Electrical double layer at the gibbsite/anionic polyacrylamide/supporting electrolyte interface – Adsorption, spectroscopy and electrokinetic studies

Szewczuk-Karpisz, Katarzyna; Krasucka, Patrycja; Boguta, Patrycja; Skic, Kamil; Sokołowska, Z.; Wiśniewska, Małgorzata

doi:10.1016/j.molliq.2018.04.030

Cited by 19 publications

(10 citation statements)

References 14 publications

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“…Gibbsite and goethite were also examined, but adsorbed polyacrylamide was characterized by different content of ionizable carboxylic groups (40%). At pH 5, AN PAM adsorbed amount measured for gibbsite, for initial polymer concentration 100 ppm, was equal to 1.76 mg/g, in turn for goethite-7.91 mg/g (Szewczuk-Karpisz et al 2018.…”

Section: Pb(ii) Ion and An Pam Adsorption Mechanism On The Kaolinite mentioning

confidence: 89%

Anionic polyacrylamide as a substance strengthening the Pb(II) immobilization on the kaolinite surface

Szewczuk-Karpisz

Wiśniewska

2019

Int. J. Environ. Sci. Technol.

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The main purpose of the study was to examine lead(II) ion immobilization on the kaolinite surface and determine the effect of soil flocculant (macromolecular compound) on this process. For this reason, the adsorption measurements of anionic polyacrylamide and/or Pb(II) ions on the kaolinite surface were performed. Moreover, the impact of heavy metal on electrokinetic and stability properties of kaolinite/polyacrylamide/supporting electrolyte system was determined. It was done based on the results of potentiometric titration, electrophoretic mobility, and absorbance measurements. The most important conclusions of the study were as follows: (1) kaolinite is an effective Pb(II) adsorbent when ion concentration in the environment equals 1 or 10 ppm (it adsorbs 80% and 72% of the ions, respectively), (2) when Pb(II) concentration in the environment is 100 ppm, kaolinite adsorbs only 29% of the ions, and (3) anionic polyacrylamide may strengthen the Pb(II) adsorption on the kaolinite surface (in the presence of 100 ppm AN PAM 30% and 1 ppm Pb(II), even 96% of the ions are adsorbed). Due to the above process, the bioavailability of heavy metal for organisms is considerably limited.

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Section: Pb(ii) Ion and An Pam Adsorption Mechanism On The Kaolinite mentioning

confidence: 89%

Anionic polyacrylamide as a substance strengthening the Pb(II) immobilization on the kaolinite surface

Szewczuk-Karpisz

Wiśniewska

2019

Int. J. Environ. Sci. Technol.

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“…Anionic polyacrylamide (PAM, Korona) was characterized by average molecular weight (M w ) equal to 13,000 kDa and 40% share of ionizable groups. Its pK a parameter was equal to 5.3, whereas the dissociation degree (α) was as follows: at pH 5-0.33, pH 5.3-0.5, pH 7-0.98, pH 9-0.99 (Szewczuk-Karpisz et al 2018). The solid and polymer characteristics are presented in Table 1.…”

Section: Methodsmentioning

confidence: 99%

“…This means that polyacrylamide was present on the solid surface. The spectrum obtained for polyacrylamide has been already published (Szewczuk-Karpisz et al 2018).…”

Section: The Pam Adsorption Amount On the Goethite Surfacementioning

confidence: 99%

Anionic polyacrylamide efficiency in goethite removal from aqueous solutions: goethite suspension destabilization by PAM

Szewczuk-Karpisz

Krasucka

Boguta

et al. 2018

Int. J. Environ. Sci. Technol.

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The main aim of the study was to investigate the anionic polyacrylamide (PAM) efficiency as a flocculant relative to goethite particles. This mineral is a toxic waste produced during hydrometallurgical processes and, as a result, poses a threat to the environment. In the experiments, the following analytical methods were applied: potentiometric titration, zeta potential and adsorption amount measurements, nitrogen adsorption/desorption isotherms, Fourier transform infrared spectroscopy, differential centrifugal sedimentation, UV/Vis spectrophotometry. The result analysis showed that polyacrylamide adsorbs on the goethite surface; however, its adsorption amount depends on the pH value. Due to the adsorbent-adsorbate electrostatic repulsion, the smallest number of macromolecules adsorbs at pH 9. The PAM adsorption affects the goethite surface charge and zeta potential values. It makes these parameters more negative. What is more regardless of pH value, the polymer addition contributes to clear aggregation of solid particles (suspension destabilization). Thus, PAM can be considered as a potential flocculant improving the goethite removal from aqueous wastes.

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“…8 the greatest reduction of the electrokinetic potential of AST88 particles occurs in the presence of DY142 whereas the smallest in case of AY219. The reduction of the electrokinetic potential in these systems results mainly from the anionic nature of the dyes, as well as from their specific arrangement at the solid-solution interface which can lead to the shift of the slipping plane from the surface of the mixed oxide particles (Szewczuk-Karpisz et al, 2018;Szewczuk-Karpisz et al, 2019). The largest effect observed for by containing system DY142 indicates that the dye molecules were located in the adsorption layer in the way which exposes a large number of negative sulphate groups towards the bulk solution.…”

Section: Effect Of Surfactant Addition On the Electrokinetic Propertimentioning

confidence: 99%

Alumina-silica-titania adsorbent for hazardous azo and phtalocyanine dyes removal from textile baths and wastewaters – the impact of ionic surfactants

Wiśniewska¹,

Wrzesińska²,

Wawrzkiewicz³

et al. 2020

Physicochem. Probl. Miner. Process.

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Two aspects of interfacial phenomena were discussed in the manuscript. The first one concerns the adsorptive removal of two azo dyes such as C.I. Acid Yellow 219 (AY219) and C.I. Direct Yellow 142 (DY142) as well as the phtalocyanine C.I. Reactive Blue 21 (RB21) on the alumina-silicatitania oxide (4% wt. Al2O3-8% wt. SiO2-88% wt. TiO2; AST88) in the ionic surfactants presence. The second one deals with the determination of interaction mechanism in the dyes-AST88, dyes-surfactant-AST88 systems using the data obtained from the surface charge density and zeta potential studies. The sodium dodecyl sulphate (SDS) with anionic character and hexadecyltrimethylammonium bromide (CTAB) with cationic ones were used. The adsorption capacities of 205.2 mg/g for AY219, 36.5 mg/g for RB21 and 18 mg/g for DY142. The potentiometric titration and Doppler laser electrophoresis methods enable determination of sign and magnitude of charge located in both the surface and the slipping plane layers around the solid particles. The structure of electrical double layer was determined in the AST88 systems without as well as with dyes and with mixed dye + surfactant adsorbates.

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Electrical double layer at the gibbsite/anionic polyacrylamide/supporting electrolyte interface – Adsorption, spectroscopy and electrokinetic studies

Cited by 19 publications

References 14 publications

Anionic polyacrylamide as a substance strengthening the Pb(II) immobilization on the kaolinite surface

Anionic polyacrylamide as a substance strengthening the Pb(II) immobilization on the kaolinite surface

Anionic polyacrylamide efficiency in goethite removal from aqueous solutions: goethite suspension destabilization by PAM

Alumina-silica-titania adsorbent for hazardous azo and phtalocyanine dyes removal from textile baths and wastewaters – the impact of ionic surfactants

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