Investigation of adsorption mechanism of phosphate(V) ions on the nanostructured Na-A zeolite surface modified with ionic polyacrylamide with regard to their removal from aqueous solution

Wiśniewska, Małgorzata; Urban, Teresa; Chibowski, S.; Medykowska, Magdalena; Nosal‐Wiercińska, Agnieszka; Franus, Wojciech; Panek, Rafał; Szewczuk-Karpisz, Katarzyna

doi:10.1007/s13204-020-01397-9

Cited by 17 publications

(8 citation statements)

References 33 publications

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“…This is mainly due to the overlapping of the diffusion parts of the electrical double layer formed on the opposite walls inside the relatively small solid pores. Such behavior was also observed for suspensions containing other zeolites [ 58 , 59 , 60 ].…”

Section: Resultssupporting

confidence: 61%

Simultaneous Removal of Pb2+ and Zn2+ Heavy Metals Using Fly Ash Na-X Zeolite and Its Carbon Na-X(C) Composite

et al. 2021

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Pure zeolite (Na-X) and a zeolite–carbon composite (Na-X(C)) were investigated as adsorbents of heavy metals—Pb2+ and Zn2+ from an aqueous solution. These materials were synthesized from fly ash—a waste from conventional hard coal combustion. Both solids were characterized using XRD, SEM-EDS, nitrogen adsorption/desorption, particle size and elemental composition analyses. The adsorption study was performed at pH 5 in the systems containing one or two adsorbates simultaneously. The obtained results showed that the pure zeolite was characterized by a more developed surface area (728 m2/g) than its carbon composite (272 m2/g), and the mean pore diameters were equal to 1.73 and 2.56 nm, respectively. The pure Na-X zeolite showed better adsorption properties towards heavy metals than its Na-X(C) composite, and Zn2+ adsorbed amounts were significantly higher than the Pb2+ ones (the highest experimental adsorption levels were: for Zn2+—656 and 600 mg/g, and for Pb2+—575 and 314 mg/g, on the Na-X and Na-X(C) surfaces, respectively). The zinc ions are exchanged with the cations inside the zeolite materials structure more effectively than lead ions with a considerably larger size. In the mixed systems, the competition between both heavy metals for access to the active sites on the adsorbent surface leads to the noticeable reduction in their adsorbed amounts. Moreover, the hydrochloric acid was a better desorbing agent for both heavy metals, especially Pb2+ one (desorption reached 78%), than sodium base (maximal desorption 25%).

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Section: Resultssupporting

confidence: 61%

Simultaneous Removal of Pb2+ and Zn2+ Heavy Metals Using Fly Ash Na-X Zeolite and Its Carbon Na-X(C) Composite

et al. 2021

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“…The ratio between the anisotropic and the quasi-isotropic components depends on the guest. However, for all guests the latter component dominates at 370 K. A similar composite peak was observed in the past for pyridine- 15 N loaded onto dry MCM-41. 71 The presence of the quasi-isotropic component is indicative of the roughness of the silica surface.…”

Section: ■ Results and Discussionsupporting

confidence: 84%

“…A surface is a nanoscale film placed on a solid or liquid support. In the former case, whether it is about proteins on nanoparticles, − innovative materials, − heterogeneous catalysis, , or today’s practical application, − it is about specific effects induced by the surface of a rigid host on a mobile and/or flexible guest for predetermined purposes. Silica is probably the most common host for inorganic, organic, and biomolecules .…”

Section: Introductionmentioning

confidence: 99%

For Whom a Puddle Is the Sea? Adsorption of Organic Guests on Hydrated MCM-41 Silica

Shenderovich

2020

Langmuir

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Thermal and hydration effects on the mobility of compact and branched organic molecules and a bulky pharmaceutical substance loaded in submonolayer amounts onto mesoporous silica have been elucidated using 1 H and 31 P solid-state NMR. In all cases, the ambient hydration has a stronger effect than an increase in temperature to 370 K for water-free silica. The effect of hydration depends on the guest and ranges from complete solvation to a silica−water−guest sandwich structure to a silica−guest/silica−water pattern. The mobility of the guests under different conditions has been described. The specific structure of the MCM-41 surface allows one to study very slow surface diffusion, a diffusivity of about 10 −15 −10 −16 m 2 /s. The data reported are relevant to any nonfunctionalized silica, while the method used is applicable to any phosphor-containing guest on any host.

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“…The isoelectric point's values (changing in the range 2.9-4.4) differ significantly from the corresponding pzc ones. The main reason for these differences is the permeation of the edl formed on the opposite pore walls of the adsorbent which changes the ionic composition of the diffusive part of the electrical double layer (Hunter 1981;Wiśniewska et al 2020). Moreover, some impurities present in the zeolitic structure (remaining in even small amounts after the preceding washing process of the solid with the doubly distilled water) can also affect the ionic composition of surface and slipping plane layers.…”

Section: Resultsmentioning

confidence: 99%

Study on electrical double layer nanostructure on zeolitic materials’ surface in the presence of impurities of different nature

Medykowska

Wiśniewska

Katarzyna-Szewczuk-Karpisz

et al. 2023

Appl Nanosci

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The aim of the research was to compare the adsorption mechanisms of heavy metal ions (Pb(II) and Zn(II)), as well as organic substances [diclofenac molecules and pol(acrylic acid) macromolecules on the surfaces of Na-X and Na-P1 synthetic zeolites as well their Na-X© and Na-P1© carbon composites]. The single and mixed adsorbate systems were considered. The more probable structures of the formed adsorption layers were proposed based on the results of the solid surface charge density and zeta potential experiments. The great applicability of the analysis of the parameters characterizing the electrical double layer in determination of the binding mechanism of simple inorganic ions and more complex organic molecules on the surface of the examined solids from the one- and two-component solutions was proved. Moreover, the changes of the surface and electrokinetic factors after the addition of the organic molecules enable specification of drug molecule orientation as well as the polymeric chain conformation at the solid/liquid interface.

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Investigation of adsorption mechanism of phosphate(V) ions on the nanostructured Na-A zeolite surface modified with ionic polyacrylamide with regard to their removal from aqueous solution

Cited by 17 publications

References 33 publications

Simultaneous Removal of Pb2+ and Zn2+ Heavy Metals Using Fly Ash Na-X Zeolite and Its Carbon Na-X(C) Composite

Simultaneous Removal of Pb2+ and Zn2+ Heavy Metals Using Fly Ash Na-X Zeolite and Its Carbon Na-X(C) Composite

For Whom a Puddle Is the Sea? Adsorption of Organic Guests on Hydrated MCM-41 Silica

Study on electrical double layer nanostructure on zeolitic materials’ surface in the presence of impurities of different nature

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