CO22_{2} adsorption behavior and kinetics on chemically modified activated   carbons

Burcu Selen ÇAĞLAYAN; Ahmet Erhan AKSOYLU

Makale detayları

CO22_{2} adsorption behavior and kinetics on chemically modified activated carbons

Yazarlar:

Burcu Selen ÇAĞLAYAN | Ahmet Erhan AKSOYLU

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Chemistry 2016 Vol.40 Issue 4, pp.576-587

Belge Tipi:

Makale

Yayın Tarihi:

7/2016

Belge Dili:

Türkçe

Document ID (Org No.):

2000726574

Sıklık:

İki Aylık

eISSN:

1303-6130

pISSN:

1300-0527

Özet:

 

CO22_{2} adsorption capacities of activated carbon-based   adsorbents subjected to different treatments, such as HNO33_{3} oxidation,   air oxidation, alkali impregnation, and heat treatment under helium gas   atmosphere, were determined by gravimetric analyses and reported previously   by our group. In the current work, the experimental adsorption isotherms of   these modified activated carbon samples were fitted to Langmuir, Freundlich,   and Dubinin--Radushkevich (D-R) models. The best fits were obtained to the   D-R equation, indicating competitive or multilayer CO22_{2} adsorption   occurring in the micropores of the adsorbents. Air oxidation followed by   alkali impregnation led to the highest micropore volume, ranging between   0.259 and 0.298 g.CO22_{2}/g.adsorbent, which resulted in the highest   CO22_{2} adsorption capacity of 8.87{\%} at 1 atm and 25 ∘∘^{\circ}C. The   CO22_{2} adsorption kinetic plots revealed a two-step adsorption process for   all the adsorbents: a relatively fast kinetic region phase followed by a   slow one until reaching the equilibrium. Pseudo-first and pseudo-second   order kinetics explain adsorption for the kinetic region for most of the   samples. When the whole adsorption data range is considered, the adsorption   cannot be explained by any model at 25 ∘∘^{\circ}C due to the complex nature   of the adsorbents, but the adsorption behavior fits rather well to   pseudo-first order kinetics at 120 ∘∘^{\circ}C for the alkali-impregnated   samples.

Makale detayları

CO22_{2} adsorption behavior and kinetics on chemically modified activated carbons

Yazarlar: Burcu Selen ÇAĞLAYAN | Ahmet Erhan AKSOYLU

Yayıncı: TUBITAK

Dergi: Turkish Journal of Chemistry 2016 Vol.40 Issue 4, pp.576-587

Belge Tipi: Makale

Yayın Tarihi: 7/2016

Belge Dili: Türkçe

Document ID (Org No.): 2000726574

Sıklık: İki Aylık

eISSN: 1303-6130

pISSN: 1300-0527

Sayı

Yazarlar:

Burcu Selen ÇAĞLAYAN | Ahmet Erhan AKSOYLU

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Chemistry 2016 Vol.40 Issue 4, pp.576-587

Belge Tipi:

Makale

Yayın Tarihi:

7/2016

Belge Dili:

Türkçe

Document ID (Org No.):

2000726574

Sıklık:

İki Aylık

eISSN:

1303-6130

pISSN:

1300-0527