Production and Characterization of Open-Celled Carbon Foams from Sawmill Waste

Öz

In recent years, studies on the preparation of low-cost carbon foam from renewable waste biomass as an alternative to non-renewable fossil fuel-based raw materials have attracted considerable attention. In this study, it is aimed i) to produce carbon foam from the tar of hornbeam sawdust, which is a sawmill waste; ii) to diversify the elemental composition, structural, morphological, and crystallographic properties of the product with the chemical activation process. Carbon foams with 78.88-88.37% higher carbon content were prepared compared to the elemental carbon content of the raw material (45.99%). It was determined that the pore size distribution of the carbon foam was more uniform with the activation process, and the surface area increased from 59,821 m2/g to 1004,184 m2/g, after all the crystal structure was preserved and foams with similar x-ray diffraction profiles were produced. In addition, it was observed that the compressive strength value decreased in response to the increased surface area due to cracks and breaks in the structure with the chemical activation process. In summary, it was concluded that the chemical activation process performed in the preparation of wood-based carbon foam considering the application area can significantly affect the product properties.

Anahtar Kelimeler

• Biopitch
• Carbon Foam
• Hornbeam Shavings
• Pyrolysis

Kereste Fabrikası Atığından Açık-Hücreli Karbon Köpük Üretimi ve Karakterizasyonu

Öz

Son yıllarda, yenilenemeyen fosil yakıt-esaslı hammaddelere alternatif olarak yenilenebilir atık biyokütleden düşük maliyetli karbon köpük hazırlanması üzerindeki çalışmalar oldukça dikkat çekmektedir. Bu kapsamda gerçekleştirilen çalışmada, i) kereste fabrikası atığı olan gürgen talaşının katranından karbon köpük üretilmesi; ii) ürünün elementel bileşiminin, yapısal, morfolojik ve kristalografik özelliklerinin kimyasal aktivasyon işlemi ile çeşitlendirilmesi amaçlanmıştır. Hammaddenin elementel karbon içeriği (%45,99) ile kıyaslandığında %78,88-88,37 oranında daha yüksek karbon içeriğine sahip karbon köpükler hazırlanmıştır. Aktivasyon işlemi ile karbon köpüğün gözenek boyut dağılımının daha homojen olduğu ve yüzey alanının 59,821 m2/g değerinden 1004,184 m2/g’a yükseldiği, buna rağmen kristal yapının korunduğu ve benzer x-ışını kırınım profillerine sahip köpüklerin üretildiği belirlenmiştir. Ayrıca, kimyasal aktivasyon işlemi ile yapıda oluşan çatlaklara ve kırılmalara bağlı olarak artan yüzey alanına karşılık basma dayanımı değerinin düştüğü gözlenmiştir. Özetle, uygulama alanı göz önünde bulundurularak odun-esaslı karbon köpük hazırlanmasında gerçekleştirilen kimyasal aktivasyon işleminin ürün özelliklerini önemli derecede etkileyebileceği sonucuna ulaşılmıştır.

Anahtar Kelimeler

• Biyozift
• Gürgen Talaşı
• Karbon Köpük
• Piroliz

Kaynakça

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