Qhov sib txawv tseem ceeb ntawm adsorption thiab desorption yog qhov adsorption yog hais txog cov txheej txheem uas qee cov khib nyiab tuav cov molecules ntawm cov roj los yog kua los yog kua nplaum ua ib zaj duab xis nyias, whereas desorption yog hais txog kev tso tawm ntawm cov khoom adsorbed los ntawm ib tug nto.
Adsorption thiab desorption yog cov txheej txheem tshuaj lom neeg uas cuam tshuam rau ib leeg. Peb tuaj yeem soj ntsuam cov txheej txheem no hauv ntau lub tshuab lom neeg, lub cev thiab tshuaj lom neeg. Nws tuaj yeem tshwm sim los yog peb tuaj yeem ua adsorption thiab desorption rau kev sim tshuaj.
Adsorption yog dab tsi?
Adsorption yog hais txog cov txheej txheem uas qee cov khib nyiab tuav cov roj los yog cov kua los yog cov kua nplaum ua cov zaj duab xis nyias. Yog li ntawd, nws yog cov txheej txheem ntawm adhesion ntawm molecules rau ntawm qhov chaw. Cov khoom uas yuav txuas rau saum npoo yog hu ua "adsorbate". Cov khoom uas muaj qhov chaw rau kev nqus yog hu ua "adsorbent". Cov txheej txheem adsorption yog qhov tshwm sim saum npoo. Desorption yog qhov thim rov qab ntawm adsorption.
Daim duab 01: Cov pa roj carbon activated yog ib qho zoo adsorbent
Tsis tas li ntawd, adsorption yog qhov tshwm sim ntawm lub zog saum npoo. Peb tuaj yeem faib cov adsorption ua ob pawg ua chemisorption thiab physisorption. Chemisorption tshwm sim vim covalent bonding ntawm adsorbent thiab adsorbate thaum physisorption tshwm sim vim tsis muaj zog Van der Waal rog. Txawm li cas los xij, qee zaum adsorption tshwm sim vim electrostatic attraction ntawm adsorbent thiab adsorbate.
Feem ntau, qhov adsorption ntawm cov pa roj thiab cov kuab tshuaj tau piav qhia los ntawm isotherms. Nws piav qhia txog tus nqi ntawm adsorbate ntawm lub adsorbent raws li kev ua haujlwm ntawm lub siab ntawm cov pa lossis nws cov concentration ntawm qhov kub thiab txias.
Desorption yog dab tsi?
Desorption yog hais txog kev tso tawm cov khoom adsorbed los ntawm qhov chaw. Qhov no yog tus txheej txheem rov qab ntawm sorption. Desorption tshwm sim nyob rau hauv ib tug system uas muaj ib lub xeev ntawm sorption equilibrium ntawm tej theem thiab adsorbing nto. Yog li ntawd, yog hais tias peb txo cov concentration ntawm cov tshuaj nyob rau hauv tej theem, ib co ntawm cov sorbed tshuaj hloov mus rau tej lub xeev. Hauv chromatography, lub desorption yog cov txheej txheem uas pab lub zog ntawm lub xov tooj ntawm tes.
Tom qab desorption tshwm sim, cov khoom desorbed tseem nyob ntawm substrate ze li ntawm qhov tsis muaj qhov kawg yog tias qhov kub thiab txias tseem qis. Txawm li cas los xij, thaum kub nce, desorption yuav tshwm sim. Qhov sib npaug dav rau tus nqi desorption yog raws li hauv qab no.
R=rNx
Qhov twg R yog tus nqi desorption, r yog tus nqi tas li, N yog kev sib tham ntawm cov khoom siv adsorbed thiab x yog qhov kev txiav txim kinetic ntawm cov tshuaj tiv thaiv. Muaj ob peb txoj hauv kev uas desorption tuaj yeem tshwm sim. Piv txwv li, thermal desorption, reductive desorption, oxidative desorption, electron-stimulated desorption, thiab lwm yam.
Qhov txawv ntawm Adsorption thiab Desorption yog dab tsi?
Adsorption thiab desorption yog cov txheej txheem tshuaj lom neeg uas cuam tshuam rau ib leeg. Qhov sib txawv tseem ceeb ntawm adsorption thiab desorption yog tias adsorption yog hais txog cov txheej txheem uas qee cov khoom tuav cov roj los yog kua los yog kua nplaum ua ib zaj duab xis nyias thaum desorption hais txog kev tso tawm ntawm cov khoom adsorbed los ntawm qhov chaw. Ntxiv mus, adsorption cuam tshuam nrog kev tsim cov ntawv cog lus los yog txuas los ntawm Van der Waal rog thaum desorption cuam tshuam nrog kev tawg ntawm covalent bonds lossis cov rog txaus nyiam.
Cov infographic hauv qab no qhia txog qhov sib txawv ntawm adsorption thiab desorption.
Summary – Adsorption vs Desorption
Adsorption thiab desorption yog cov txheej txheem tshuaj lom neeg uas cuam tshuam rau ib leeg. Qhov sib txawv tseem ceeb ntawm adsorption thiab desorption yog tias adsorption yog hais txog cov txheej txheem uas qee cov khoom tuav cov roj los yog kua los yog kua nplaum ua ib zaj duab xis nyias, qhov desorption hais txog qhov tso tawm ntawm cov khoom adsorbed los ntawm qhov chaw.
