Year 2020, Volume , Issue 19, Pages 48 - 55 2020-08-31

KIT-6 Üzerinde CO2 Adsorpsiyon Davranışı ve Kinetiği Üzerine Bir Çalışma
A Study of CO2 Adsorption Behaviour and Kinetics on KIT-6

Müge SARI YILMAZ [1]


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 N2 adsorpsiyon/desorpsiyon kullanılarak karakterize edilmiştir. Karakterizasyon yöntemleri, sentezlenen numunenin yüksek yüzey alanlı (605.93 m2 g-1), gözenek hacimli (0.58 cm3 g-1) ve iyi termal stabiliteli düzenli KIT-6 mezoporöz silika olduğunu göstermiştir. Numunenin CO2 adsorpsiyon çalışmaları farklı sıcaklıklarda (25, 75 ve 100°C) gerçekleştirilmiştir. Maksimum adsorpsiyon kapasitesi (0.65 mmol g-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 CO2 adsorpsiyon kinetiğinin araştırılmasını sunmaktadır. Numune üzerine CO2 adsorpsiyonu için kinetik veriler, ikinci dereceden modele uymuştur. Aktivasyon enerjisi (Ea), KIT-6 mezoporöz silika üzerine CO2 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 CO2 adsorpsiyonunda bir adsorban olarak kullanılabileceğine işaret etmektedir.

KIT-6 mesoporous silica has been used in catalysis, nano containers, adsorption and drug delivery applications due to its original three dimensional channel network. Typically, KIT-6 is prepared from triblock copolymers as the template directing agents under acidic conditions. In this article, KIT-6 was successfully synthesized via partitioned cooperative self-assembly method. The synthesized sample was characterized using X-ray diffraction (XRD), thermogravimetry/differential thermal analysis (TG/DTA) and N2 adsorption/desorption. The characterization methods demonstrated that the synthesized sample is ordered KIT-6 mesoporous silica with a high surface area (605.93 m2 g-1), pore volume (0.58 cm3 g-1), and good thermal stability. The CO2 adsorption studies of the sample were performed at different temperatures (25, 75 and 100°C). The maximum adsorption capacity (0.65 mmol g-1) was observed at 25°C adsorption temperature. In addition, it was determined that the adsorption capacity of KIT-6 decreases with increasing adsorption temperature. This study also presents the investigation of the CO2 adsorption kinetics on KIT-6 using the first order and the second order models. The kinetic data for the CO2 adsorption on the sample conformed to the second order model. The activation energy (Ea) was calculated as 18.75 kJ mol-1 from Arrhenious plot for CO2 adsorption on KIT-6 mesoporous silica. Moreover, the regenerability and cyclic stability of KIT-6 mesoporous silica was determined using TG/DTA analysis. From the analysis results, it was clearly seen that the ordered mesoporus silica has perfect cyclic stability of 94% after 4 adsorption/desorption cycle, which implies that the synthesized KIT-6 could possibly used as an adsorbent in the CO2 adsorption.

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Primary Language en
Subjects Engineering
Journal Section Articles
Authors

Orcid: 0000-0003-0441-7586
Author: Müge SARI YILMAZ (Primary Author)
Institution: YILDIZ TEKNİK ÜNİVERSİTESİ
Country: Turkey


Dates

Publication Date : August 31, 2020

APA Sarı Yılmaz, M . (2020). A Study of CO2 Adsorption Behaviour and Kinetics on KIT-6 . Avrupa Bilim ve Teknoloji Dergisi , (19) , 48-55 . DOI: 10.31590/ejosat.707874