INVESTIGATING REMOVAL OF TRIMETHYLXANTHINE BY ACTIVATED CARBON PREPARED FROM PET WASTE
Küçük Resim Yok
Tarih
2012
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Parlar Scientific Publications (P S P)
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
Activated carbon (BK) has been prepared from polymeric wastes by chemical activation with KOH. Adsorption of trimethylxanthine onto BK was investigated with variations of pH, contact time, trimethylxanthine concentration, and temperature. The results were analyzed by the Langmuir and Freundlich equations. Adsorption of trimethylxanthine (caffeine) onto BK follows the Langmuir isotherm model. The kinetics of trimethylxanthine adsorption has been discussed using three kinetic models, i. e., the pseudo first-order, the pseudo second-order, and the intraparticle diffusion models. The kinetic studies showed that the adsorption followed a pseudo second-order reaction. The intraparticle diffusion rate constant, the external mass transfer coefficient, film and pore diffusion coefficients at various temperatures were evaluated. The thermodynamic parameters, such as Delta G degrees, Delta S degrees, and Delta H degrees, have been calculated. The thermodynamics of the trimethylxanthine -BK system indicated an endothermic process.
Açıklama
Anahtar Kelimeler
Activated carbon, Adsorption, Trimethylxanthine, Kinetics, Diffusion
Kaynak
Fresenius Environmental Bulletin
WoS Q Değeri
Q4
Scopus Q Değeri
Cilt
21
Sayı
4A
