility and a contact time of 4 h to ascertain equilibrium.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…The mineralogical characterization of the clay materials studied was based on a combination of powder X-ray diffraction (PXRD) and Fourier transform infrared spectroscopy (FTIR) data. Details were presented in a previous study (Kypritidou et al , 2016). Τhe respective XRD diagrams and FTIR spectra (with explanations), the micro-morphological characteristics observed with scanning electron microscopy and the bulk chemistry of the samples are provided in the Supplementary Material ().…”

Section: Methodsmentioning

confidence: 99%

“…The present work is a follow-up of preliminary sorption results (Kypritidou et al, 2016) and focuses on the interaction processes between the clays and metal ions in monometallic, concentrated solutions of Pb and Cu. This approach has been adopted to simplify the system by controlling the number of dissolved species and gain a better insight into the metalretention mechanisms involved.…”

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confidence: 99%

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A multi-site mechanism model for studying Pb and Cu retention from aqueous solutions by Fe-Mg-rich clays

Kypritidou

Argyraki

2018

Clay miner.

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The retention mechanisms of metal ions during interaction of clay with metal-rich aqueous solutions is usually investigated by sorption isotherms. Although classical isotherm models may provide sufficient information about the characteristics of the solid–liquid system, they do not distinguish among the various retention mechanisms. This study presents a methodological approach of combining batch experiment data and geochemical modelling for the characterization of the interaction of Mg-Fe-rich clay materials with monometallic solutions of Pb and Cu. For this purpose, a palygorskite clay (PCM), an Fe-smectite clay (SCM) and a natural palygorskite-Fe-smectite mixed clay (MCM) were assessed for their effectiveness as metal ion sorbents. The sorption capacity of the materials follows the order MCM > SCM > PCM and ranges between 27.6–52.1 mg g–1 for Pb and 7.7–17.6 mg g–1 for Cu. Based on the experimental results that allowed the speciation calculations, fitting of sorption isotherms and the investigation of relationships between protons, Mg and the metals studied we suggest that a combination of sorption mechanisms occurs during the interaction of clay materials with metal solutions. These involve surface complexation, ion exchange and precipitation of solid compounds onto the solid surface. A three-term isotherm model was employed to quantify the role of each of the above mechanisms in the overall retention process. The superior performance of mixed clay among the materials tested is attributed to the synergetic effect of exchange in the interlayer and specific sorption on the clay edges.

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“…The adsorption efficiency of clays regarding Pb has been extensively studied in the laboratory using single-and/or multi-element solutions under static (batch) experimental conditions. Static (batch) experiments are used to study adsorption kinetics and retention mechanisms by altering different variables of the solution, such as pH, temperature, ionic strength and sorbate concentration (Bourliva et al, 2013;Guerra et al, 2013;Mhamdi et al, 2013;Kypritidou et al, 2016). In these experiments, solutions of fixed concentrations are mixed with a predefined quantity of solids, for a constant period of time.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2022

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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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Interaction of Clay Materials With Lead in Aqueous Solutions

Abstract: Five bulk clay samples were characterized by XRD, XRF, FTIR and SEM and

Cited by 6 publications

References 11 publications

Ca2+ removal from water by the use of Na-palygorskite for potential water softening

Ca2+ removal from water by the use of Na-palygorskite for potential water softening

A multi-site mechanism model for studying Pb and Cu retention from aqueous solutions by Fe-Mg-rich clays

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

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