Qhov txawv ntawm Freundlich thiab Langmuir adsorption isotherms yog tias Freundlich adsorption isotherm yog empirical, whereas Langmuir adsorption isotherm yog theoretical.
Lub adsorption isotherm yog thawj txoj hauv kev uas peb tuaj yeem siv los kwv yees lub peev xwm adsorption ntawm ib yam khoom. Muaj ob txoj hauv kev rau qhov no: Freundlich thiab Langmuir adsorption isotherms. Cov no tseem ceeb heev hauv kev cuam tshuam nrog kev tiv thaiv ib puag ncig thiab cov txheej txheem adsorption.
Freundlich Adsorption Isotherms yog dab tsi?
Freundlich adsorption isotherm yog qhov ntsuas ntawm qhov sib txawv ntawm qhov ntau ntawm cov pa adsorbed los ntawm ib chav tsev loj ntawm cov khoom adsorbent nrog kev hloov hauv siab ntawm lub kaw lus rau qhov ntsuas kub. Qhov ntawd txhais tau tias; Qhov sib txawv, nyob rau hauv cov ntaub ntawv no, yog kom muaj nuj nqis ntawm cov pa roj thiab siab, thaum lub loj ntawm cov khoom adsorbent thiab kub nyob twj ywm. Kev qhia lej ntawm Freundlich adsorption isotherm yog raws li hauv qab no:
x/m=kP(1/n)
Qhov twg x yog qhov loj ntawm cov pa adsorbed, m yog qhov loj ntawm cov adsorbent siv, P yog lub siab ntawm lub cev, k thiab n yog qhov tsis tu ncua. Feem ntau, Freundlich adsorption isotherm yog muab rau hauv cov duab sawv cev. Yog li ntawd, peb thawj zaug yuav tsum rov kho cov kab zauv saum toj no kom nws haum rau ib daim duab. Nyob ntawd, peb tuaj yeem nqa lub logarithm ntawm tag nrho cov nqi. Ces qhov sib npaug yog raws li nram no.
Log(x/m)=log k + (1/n) log P
Yog li ntawd, x-axis ntawm daim duab yog log (x / m), y-axis yog log P, thiab txoj kab nqes yog (1 / n). Qhov cuam tshuam ntawm daim duab yog log k.
Daim duab 01: Freundlich Adsorption Isotherm Graph rau Acetic Acid
Langmuir Adsorption Isotherms yog dab tsi
Langmuir adsorption isotherm yog txoj hauv kev siv los kwv yees cov kab tawm adsorption ntawm qis adsorption ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom. Nws yog ib qho kev qhia theoretical thiab cov tshuaj sib npaug rau cov lus no yog raws li hauv qab no:
X/M=abc(1 + ac)
Qhov twg, X yog qhov hnyav ntawm cov kua nplaum, M yog qhov loj ntawm cov adsorbent, c yog qhov sib npaug ntawm cov kuab tshuaj, a thiab b yog qhov tsis tu ncua. Ntxiv mus, Langmuir adsorption isotherm yog siv rau monolayer adsorption rau ib homogeneous nto. Txawm li cas los xij, yuav tsum tsis txhob muaj kev cuam tshuam ntawm hom adsorbed.
Qhov txawv ntawm Freundlich thiab Langmuir Adsorption Isotherms yog dab tsi?
Muaj ob lub ntsiab adsorption isotherms li Freundlich adsorption isotherm thiab Langmuir adsorption isotherm. Freundlich adsorption isotherm yog qhov ntsuas ntawm qhov sib txawv ntawm qhov ntau ntawm cov pa adsorbed los ntawm ib chav tsev loj ntawm cov khoom adsorbent nrog kev hloov hauv siab ntawm lub kaw lus rau qhov muab kub. Langmuir adsorption isotherm yog txoj kev siv los kwv yees cov kab tawm adsorption ntawm cov adsorption tsawg ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom. Qhov sib txawv tseem ceeb ntawm Freundlich thiab Langmuir adsorption isotherms yog tias Freundlich adsorption isotherm yog empirical, tab sis Langmuir adsorption isotherm yog theoretical. Ntxiv mus, tus qub yog ib tug graphical sawv cev thaum lub tom kawg yog ib tug lej qhia los ntawm equation.
Cov infographic hauv qab no qhia txog qhov sib txawv ntawm Freundlich thiab Langmuir adsorption isotherms.
Summary – Freundlich vs Langmuir Adsorption Isotherms
Freundlich adsorption isotherm yog qhov ntsuas ntawm qhov sib txawv ntawm qhov ntau ntawm cov pa adsorbed los ntawm ib chav tsev loj ntawm cov khoom adsorbent nrog kev hloov hauv siab ntawm lub kaw lus rau qhov ntsuas kub. Langmuir adsorption isotherm, ntawm qhov tod tes, yog txoj kev siv los kwv yees cov kab tawm adsorption ntawm qhov tsis tshua muaj adsorption ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom. Qhov sib txawv tseem ceeb ntawm Freundlich thiab Langmuir adsorption isotherms yog tias Freundlich adsorption isotherm yog empirical whereas Langmuir adsorption isotherm yog theoretical.
