Sorption of lead(II) ions on natural coals and activated carbon: mechanistic, kinetic and thermodynamic aspects

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61988987%3A17310%2F16%3AA1701J30" target="_blank" >RIV/61988987:17310/16:A1701J30 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Sorption of lead(II) ions on natural coals and activated carbon: mechanistic, kinetic and thermodynamic aspects

Popis výsledku v původním jazyce

A sample of activated carbon and two natural coals were studied with respect to the sorption of lead(II) ions from aqueous solutions. Each sample was found to be governed by another immobilisation mechanism for lead(II) ions. For activated carbon AC, interactions of Pb(II) with C? electrons of graphene layers were mainly supposed to manifest a strong exothermic effect (-40 kJ mol-1) and a relatively low degree of reversibility (ca 30 %). Both natural coals were practically of the same acidity, ca 3 mmol g-1. However, only the subbituminous coal (sample H) proved the ion exchange/complexation mechanism as a principal type of lead(II) immobilisation. For such adsorption, full reversibility was experimentally confirmed with adsorption heat of -7 kJ mol-1. The adsorption capacity of sample H was found to be the lowest, representing only 0.08 mmol g-1. Contrary to this, oxidative altered bituminous coal (A) confirmed it had the highest sorption ability to lead(II) ions (ca 0.7 mmol g-1). Its immobilisation mechanism for lead(II) was found to arise mainly from action of a mineral matter in the coal. For such type of sorption, reversibility was found to be about 70 %, with only a slight exothermic heat effect (ca -2 kJ mol-1).

Název v anglickém jazyce

Sorption of lead(II) ions on natural coals and activated carbon: mechanistic, kinetic and thermodynamic aspects

Popis výsledku anglicky

A sample of activated carbon and two natural coals were studied with respect to the sorption of lead(II) ions from aqueous solutions. Each sample was found to be governed by another immobilisation mechanism for lead(II) ions. For activated carbon AC, interactions of Pb(II) with C? electrons of graphene layers were mainly supposed to manifest a strong exothermic effect (-40 kJ mol-1) and a relatively low degree of reversibility (ca 30 %). Both natural coals were practically of the same acidity, ca 3 mmol g-1. However, only the subbituminous coal (sample H) proved the ion exchange/complexation mechanism as a principal type of lead(II) immobilisation. For such adsorption, full reversibility was experimentally confirmed with adsorption heat of -7 kJ mol-1. The adsorption capacity of sample H was found to be the lowest, representing only 0.08 mmol g-1. Contrary to this, oxidative altered bituminous coal (A) confirmed it had the highest sorption ability to lead(II) ions (ca 0.7 mmol g-1). Its immobilisation mechanism for lead(II) was found to arise mainly from action of a mineral matter in the coal. For such type of sorption, reversibility was found to be about 70 %, with only a slight exothermic heat effect (ca -2 kJ mol-1).

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

CF - Fyzikální chemie a teoretická chemie

OECD FORD obor

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Projekt

<a href="/cs/project/LO1208" target="_blank" >LO1208: Teoretické aspekty energetického zpracování odpadů a ochrany prostředí před negativními dopady</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2016

Kód důvěrnosti údajů

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

Název periodika

Energy and Fuels

ISSN

0887-0624

e-ISSN

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Svazek periodika

30

Číslo periodika v rámci svazku

7

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

7

Strana od-do

5846-5853

Kód UT WoS článku

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EID výsledku v databázi Scopus

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