Investigation of mechanisms for simultaneous adsorption of iron and sulfate ions onto chitosan with formation of orthorhombic structures

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F20%3A10421864" target="_blank" >RIV/00216208:11310/20:10421864 - isvavai.cz</a>

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=qvsj_C_a9W" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=qvsj_C_a9W</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.colsurfa.2020.124575" target="_blank" >10.1016/j.colsurfa.2020.124575</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Investigation of mechanisms for simultaneous adsorption of iron and sulfate ions onto chitosan with formation of orthorhombic structures

Popis výsledku v původním jazyce

The study confirms the interaction of sulfate ions (SO42-) into the polymer chains of chitosan under acidic conditions. As a result the crystallinity of chitosan decreases with (1) increasing protonation of the amino groups and (2) increasing SO42- concentration. The adsorption of iron ions (Fe2+/3+) resulting from (FeSO4)(aq) onto the chitosan surface takes place incidentally by the oxidative effect of Fe2+/3+ with formation of orthorhombic alpha-FeOOH and gamma-FeOOH. The separation of iron and sulfate ions correlates stoichiometrically. Chitosan with different degrees of deacetylation (DD) were used in order to investigate the influence of DD on the adsorption behavior of iron and sulfate ions. The higher the DD of chitosan, the more iron and sulfate ions can be adsorbed. Langmuir isotherms showed good agreement with the adsorption data obtained (q(DD)=90 %(Fe) = 2.36 mmol g(-1); q(DD)=90 %(SO42-) = 2.58 mmol g(-1)). After adsorption process, the adsorber was analyzed extensively via X-ray diffraction, FTIR, C-13-NMR, SEM/EDX measurements and Mossbauer spectroscopy.

Název v anglickém jazyce

Investigation of mechanisms for simultaneous adsorption of iron and sulfate ions onto chitosan with formation of orthorhombic structures

Popis výsledku anglicky

The study confirms the interaction of sulfate ions (SO42-) into the polymer chains of chitosan under acidic conditions. As a result the crystallinity of chitosan decreases with (1) increasing protonation of the amino groups and (2) increasing SO42- concentration. The adsorption of iron ions (Fe2+/3+) resulting from (FeSO4)(aq) onto the chitosan surface takes place incidentally by the oxidative effect of Fe2+/3+ with formation of orthorhombic alpha-FeOOH and gamma-FeOOH. The separation of iron and sulfate ions correlates stoichiometrically. Chitosan with different degrees of deacetylation (DD) were used in order to investigate the influence of DD on the adsorption behavior of iron and sulfate ions. The higher the DD of chitosan, the more iron and sulfate ions can be adsorbed. Langmuir isotherms showed good agreement with the adsorption data obtained (q(DD)=90 %(Fe) = 2.36 mmol g(-1); q(DD)=90 %(SO42-) = 2.58 mmol g(-1)). After adsorption process, the adsorber was analyzed extensively via X-ray diffraction, FTIR, C-13-NMR, SEM/EDX measurements and Mossbauer spectroscopy.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10402 - Inorganic and nuclear chemistry

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2020

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Colloids and Surfaces A: Physicochemical and Engineering Aspects

ISSN

0927-7757

e-ISSN

—

Svazek periodika

592

Číslo periodika v rámci svazku

May

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

11

Strana od-do

124575

Kód UT WoS článku

000521956800021

EID výsledku v databázi Scopus

2-s2.0-85079739902