Preparation of Activated Carbon from Natural Starch, its Characterization and Use as an Adsorbent

Öz

In this study, activated carbon was prepared from starch which is a natural substance by chemical activation method. Carbon spheres were obtained by hydrothermal carbonization of starch. Chemical activation process was carried out with NaOH at 800 oC. The effects of chemical activation on the structure and morphology of carbon spheres were evaluated using FT-IR, SEM and BET and zeta potential techniques. As a result of the activation process, the activated carbon having microporous (0,592 cm3/g) with high specific surface area (968 m2/g) was obtained. The potential of using activated carbon as an adsorbent for removal of congo red in water was investigated under several experimental conditions. Langmuir adsorption capacity of active carbon for congo red is 117,65 mg/g. Regeneration studies have shown that the activated carbon can also be used at least six times for the removal of congo red with no change in its adsorption capacity.

Anahtar Kelimeler

• Hydrothermal carbonization
• Activated carbon
• Congo red
• Adsorption

Doğal Bir Madde Olan Nişastadan Aktif Karbon Hazırlanması, Karakterizasyonu ve Adsorbent Olarak Kullanımı

Öz

Bu çalışmada, doğal bir madde olan nişastadan kimyasal aktivasyon yöntemi ile aktif karbon hazırlanmıştır. Nişastanın hidrotermal karbonizasyonu sonucu karbon kürecikler elde edilmiştir. Kimyasal aktivasyon işlemi 800 oC’de NaOH ile gerçekleştirilmiştir. Kimyasal aktivasyonun karbon küreciklerin yapısı ve morfolojisi üzerine etkileri FT-IR, SEM ve BET ve zeta potansiyeli teknikleri kullanılarak değerlendirilmiştir. Aktivasyon işlemi sonucunda, yüksek spesifik yüzey alanına (968 m2/g) sahip mikro gözenekli (0,592 cm3/g) aktif karbon elde edilmiştir. Aktif karbonun sudaki kongo kırmızısının giderimin de adsorbent olarak kullanılma potansiyeli farklı deneysel şartlar altında araştırılmıştır. Aktif karbonun kongo kırmızısı için Langmuir adsorpsiyon kapasitesi 117,65 mg/g’dir. Rejenarasyon çalışmaları aktif karbonun adsorpsiyon kapasitesinde bir değişiklik olmadan kongo kırmızısı giderimi için en az altı kez kullanılabilir olduğunu göstermiştir.

Anahtar Kelimeler

• Hidrotermal karbonizasyon
• Aktif karbon
• Kongo kırmızısı
• Adsorpsiyon

Kaynakça

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