Selective adsorption of silver(I) ions over copper(II) ions on a sulfoethyl derivative of chitosan / Petrova Yulia S.,Pestov Alexandr V.,Usoltseva Maria K.,Neudachina Ludmila K. // JOURNAL OF HAZARDOUS MATERIALS. - 2015. - V. 299, l. . - P. 696-701.

ISSN/EISSN:

0304-3894 / 1873-3336

Type:

Article

Abstract:

This study presents a simple and effective method of preparation of N-(2-sulfoethyl) chitosan (NSE-chitosan) that allows obtaining a product with a degree of modification up to 1.0. The chemical structure of the obtained polymers was confirmed by FT-IR and 1H NMR spectroscopies. Cross-linking of N-(2-sulfoethyl) chitosans by glutaraidehyde allows preparation of sorbents for removal and concentration of metal ions. Capacity of sorbents towards hydroxide ions was determined depending on the degree of sulfoethylation under static and dynamic conditions. Dissociation constants of functional amino groups of the analyzed sorbents were determined by potentiometric titration. It was shown that basicity of the amino groups decreased (wherein pKa decreased from 6.53 to 5.67) with increase in degree of sulfoethylation. It explains the significant influence of sulfo groups on selectivity of sorption of metal ions on N-(2-sulfoethyl) chitosan-based sorbents. The investigated substances selectively remove copper(II) and silver(I) ions from solutions of complex composition. Wherein the selectivity coefficient KAgica increased to 20 (pH 6.5, ammonium acetate buffer solution) with increase in degree of sulfoethylation of the sorbent up to 1.0. (C) 2015 Elsevier B.V. All rights reserved.

Author keywords:

Chitosan; Sulfoderivatives; Sorption; Selectivity; Silver(I) CHEMICALLY-MODIFIED CHITOSAN; METAL-IONS; PROTONATION CONSTANTS; CU(II) IONS; SORPTION PROPERTIES; IMINODIACETIC ACID; CHELATING RESINS; AQUEOUS-SOLUTION; REMOVAL; WATER

DOI:

10.1016/j.jhazmat.2015.08.001

Web of Science ID:

ISI:000367411000077

Соавторы в МНС:

Другие поля

Поле	Значение
Month	DEC 15
Publisher	ELSEVIER SCIENCE BV
Address	PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
Language	English
EISSN	1873-3336
Keywords-Plus	CHEMICALLY-MODIFIED CHITOSAN; METAL-IONS; PROTONATION CONSTANTS; CU(II) IONS; SORPTION PROPERTIES; IMINODIACETIC ACID; CHELATING RESINS; AQUEOUS-SOLUTION; REMOVAL; WATER
Research-Areas	Engineering; Environmental Sciences \& Ecology
Web-of-Science-Categories	Engineering, Environmental; Environmental Sciences
Author-Email	petrova.yu.s@mail.ru
Funding-Acknowledgement	Government of the Russian Federation {[}02.A03.21.0006]; Russian Federation {[}MKMK-7702.2015.3]
Funding-Text	This research project has been supported by Act 211 Government of the Russian Federation No. 02.A03.21.0006, and grant of the President of the Russian Federation MKMK-7702.2015.3.
Number-of-Cited-References	56
Usage-Count-Last-180-days	5
Usage-Count-Since-2013	40
Journal-ISO	J. Hazard. Mater.
Doc-Delivery-Number	CZ9IJ