Regeneration of modified bentonite loaded with phenol using supercritical fluids


Salgin U., Yildiz N., Calimli A.

ADSORPTION SCIENCE & TECHNOLOGY, cilt.22, ss.39-50, 2004 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 22 Konu: 1
  • Basım Tarihi: 2004
  • Doi Numarası: 10.1260/026361704323150980
  • Dergi Adı: ADSORPTION SCIENCE & TECHNOLOGY
  • Sayfa Sayıları: ss.39-50

Özet

The desorption of phenol from organically modified bentonite (ODTMA-bentonite) using supercritical fluids was studied. Parameters such as pressure, temperature, supercritical fluid flow rate and co-solvent (entrainer) concentration were investigated. The maximum desorption of phenol (ca. 98 w/w%) using supercritical CO2 (SC CO,) was obtained by operating at 500 bar, 353 K and 3.33 x 10(-8) m(3) SC CO2/s. In the presence of ethanol as a co-solvent (10 v/v%), the maximum desorption of phenol attained a value of 97 w/w% using supercritical CO, at low temperature (313 K) and pressure (300 bar) and a high supercritical fluid flow rate (3.33 x 10(-8) m(3) SC CO2/s). In addition, the results showed that the regenerated ODTMA-bentonite retained its adsorption power towards phenol even after several regeneration cycles. It was therefore concluded that exhausted/used organobentonites might be regenerated via processes involving supercritical fluid extraction.