Characterisation of a new mesoporous active nanocarbon obtained by hazelnut shell charcoal

Öz

In recent years, ordered porous carbon materials (OPCM) have critical application in many important fields because of their porous structure and huge spesific surface area. Some spesific properties of ordered porous carbon materials like low density, chemical stability, strong mechanical strength, and very good electrical conductivity provide using them in spesific and advenced technologic field. They get extensive usage area especially, as an electrod in electrochemistry, hydrogen storage, heterogen catalys, gas adsorbtion and as an adsorbent in seperation processing. Ordered porous materials are classified base on pore radius (a) microporous (pore size <2 nm), mesoporous (pore size >2 nm<50 nm) and macroporous (pore size > 50 nm). Traditional porous carbon materials like activated carbon and carbon molecular sieves are activated, via firstly carbonisation of charcoal, wood, fruit shell, fruit seed and natural polymers and then physical and chemical activation of them. In this study, fine granulated hazelnut shell was mixed together with SBA-15 consist of family of mesoporous silica nanoparticul (MSN) as a template, and then half of it carbonised again together in furnace at 900oC in nitrogen atmosphere (FC). Other half of it used without carbonisation(F). Obtained ordered porous carbon materials (FC and F) from hazelnut shell coal were characterised by thermal gravimetry (TG/DTA), N2 adsorbtion-desorbtion isoterm, X-ray powder diffraction, SEM/TEM and Elemental Analysis.

Anahtar Kelimeler

• Hazelnut shell charcoal
• carbonisation
• ordered porous carbon material
• activated carbon
• SBA-15
• template

Fındık kabuğu kömüründen elde edilen yeni mezo gözenekli aktif nanokarbonun eldesi ve karakterizastonu

Öz

Son yıllardaki bilimsel çalışmalar düzenli gözenekli karbon nano malzemeler, düzenli gözenekli yapıları ve oldukça büyük yüzey alanına sahip olmaları nedeniyle önemli uygulama alanları bulmaktadır. Gözenekli karbon materyallerin düşük yoğunluklu olmaları, kimyasal olarak kararlı olmaları, güçlü mekanik dayanımları ve çok iyi elektrik iletkenlikleri onların özel ve ileri teknolojik alanlarda kullanılmalarını sağlar. Özellikle elektrokimyada elektrod olarak, hidrojen depolama, heterojen kataliz, gaz adsorbsiyonu ve ayırma proseslerinde adsorban olarak geniş kullanım alanları bulmaktadır. Düzenli gözenekli nano materyaller gözenek yarıçaplarına göre; mikrogözenekli (gözenek boyutu <2 nm), mezogözenekli (gözenek boyutu >2 nm <50 nm) ve makrogözenekli (gözenek boyutu <50 nm) olarak sınıflandırılırlar. Aktif karbon ve karbon moleküler elek gibi gibi geleneksel gözenekli karbon materyaller kömür, odun, meyve kabuğu, meyve çekirdeği veya organik polimerlerin önce piroliz edilmeleri ardından fiziksel ya da kimyasal aktivasyonuyla elde edilirler. Çalışmamızda; karbon kaynağı olarak “öğütülmüş fındıkkabuğu kömürü”, şablon olarak bir mezogözenekli silika nanopartikül (MSN) olan “SBA-15” ile birlikte karıştırıldı, 900oClik fırında azot atmosferi altında tekrar karbonize edilerek düzenli mezogözenekli karbon nano materyali elde edildi. Elde edilen düzenli gözenekli karbon nano materyalin morfolojisi (yüzey özellikleri) ve bazı fizikokimyasal özellikleri; termal gravimetri (TG/DTA), N2 adsorbsiyon-desorbsiyon (Azot adsorbsiyon-desorbsiyon) izotermi (BET), X-ray powder diffraction, SEM/TEM ve elementel analiz yöntemleriyle aydınlatılmıştır.

Anahtar Kelimeler

• fındık kabuğu kömürü
• karbonizasyon
• gözenekli karbon materyali
• aktif karbon
• SBA-15
• şablon

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