完整後設資料紀錄
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dc.contributor.authorHuang, CPen_US
dc.contributor.authorCheng, WPen_US
dc.date.accessioned2019-04-02T06:00:01Z-
dc.date.available2019-04-02T06:00:01Z-
dc.date.issued1997-04-15en_US
dc.identifier.issn0021-9797en_US
dc.identifier.urihttp://dx.doi.org/10.1006/jcis.1997.4758en_US
dc.identifier.urihttp://hdl.handle.net/11536/149506-
dc.description.abstractIn this study, we describe the adsorption of ferricyanide (Fe(CN)(6)(3-)) on gamma-Al2O3 by a modified Langmuir adsorption isotherm. The modified Langmuir isotherm developed herein can accurately predict the apparent equilibrium constant (K-app) at different pH values and temperatures. In the experimental pH range of 5-6.5, adsorption capacity and apparent equilibrium constants decrease as the temperature increases. Because surface protonation increases as pH decrease, a more positively charged site on the surface increases the attraction force that exists between gamma-Al2O3 and the adsorbate. According to the Gibbs-Hehmholtz equation, these apparent equilibrium constants at various temperatures and pH conditions can be applied to determine enthalpy changes (Delta H-0) for the adsorption at different pH conditions. The result indicates that enthalpy change at different pH values is near -5 kcal/mol which indicates that the enthalpy change is in the order of hydrogen bonding and confirms the exothermic nature of the adsorption process. The results also indicate that other thermodynamic parameters change of ferricyanide adsorption. The positive entropy change (Delta S-0) has been explained from the viewpoint of exchange reaction in this study. The negative free energy change (Delta G(ads)(0)) for ferricyanide adsorption shows the spontaneous nature of the adsorption process. (C) 1997 Academic Press.en_US
dc.language.isoen_USen_US
dc.subjectadsorptionen_US
dc.subjectiron-cyanideen_US
dc.subjectferricyanideen_US
dc.subjectaluminum oxideen_US
dc.subjectfree energyen_US
dc.subjectentropyen_US
dc.subjectenthalpyen_US
dc.titleThermodynamic parameters of iron-cyanide adsorption onto gamma-Al2O3en_US
dc.typeArticleen_US
dc.identifier.doi10.1006/jcis.1997.4758en_US
dc.identifier.journalJOURNAL OF COLLOID AND INTERFACE SCIENCEen_US
dc.citation.volume188en_US
dc.citation.spage270en_US
dc.citation.epage274en_US
dc.contributor.department環境工程研究所zh_TW
dc.contributor.departmentInstitute of Environmental Engineeringen_US
dc.identifier.wosnumberWOS:A1997WW72500005en_US
dc.citation.woscount27en_US
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