Okaliptus Kök Odunun iki Aşamalı Üretim Yöntemi ile Aktif Karbon Üretiminde Değerlendirilmesi

Öz

Bu çalışmada, lignoselülozik atıklar aktif karbon üretiminde kullanılmıştır. Lignoselülozik Atık olarak Mersin Karaburacak bölgesinde yetiştirilen okaliptüs ağaçlarının (Eucalyptus grandis) kesim sonrasında toprak yüzeyde kalan kök atıkları değerlendirilmiştir. Bu amaçla okaliptüs ağacının kök odunu öğütüldükten sonra boyutlandırılmış ve 40 mesh odun unu kullanılmıştır. Aktif karbon üretimi iki aşamada gerçekleştirilmiştir. Bunun için kök odun unu ilk olarak kapalı bir otoklavda 200°C ve 225°C'de 24 saat boyunca suyun kritik noktasından yararlanılarak hidrotermal aşamada karbonize edilmiştir. Daha sonra piroliz aşamasında 400°C, 500°C, 600°C ve 700°C'de 30 dakika süreyle azot ortamında aktif karbonlar üretilmiştir. Aktif karbon numunelerinin verim hesaplamaları, taramalı elektron mikroskobu (SEM), Brunauer -Emmett - Teller (BET) ve Brunauer -Emmett - Teller (BET) analizleri yapılmıştır. Elde edilen sonuçlara göre, iki aşamalı proses kullanılarak 700 ℃'de üretilen aktif karbonların yüzey alanı 267,08 m2/g olarak elde edilmiştir. Elde edilen SEM görüntülerine göre aktif karbonların kısmen gözenekli bir yapıya sahip olduğu anlaşılmıştır. Düşük sıcaklıklardaki proliz işlemi aktif karbonun yapısında O/C ve H/C oranlarının daha yüksek olmasını ve fonksiyonel grupların daha fazla olmasını sağlamıştır. Ancak sıcaklık yükseldikçe aktif karbonun yapısndaki hidrojen ve oksijen oranları azalmıştır. Sonuç olarak okaliptüs kök odunlarının iki aşamalı hidrotermal ve piroliz yöntemleri kullanılarak yüksek yüzey alanına ve oksitlenmiş fonksiyonel gruplara sahip aktif karbonların üretilebileceği anlaşılmıştır.

Anahtar Kelimeler

• Hydrothermal Carbonization
• Pyrolysis
• Eucalyptus Root Wood

Evaluation of Eucalyptus Root Wood in Activated Carbon Production with Two-Stage Production Method

Abstract

In this study, lignocellulosic wastes were utilized in activated carbon production. The root wastes remaining on the soil surface after cutting of eucalyptus trees (Eucalyptus grandis) grown in Mersin Karabucak region were evaluated as lignocellulosic raw materials. For this purpose, the root wood of the eucalyptus tree (Eucalyptus grandis) was sized after grinding and 40 mesh wood flour was used. Activated carbon production was carried out in two stages. For this, the root wood flour was firstly carbonized in a closed autoclave at 200℃ and 225℃ for 24 hours in the hydrothermal stage by utilizing the subcritical point of water. Afterward, activated carbons were produced in the pyrolysis stage at 400℃, 500℃, 600℃ and 700℃ for 30 minutes in nitrogen environment. The yield calculations, scanning electron microscopy (SEM), Brunauer -Emmett - Teller (BET), and Brunauer -Emmett - Teller (BET) analyses of the activated carbon samples were performed. According to the results obtained, the surface area of the activated carbons produced at 700 ℃ using the two-step process was obtained as 267.08 m2/g. According to the SEM images obtained, it was understood that the activated carbons had a partially porous structure. Pyrolysis process at low temperatures ensured higher O/C and H/C ratios and more functional groups in the structure of activated carbon. However, as the temperature increased, the hydrogen and oxygen ratios in the structure of activated carbon decreased. As a result, it is understood that activated carbons with high surface area and oxidized functional groups can be produced by using two-stage hydrothermal and pyrolysis methods of eucalyptus root woods.

Keywords

• Hydrothermal Carbonization
• Pyrolysis
• Eucalyptus Root Wood

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