KIT-6 Üzerinde $CO_2$ Adsorpsiyon Davranışı ve Kinetiği Üzerine Bir Çalışma

KIT-6 mezogözenekli silika özgün üç boyutlu kanal ağı sayesinde kataliz, nano kaplar, adsorpsiyon ve ilaç taşıyıcı uygulamalarında kullanılmıştır. Tipik olarak KIT-6, asidik koşullar altında şablon yönlendirici ajanlar olarak triblok kopolimerlerinden hazırlanır. Bu makalede, KIT-6 bölümlenmiş kooperatif kendi kendine montaj yöntemi ile başarıyla sentezlenmiştir. Sentezlenen numune X-ışınları difraktometresi (XRD), termogravimetri/diferansiyel termal analiz (TG/DTA) ve $N_2$ adsorpsiyon/desorpsiyon kullanılarak karakterize edilmiştir. Karakterizasyon yöntemleri, sentezlenen numunenin yüksek yüzey alanlı (605.93$m^2$ $g^{-1}$ ), gözenek hacimli (0.58 $cm^3$ $cg^{-1}$ ) ve iyi termal stabiliteli düzenli KIT-6 mezoporöz silika olduğunu göstermiştir. Numunenin $CO_2$ adsorpsiyon çalışmaları farklı sıcaklıklarda (25, 75 ve 100°C) gerçekleştirilmiştir. Maksimum adsorpsiyon kapasitesi (0.65 $mmol^{-1}$ ) 25°C adsorpsiyon sıcaklığında gözlenmiştir. Ayrıca, adsorpsiyon sıcaklığının artmasıyla KIT-6’nın adsorpsiyon kapasitesinin azaldığı belirlenmiştir. Bu çalışma aynı zamanda birinci ve ikinci derece modelleri kullanarak KIT-6 üzerindeki $CO_2$ adsorpsiyon kinetiğinin araştırılmasını sunmaktadır. Numune üzerine $CO_2$ adsorpsiyonu için kinetik veriler, ikinci dereceden modele uymuştur. Aktivasyon enerjisi (Ea), KIT-6 mezoporöz silika üzerine $CO_2$ adsorpsiyonu için Arrhenious grafiğinden 18.75 kJ mol-1 olarak hesaplanmıştır. Ayrıca, KIT-6 mezoporöz silikanın yenilenebilirliği ve döngüsel stabilitesi TG/DTA analizi kullanılarak belirlenmiştir. Analiz sonuçlarından, düzenli mezoporöz silikanın, 4 adsorpsiyon/desorpsiyon döngüsünden sonra %94'lük mükemmel döngüsel stabiliteye sahip olduğu açıkça görülmüştür; bu, sentezlenen KIT-6'nın muhtemelen $CO_2$ adsorpsiyonunda bir adsorban olarak kullanılabileceğine işaret etmektedir.

A Study of $CO_2$ Adsorption Behaviour and Kinetics on KIT-6

KIT-6 mesoporous silica has been used in catalysis, nano containers, adsorption and drug delivery applications due to its original threedimensional channel network. Typically, KIT-6 is prepared from triblock copolymers as the template directing agents under acidicconditions. In this article, KIT-6 was successfully synthesized via partitioned cooperative self-assembly method. The synthesized samplewas characterized using X-ray diffraction (XRD), thermogravimetry/differential thermal analysis (TG/DTA) and $N_2$adsorption/desorption. The characterization methods demonstrated that the synthesized sample is ordered KIT-6 mesoporous silica witha high surface area (605.93 $m^2$ $g^{-1}$), pore volume (0.58 $cm^3$ $g^{-1}$), and good thermal stability. The $CO_2$ adsorption studies of the samplewere performed at different temperatures (25, 75 and 100°C). The maximum adsorption capacity (0.65 $mmol^{-1}$) was observed at 25°Cadsorption temperature. In addition, it was determined that the adsorption capacity of KIT-6 decreases with increasing adsorptiontemperature. This study also presents the investigation of the $CO_2$ adsorption kinetics on KIT-6 using the first order and the second ordermodels. The kinetic data for the $CO_2$ adsorption on the sample conformed to the second order model. The activation energy (Ea) wascalculated as 18.75 kJ $mol^{-1}$from Arrhenious plot for $CO_2$ adsorption on KIT-6 mesoporous silica. Moreover, the regenerability andcyclic stability of KIT-6 mesoporous silica was determined using TG/DTA analysis. From the analysis results, it wgas clearly seen thatthe ordered mesoporus silica has perfect cyclic stability of 94% after 4 adsorption/desorption cycle, which implies that the synthesizedKIT-6 could possibly used as an adsorbent in the $CO_2$ adsorption.

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