Adsorption enthalpy of lead(II) and phenol on coals and activated carbon in the view of thermodynamic analysis and calorimetric measurements

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61988987%3A17310%2F18%3AA1901O9Z" target="_blank" >RIV/61988987:17310/18:A1901O9Z - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.jct.2017.08.026" target="_blank" >http://dx.doi.org/10.1016/j.jct.2017.08.026</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jct.2017.08.026" target="_blank" >10.1016/j.jct.2017.08.026</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Adsorption enthalpy of lead(II) and phenol on coals and activated carbon in the view of thermodynamic analysis and calorimetric measurements

Popis výsledku v původním jazyce

Comparison among adsorption enthalpies of thermodynamic analysis and these of direct calorimetric measurements is reported for sorption of lead(II) and phenol on natural coals and activated carbon. Thermodynamic calculations came out from developments of equilibrium adsorption isotherms recorded at 303 K, 333 K and 353 K. Standard adsorption enthalpies ?H0 were calculated from temperature dependences of equilibrium constants of adsorption Ka, with values of Ka being evaluated directly from experimental data and from fitted courses of the Langmuir and Freundlich isotherms. In addition, dependences of isosteric enthalpy on surface coverage were evaluated. Values of the exothermic enthalpies (ranging from -6 kJ mol-1 to -50 kJ mol-1) were obtained, however exclusive endothermic effect for lead(II) adsorption on a sample of natural coal (24 kJ mol-1) was also ascertained. Direct calorimetric measurements using flow and immersion techniques then proved that all the studied adsorptions proceed with exothermic effects from -2 kJ mol-1 to -42 kJ mol-1. It was found that experimental adsorption enthalpies correspond better to mean isosteric enthalpies in the interval 0 ? 1 mol kg-1 of the surface coverages than to the standard adsorption enthalpies ?H0 of the thermodynamic calculations.

Název v anglickém jazyce

Adsorption enthalpy of lead(II) and phenol on coals and activated carbon in the view of thermodynamic analysis and calorimetric measurements

Popis výsledku anglicky

Comparison among adsorption enthalpies of thermodynamic analysis and these of direct calorimetric measurements is reported for sorption of lead(II) and phenol on natural coals and activated carbon. Thermodynamic calculations came out from developments of equilibrium adsorption isotherms recorded at 303 K, 333 K and 353 K. Standard adsorption enthalpies ?H0 were calculated from temperature dependences of equilibrium constants of adsorption Ka, with values of Ka being evaluated directly from experimental data and from fitted courses of the Langmuir and Freundlich isotherms. In addition, dependences of isosteric enthalpy on surface coverage were evaluated. Values of the exothermic enthalpies (ranging from -6 kJ mol-1 to -50 kJ mol-1) were obtained, however exclusive endothermic effect for lead(II) adsorption on a sample of natural coal (24 kJ mol-1) was also ascertained. Direct calorimetric measurements using flow and immersion techniques then proved that all the studied adsorptions proceed with exothermic effects from -2 kJ mol-1 to -42 kJ mol-1. It was found that experimental adsorption enthalpies correspond better to mean isosteric enthalpies in the interval 0 ? 1 mol kg-1 of the surface coverages than to the standard adsorption enthalpies ?H0 of the thermodynamic calculations.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10403 - Physical chemistry

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

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

Rok uplatnění

2018

Kód důvěrnosti údajů

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

Název periodika

The Journal of Chemical Thermodynamics

ISSN

0021-9614

e-ISSN

—

Svazek periodika

116

Číslo periodika v rámci svazku

January

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

10

Strana od-do

97-106

Kód UT WoS článku

000418492900011

EID výsledku v databázi Scopus

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