Open AccessAdsorption Study for Chromium (VI) on Iraqi Bentonite
Author(s) -
Khulood Abid Saleh Al-Saadie,
Sara Badrie Jassim
Publication year - 2010
Publication title -
mağallaẗ baġdād li-l-ʿulūm
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.167
H-Index - 6
eISSN - 2411-7986
pISSN - 2078-8665
DOI - 10.21123/bsj.7.1.745-756
Subject(s) - adsorption , freundlich equation , bentonite , hexavalent chromium , sorption , chemistry , chromium , aqueous solution , langmuir , nuclear chemistry , thermodynamics , chemical engineering , organic chemistry , physics , engineering
The subject of this research involves studying adsorption to remove hexavalent chromium Cr(VI) from aqueous solutions.Adsorption process on bentonite clay as adsorbent was used in the Cr(VI) concentration range (10-100) ppm at different temperatures (298, 303, 308 and 313)K, for different periods of time.The adsorption isotherms were obtained by obeying Langmuir and Freundlich adsorption isotherm with R2 (0.9921-0.9060) and (0.994-0.9998), respectively.The thermodynamic parameters were calculated by using the adsorption process at four different temperatures the values of ?H, ?G and ?S was [(+6.582 ? +6.547) kJ.mol-1, (-284.560 ? -343.070) kJ.mol-1 and (+0.977 ? +1.117) kJ.K-1.mol-1] respectively. This data indicates the spontaneous sorption process. The kinetic study of adsorption process was studied depending on three kinetic equations:1- Lagergren equation2- Morris-Weber equation3- Reichenberg equation