Investigation of acetone adsorption characteristics of activated carbons obtained from Zonguldak-Karadon coal at room temperature

Öz

Proje Numarası

BEUN BAP 2008-13-02-02

Zonguldak-Karadon kömüründen elde edilen aktif karbonların oda sıcaklığında aseton adsorpsiyon özelliklerinin incelenmesi

Öz

Zonguldak, Türkiye’nin en büyük taşkömürü yataklarının bulunduğu, sınırları içerisinde bir çok kömür maden ocağının yer aldığı Batı Karadeniz kıyısının önemli bir kömür kentidir. Bu çalışmada Zonguldak Karadon kömür ocağından alınan bitümlü kömür örneklerinden fiziksel ve kimyasal yöntemlerle elde edilen aktif karbonların oda sıcaklığındaki aseton adsorpsiyon özelliklerinin incelenmesi amaçlanmıştır. Aseton adsorpsiyonuna adsorbent hazırlama yöntemi, aktifleştirme ajanı (KOH, NaOH, ZnCl2 ve H3PO4) ve aktifleştirme sıcaklığının (400-800°C) etkileri incelenmiştir. Karadon kömüründen elde edilen farklı aktif karbonlar üzerinde aseton adsorpsiyon mekanizmasının açıklanması amacıyla, aseton adsorpsiyon denge verileri Brunauer-Emmett-Teller, Langmuir, Freundlich, Harkins-Jura, Dubinin-Radushkevich, Dubinin-Astakhov, Henderson, Halsey ve Smith olmak üzere farklı adsorpsiyon izoterm modelleriyle değerlendirilmiş, model parametreleri belirlenmiştir. Maksimum adsorpsiyon kapasitesini veren Langmuir adsorpsiyon modeli sabiti Wm 0,12-0,63 g/g değer aralığında bulunmuştur. Dubinin-Radushkevich modelinden hesaplanan adsorpsiyon karakteristik enerjisi E0’ın 2,87-29,80 kJ/mol aralığında olduğu belirlenmiştir. Kimyasal yöntemle elde edilen aktif karbonların fiziksel aktifleştirme yöntemiyle elde edilen aktif karbonlardan daha yüksek aseton adsorpsiyon kapasitesine sahip oldukları, aseton adsorpsiyon kapasitesinin genellikle toplam gözenek hacmi ile arttığı görülmüştür. Zonguldak-Karadon kömürünün KOH ile 700 ve 800°C’de aktifleştirilmesiyle elde edilen aktif karbonların sırasıyla % 45 ve % 45,99 ile en yüksek aseton adsorpsiyon kapasitesine sahip oldukları belirlenmiştir. Zonguldak-Karadon kömürünün kimyasal aktifleştirilmesiyle elde edilen aktif karbonların aseton adsorpsiyonu için oldukça etkin oldukları ve aseton buharlarının arıtılmasında ticari olarak yüksek bir potansiyele sahip adsorbentler olabilecekleri belirlenmiştir.

Anahtar Kelimeler

• kömür
• aktif karbon
• kimyasal aktifleştirme
• uçucu organik bileşikler
• aseton adsorpsiyonu

Destekleyen Kurum

Zonguldak Bülent Ecevit Universitesi

Proje Numarası

BEUN BAP 2008-13-02-02

Teşekkür

Bu çalışma Zonguldak Bülent Ecevit Universitesi (BEUN BAP 2008-13-02-02) ve Devlet Planlama Teşkilatı (DPT2003K121110) tarafından desteklenmiştir. Çalışmalarımız esnasındaki değerli katkıları ve destekleri nedeniyle değerli Hocalarımız Gazi Universitesi Kimya Mühendisliği Bölümü Öğretim Üyesi Prof. Dr. Gülşen DOĞU ve Orta Doğu Teknik Üniversitesi Kimya Mühendisliği Bölümü Öğretim Üyesi Prof. Dr. Timur DOĞU’ya en içten teşekkürlerimizi sunarız.

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