A batch experiment was conducted to study the effect of temperature (20 and 35ºC) on the adsorption of arsenic on soil having high clay, organic matter and free iron. The adsorption increased with increasing temperature but the change in enthalpy, ∆H, is coming negative upon calculating the thermodynamic parameters, which implies the reaction to be an exothermic one. Is there any plausible explanation for this?
I am neither a connoisseur nor an expert in this field.
I work in empirical modelling.
Sometimes you have to explore the nonlinear behavior with temperature where the parameters depend with temperature, and you have to know which optimal temperature to choose.
https://www.researchgate.net/publication/367534831_Modeling_of_the_relationship_between_the_thermodynamic_parameters_DH_and_DS_with_temperature_in_the_removal_of_Pb_ions_in_aqueous_medium_Case_study
I hope the experimenters give you direct solutions.
Noureddine Ouerfelli what were the used values for Kd in the calculations?
Dear Thomas Mayer-Gall
It's not me who asked this question.
I am neither a connoisseur nor an expert in this field.
I work in empirical modelling by proposing some empirical expressions for these colleagues of for other disciplines, when it's possible..
Nevertheless, I notice that some experimenters use different formulae and make some mistakes especially in thermodynamic parts.
https://www.researchgate.net/publication/297609583_Are_the_thermodynamic_parameters_correctly_estimated_in_liquid-phase_adsorption_phenomena?_iepl%5BgeneralViewId%5D=gHRqgnCS8wEW7qOiNMug0sNvYPdieA1K49l8&_iepl%5Bcontexts%5D%5B0%5D=searchReact&_iepl%5BviewId%5D=cM71rt36l45ICGrmEVajvZk6Vv6awTUzS6n4&_iepl%5BsearchType%5D=publication&_iepl%5Bdata%5D%5BcountLessEqual20%5D=1&_iepl%5Bdata%5D%5BinteractedWithPosition1%5D=1&_iepl%5Bdata%5D%5BwithEnrichment%5D=1&_iepl%5Bposition%5D=1&_iepl%5BrgKey%5D=PB%3A297609583&_iepl%5BtargetEntityId%5D=PB%3A297609583&_iepl%5BinteractionType%5D=publicationTitle
https://www.researchgate.net/publication/310748996_Determination_of_thermodynamic_parameters_from_Langmuir_isotherm_constant-revisited
Noureddine Ouerfelli i looked into your paper, and Kd is an essential parameter for the thermodynamik.
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