A BET approach to multilayer adsorption in swelling products

Pantuso, Francisco; Tolaba, Marcela P.; Aguerre, Roberto J.

doi:10.1016/j.jfoodeng.2013.07.036

Cited by 10 publications

(2 citation statements)

References 17 publications

(14 reference statements)

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“…Both BET and Freundlich model assume that adsorption sites have a distribution of energies (multi-site model) 60 . This suggests that RhB binding sites are divided into two regions; one region that supports complexation adsorption, and another region for cation exchange 61 .…”

Section: Resultsmentioning

confidence: 99%

Complex Formation via Hydrogen bonding between Rhodamine B and Montmorillonite in Aqueous Solution

Fang

Zhou

Yang

et al. 2018

Sci Rep

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This study investigates the adsorption mechanism differences among four nitrogenous dyes, sulforhodamine G (SRG), uncharged/deprotonated rhodamine B (RhB), orange II (Or II) and methyl blue (MB) by montmorillonite (MMT). MMT adsorption capacity for cationic MB was three times that of uncharged RhB and anionic SRG, while anionic Or II was not absorbed. Colloidal MMT particles have two types of surfaces, basal and edge, that interact with nitrogenous dyes very differently. The surface acidity of MMT was characterized with the pyridine adsorption method using in-situ diffuse reflectance infrared Fourier transform spectroscopy (in-situ DRIFTS). Adsorption of cationic MB was compared with the adsorption of RhB. In-situ attenuated total reflectance Fourier transform infrared (in-situ ATR-FTIR) spectroscopy indicated that a nitrogen atom on RhB complexes with a metal hydroxyl on an MMT edge through a water bridge. The highly polar edge hydroxyl is important to hydrogen bond formation. Cation ion exchange and washing experiments, as well as studies on the effect of temperature, pH and ionic strength on adsorption further clarified the adsorption mechanism. Our results provide insights into the effects of molecular structure on the adsorption of nitrogenous dyes by clay and the role of edge surfaces in the adsorption process.

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Section: Resultsmentioning

confidence: 99%

Complex Formation via Hydrogen bonding between Rhodamine B and Montmorillonite in Aqueous Solution

Fang

Zhou

Yang

et al. 2018

Sci Rep

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“…Bunlardan Tip I olarak tan›mlanan Langmuir izotermi, tipik bir kekleflmeyi önleyici yani antikek materyal izotermidir. Ço¤u g›da koligatif etki, kapiller etki ve yüzey-su etkileflimlerinin ortak bir sonucu olarak Tip II (sigmoidal, S tipi) izoterm gösterir (29,30). Tip III izotermi (J tipi), flekerler ve tuzlar gibi saf kristal kat›lar›n veya fleker içeri¤i yüksek g›dalar›n sorpsiyon izotermi olarak oluflur (18, 22, 31, 32).…”

Section: Sabi̇t Su Akti̇vi̇tesi̇ Ortamlarinin Sağlanmasi Ve Di̇kkat Edi̇lecek Hususlarunclassified

GIDALARIN NEM SORPSİYON İZOTERMLERİNİN BELİRLENMESİ ve EŞİTLİKLERİNİN ÇÖZÜMÜ

Erbaş¹,

Candal²,

Kılıç³

et al. 2016

GIDA

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ÖzetNem sorpsiyon izotermleri, sabit s›cakl›kta g›dan›n su içeri¤inin (m) g›dan›n su aktivitesine (a w ) karfl› grafik edilmesiyle (m=f(a w ) T ) oluflturulan ve g›dan›n durumu hakk›nda oldukça yaray›fll› bilgiler veren grafiklerdir. Bu nedenle g›dalar›n sorpsiyon izotermlerini temsil edebilmek için su aktivitesi, g›dan›n nem içeri¤i ve suyun ba¤lanma enerjisi aras›ndaki iliflkiyi dikkate alan; GAB, BET, Halsey, Henderson gibi çok say›da sorpsiyon eflitli¤i gelifltirilmifltir. Bu çal›flmada; sorpsiyon izotermlerin deneysel olarak belirlenmesi, sorpsiyon eflitlik sabitlerinin anlamlar› ve eflitliklerinin çözümü derlenmifltir.

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