Adsorption of Silver (I) From Aqueous Solution Using Chitosan/Montmorillonite Composite Beads

Jintakosol, Thanut; Nitayaphat, Walaikorn

doi:10.1590/1980-5373-mr-2015-0738

Cited by 38 publications

(13 citation statements)

References 34 publications

(36 reference statements)

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“…The isoelectric point of chitosan is in the pH range between 7 and 9 [ 27 ]. The adsorption of chitosan onto wool causes a shift of the isoelectric point (IEO) to the right (i.e., higher pH values).…”

Section: Resultsmentioning

confidence: 99%

Functionalized Wool as an Efficient and Sustainable Adsorbent for Removal of Zn(II) from an Aqueous Solution

Simonič

Zemljič

2020

Materials

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In this paper, the aim of the research was to obtain a highly efficient wool-based sorbent for the removal of zinc Zn(II) from wastewater. To increase the functional groups for metal binding, the wool was functionalized with chitosan. Chitosan has amino groups through which metals can be complexed easily to chelates. The physical and chemical modification of chitosan on wool was performed to analyze the influence of the coating bond on the final ability of the wool to remove metals. The presence of functional chitosan groups onto wool after adsorption was verified by attenuated total reflectance-Fourier transform infrared spectroscopy (ATR-FT-IR) spectra. The effective binding of chitosan to wool was also determined by potentiometric and polyelectrolyte titration methods. The latter titration was used to analyze the chitosan desorption. The main part of the study was the sorption of Zn(II) on natural and functionalized wool. The influence was investigated as a function of contact time, pH, metal ion concentration and temperature on the sorption process. The absorbent with the highest concentration of protonated amino groups (607.7 mmol/kg) and responding sorption capacity of 1.52 mg/g was obtained with wool physically modified by a macromolecular chitosan solution (1%) at pH = 7. Adsorption of Zn(II) onto pristine and modified wool corresponded to pseudo-second order kinetics (R2 > 0.9884). The Langmuir model was found to be more suitable (R2 > 0.9866) in comparison to the Freundlich model. The Zn(II) sorption process was spontaneous (∆G < 0) and exothermic (∆H < 0). The results found in this study are significant for escalating the possible use of wool modified with polysaccharide coatings as a sustainable source to improve or increase the metal sorption activity of wool.

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Section: Resultsmentioning

confidence: 99%

Functionalized Wool as an Efficient and Sustainable Adsorbent for Removal of Zn(II) from an Aqueous Solution

Simonič

Zemljič

2020

Materials

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“…However, in another study [20], even with pre-vortex-mixing, equilibrium in Ag concentration could not be reached in less than 6 hours, with the co-existence of Hg ions. On the other hand, for liquid-solid adsorption, typical equilibrium contact time ranges from 0.25 to 2.5 hours [22,31]. It should be noted, however, that this liquid-liquid sorption is still untapped.…”

Section: Resultsmentioning

confidence: 99%

“…Also, considering its attractive characteristic optical properties, unrivaled electrical and thermal conductivities, and reduction (electrochemical) potential of +0.8 V. Ag, as well as its compounds finds application in the making of jewelries and ornaments, in photography, in mirror production, in electronics (where it serves as ideal conductor for printed circuit boards), in electrochemistry (where it is used for battery electrode, for electroplating, as reference electrode in the 3-electrode testing system and in potentiometric pH measuring devices, as oxidation or corrosion resistant material), etc. [3,[21][22][23]. Moreover, Ag has inherent antimicrobial properties, and therefore used for disinfection, hygiene, personal care, and healthcare [24][25][26].…”

Section: Vegetable Oil + Alkanethiol → Thiolated Oilmentioning

confidence: 99%

Heavy metal sorption using thiolated oils of Elaeis guineensis and Glycine max

et al. 2020

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Sulphur-modification of matter confers improved heavy metal affinity and could be exploited in the treatment of heavy metal contaminated water. This paper is aimed at comparing the liquid-liquid Ag+ sorption capacities of normal and thiolated: palm oil (PO), palm kernel oil (PKO) and soybean oil (SBO), respectively. The vegetable oils were modified with 1-heptanethiol, and the thioether-functionalized (TF) oils were utilized for the removal of Ag+ present as a contaminant in water, while the unmodified oils acted as controls. The liquid-liquid equilibrium contact time was determined to be 6 hours. The result achieved after equilibration revealed the effectiveness of TF oils in the removal of Ag+ from a 600 ppm AgNO3 simulated water. While TF-SBO reduced the cation concentration to a level less than the detection limit, TF-PKO only showed appreciable sorption capacity (below 30%) relative to the normal oils. The order of Ag+ sorption capacity (TF-SBO > TF-PO > TF-PKO) was ascribed to various levels of unsaturation of fatty acid chains encountered in the lipids. A higher number of sorption-active TF sites is achievable with a greater degree of fatty acid unsaturation. On that note, highly unsaturated vegetable oils (such as that of Glycine max) were recommended.

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“…Hybrid composites based on organic polymers and organosilicon compounds are materials that combine the best properties of both synthetic and mineral adsorbents [1][2][3]. The presence of a functionalized organic polymer in their composition is responsible for the chemisorption activity, and the silicon unit determines the morphological characteristics, as well as enhanced mechanical and thermal stability.…”

Section: Introductionmentioning

confidence: 99%

Composite Polymer-Silicone Adsorbent for Platinum (IV) Ions: Investigation of Models and Absorption Kinetics

Лебедева¹,

Pozhidaev²,

Konovalenko³

et al. 2018

Proceedings of the International Symposium “Engineering and Earth Sciences: Applied and Fundamental Research” (ISEES 2018)

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The adsorption of platinum (IV) in hydrochloric acid solutions of a composite based on N,N-bis(3triethoxysilylpropyl)thiourea and 4-vinylpyridine-2-hydroxyethylethacrylate copolymer is studied. The value of the static adsorption capacity of the composite for platinum(IV) is found to be 215 mg/g. To describe the nature of the adsorption, Langmuir, Freundlich, and Dubinin-Radushkevich models are used. The adsorption kinetics is estimated using Boyd-Adamson models of pseudo-first and pseudo-second order and the Elovich equation.

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Adsorption of Silver (I) From Aqueous Solution Using Chitosan/Montmorillonite Composite Beads

Cited by 38 publications

References 34 publications

Functionalized Wool as an Efficient and Sustainable Adsorbent for Removal of Zn(II) from an Aqueous Solution

Functionalized Wool as an Efficient and Sustainable Adsorbent for Removal of Zn(II) from an Aqueous Solution

Heavy metal sorption using thiolated oils of Elaeis guineensis and Glycine max

Composite Polymer-Silicone Adsorbent for Platinum (IV) Ions: Investigation of Models and Absorption Kinetics

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