Adsorption and electrokinetic studies in kaolinite/anionic polyacrylamide/chromate ions system

Fijałkowska, Gracja; Wiśniewska, Małgorzata; Szewczuk-Karpisz, Katarzyna

doi:10.1016/j.colsurfa.2020.125232

Cited by 23 publications

(10 citation statements)

References 26 publications

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“…The core-shell architecture could be achieved by direct deposition of different types of natural/synthetic polyelectrolytes (CS, PEI, humic acid, PAH, PVAm, PAA, PSS etc.) on 2D-cores, such as GO [21][22][23]25,115,116] and Ti 3 C 2 -MXenes [117], or 3D-cores, including Fe 3 O 4 [57,108,122,123,126,127], SiO 2 [24,28,83,90,100,101,103,109], SiO 2 /Fe 3 O 4 [88,128], PS [91], FeS [129], clays [99,111,112], CaCO 3 [102], mesoporous diatomite [89], natural fibers [107] and sand [123]. The direct deposition of the organic or organic/inorganic "shell" onto inorganic or organic "core" could be carried out in (i) one-step, by physisorption [21,89,108,111,112], grafting [23,83,88,100,115,117], ionic or solvent gelation/precipitation [25,27,…”

Section: Core-shell Compositesmentioning

confidence: 99%

An Overview on Composite Sorbents Based on Polyelectrolytes Used in Advanced Wastewater Treatment

et al. 2021

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Advanced wastewater treatment processes are required to implement wastewater reuse in agriculture or industry, the efficient removal of targeted priority and emerging organic & inorganic pollutants being compulsory (due to their eco-toxicological and human health effects, bio-accumulative, and degradation characteristics). Various processes such as membrane separations, adsorption, advanced oxidation, filtration, disinfection may be used in combination with one or more conventional treatment stages, but technical and environmental criteria are important to assess their application. Natural and synthetic polyelectrolytes combined with some inorganic materials or other organic or inorganic polymers create new materials (composites) that are currently used in sorption of toxic pollutants. The recent developments on the synthesis and characterization of composites based on polyelectrolytes, divided according to their macroscopic shape—beads, core-shell, gels, nanofibers, membranes—are discussed, and a correlation of their actual structure and properties with the adsorption mechanisms and removal efficiencies of various pollutants in aqueous media (priority and emerging pollutants or other model pollutants) are presented.

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Section: Core-shell Compositesmentioning

confidence: 99%

An Overview on Composite Sorbents Based on Polyelectrolytes Used in Advanced Wastewater Treatment

et al. 2021

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“…Moreover, an acidic pH is favorable because of protons' (H + ) increase on the nanocellulose surface. Giving rise to a strong electrostatic attraction between the positively charged surface and the chromate ions (Fijałkowska et al 2020).…”

Section: Cr VI Sorption Based On Ph and Temperaturementioning

confidence: 99%

Remediation of contaminated water with Chromium VI by sorption in surface-activated-nanocellulose

Renata¹,

Bernardo²,

Patricia³

et al. 2021

Preprint

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Chromium VI is a frequent pollutant of industrial liquid effluents resulting from industrial waste. It is a substance classified into the carcinogen group I. In this study, a Cr VI sorption mechanism was developed by using nanocellulose beads (hydrogel) obtained from ivory nut. Cr VI was detected in water by a colorimetric method, using 1, 5-diphenylcarbazide at λ 540 nm. The sorption capacity of nanocellulose spheres was tested by varying the solution's pH and temperatures. Our results showed that nanocellulose can efficiently adsorb at pH 4 and 25°C. Removal percentages were between 91.29%(+/-1.36) and 95.33%(+/- 0.86) of the total Cr VI. The sorption kinetics showed that the material reaches equilibrium after 20–30 minutes. Additionally, an analysis of adsorption isotherms showed a high fit with the Langmuir and Freundlinch isotherms. Therefore, this method seem to be applied both to decontaminate industrial and drinking water employing an organic matrix such as nanocelullose beads.

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“…Consequently, a large number of studies are underway in various countries to discover low-cost and environmentally friendly materials for the removal of heavy metal pollutants from the aquatic environments 11 . Clay minerals have attracted much attention in recent years because of their availability, stable structure, and low price 12 , 13 . Numerous studies have proved that natural clay minerals and their modified products have unique physical and chemical properties, such as biocompatibility, non-toxicity, and antimicrobial activity, making them effective materials for removing various pollutants from aqueous media 14 , 15 .…”

Section: Introductionmentioning

confidence: 99%

Comparison of microscopic adsorption characteristics of Zn(II), Pb(II), and Cu(II) on kaolinite

Kai-bin

Chen

et al. 2022

Sci Rep

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In this research, kaolinite was used to investigate the comparative adsorption of copper, lead, and zinc ions through batch control experiments and first principles calculations. Different adsorption conditions were considered as the effect of solution acidity, initial concentration of ions, and contact shaking time. The adsorption system isotherms and kinetic studies were better agreed with the Langmuir and pseudo-second-order kinetic models. They reached adsorption equilibrium within two hours and maximum adsorption capacities of Zn(II), Pb(II), and Cu(II) on kaolinite were 15.515, 61.523, and 44.659 mg/g, respectively. In addition, the microscopic adsorption changes of Zn(II), Pb(II), and Cu(II) on kaolinite were characterized using X-ray diffraction, Fourier transform infrared spectroscopy, and scanning electron microscopy with energy dispersive X-ray spectroscopy. The results showed that Zn(II), Pb(II), and Cu(II) were most likely to be adsorbed on the kaolinite surface. Furthermore, the adsorption mechanism of [Zn(OH)]+, [Pb(OH)]+, and [Cu(OH)]+ on the kaolinite (001) surface was systematically studied through first-principles density functional calculations. The adsorption characteristics of different ions were evaluated by calculating the adsorption energy of the equilibrium adsorption configuration, state density, and electron density. The adsorption energy of [Zn(OH)]+, [Pb(OH)]+, and [Cu(OH)]+ were − 0.49, − 1.17, and − 1.64 eV, respectively. The simulation results indicated that new hybrid orbitals were formed between the metal ions and O atoms on the kaolinite surface, with electron transfer occurring the adsorption processes. The charge transfer direction for [Pb(OH)]+ was opposite those for [Zn(OH)]+ and [Cu(OH)]+. [Zn(OH)]+ was more likely to form polydentate complexes with hydroxyl groups on the kaolinite surface than [Cu(OH)]+ and [Pb(OH)]+. This work further elucidated the interaction mechanism between the adsorption systems and provided fundamental theoretical support for the structural modification and optimization of kaolinite, such as increasing the layer spacing of kaolinite and introducing other active groups on its surface to improve the adsorption capacity of heavy metal ions in water treatment and soil remediation.

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Adsorption and electrokinetic studies in kaolinite/anionic polyacrylamide/chromate ions system

Cited by 23 publications

References 26 publications

An Overview on Composite Sorbents Based on Polyelectrolytes Used in Advanced Wastewater Treatment

An Overview on Composite Sorbents Based on Polyelectrolytes Used in Advanced Wastewater Treatment

Remediation of contaminated water with Chromium VI by sorption in surface-activated-nanocellulose

Comparison of microscopic adsorption characteristics of Zn(II), Pb(II), and Cu(II) on kaolinite

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