The role of the oxygen functional groups in adsorption of copper (II) on carbon surface

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61988987%3A17310%2F20%3AA21024A6" target="_blank" >RIV/61988987:17310/20:A21024A6 - isvavai.cz</a>

Výsledek na webu

<a href="https://apps.webofknowledge.com/full_record.do?product=WOS&search_mode=GeneralSearch&qid=1&SID=E1Oczy5Sk8jTRxXQZD5&page=1&doc=1" target="_blank" >https://apps.webofknowledge.com/full_record.do?product=WOS&search_mode=GeneralSearch&qid=1&SID=E1Oczy5Sk8jTRxXQZD5&page=1&doc=1</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.scitotenv.2019.135436" target="_blank" >10.1016/j.scitotenv.2019.135436</a>

Jazyk výsledku

angličtina

Název v původním jazyce

The role of the oxygen functional groups in adsorption of copper (II) on carbon surface

Popis výsledku v původním jazyce

The effect of carbon surface oxidation on the adsorption of Cu(II) ions from aqueous solution was studied in order to explain the role of the oxygen functional groups in the binding of copper ions. Pristine carbonaceous adsorbent was oxidized to a various extent of oxygen uptake (Fenton-like oxidation < persulphate in H2SO4 < H2O2 in HNO3). Equilibrium adsorption tests were performed in acetate buffer at pH approximate to 5. The results show that the adsorption capacity of pristine adsorbent is expectable low (similar to 0.1 mmol g (1)). The oxidized samples adsorb Cu(II) at a considerably higher level of similar to 1.4 mmol g (1) despite the degree of surface oxidation. Analysis of the surface groups (FTIR, TPD) and surface charge (zeta potential) of used adsorbents and their Cu(II) saturated counterpart lead to the finding that Cu(II) ions are mostly bonded by complexation with the dissociated carboxylic groups (partly formed by anhydrides hydrolysis) probably in the form of Cu(Ac)(+) formed in the acetate buffer. The extent of dissociation is given by equilibrium pH during the adsorption and does not depend on the total amount of the surface groups. Thus, the content of active sites and consequently adsorption capacity is independent on the degree of oxidation when pH is kept constant. The results indicate that even moderate oxidation treatment of carbonaceous materials can produce highly effective adsorbents for Cu(II) immobilization.

Název v anglickém jazyce

The role of the oxygen functional groups in adsorption of copper (II) on carbon surface

Popis výsledku anglicky

The effect of carbon surface oxidation on the adsorption of Cu(II) ions from aqueous solution was studied in order to explain the role of the oxygen functional groups in the binding of copper ions. Pristine carbonaceous adsorbent was oxidized to a various extent of oxygen uptake (Fenton-like oxidation < persulphate in H2SO4 < H2O2 in HNO3). Equilibrium adsorption tests were performed in acetate buffer at pH approximate to 5. The results show that the adsorption capacity of pristine adsorbent is expectable low (similar to 0.1 mmol g (1)). The oxidized samples adsorb Cu(II) at a considerably higher level of similar to 1.4 mmol g (1) despite the degree of surface oxidation. Analysis of the surface groups (FTIR, TPD) and surface charge (zeta potential) of used adsorbents and their Cu(II) saturated counterpart lead to the finding that Cu(II) ions are mostly bonded by complexation with the dissociated carboxylic groups (partly formed by anhydrides hydrolysis) probably in the form of Cu(Ac)(+) formed in the acetate buffer. The extent of dissociation is given by equilibrium pH during the adsorption and does not depend on the total amount of the surface groups. Thus, the content of active sites and consequently adsorption capacity is independent on the degree of oxidation when pH is kept constant. The results indicate that even moderate oxidation treatment of carbonaceous materials can produce highly effective adsorbents for Cu(II) immobilization.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10406 - Analytical chemistry

Projekt

—

Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2020

Kód důvěrnosti údajů

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

Název periodika

SCI TOTAL ENVIRON

ISSN

0048-9697

e-ISSN

—

Svazek periodika

711

Číslo periodika v rámci svazku

duben

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

9

Strana od-do

135436

Kód UT WoS článku

000509344700130

EID výsledku v databázi Scopus

2-s2.0-85076754486