TY - JOUR
T1 - Adsorption characteristics of natural zeolites as solid adsorbents for phenol removal from aqueous solutions
T2 - Kinetics, mechanism, and thermodynamics studies
AU - Yousef, Rushdi I.
AU - El-Eswed, Bassam
AU - Al-Muhtaseb, Ala'a H.
PY - 2011/7/15
Y1 - 2011/7/15
N2 - Zeolitic tuff was used for the adsorption of phenol from aqueous solutions at different temperatures in a batch process. The adsorption characteristics, i.e., kinetics, mechanism, isotherms, and thermodynamics, of phenol from water onto zeolite were studied. Three different kinetic models, viz., pseudo-first-order, pseudo-second-order, and intraparticle diffusion were used to fit the kinetics data. The pseudo-second-order model best described the experimental data. Concerning the mechanism, the results indicated that the intraparticle diffusion is not the rate limiting step in the phenol adsorption process. The adsorption isotherms at different temperatures were determined and modeled using four different models. The best-fitted adsorption isotherm models were found to be in the order: Freundlich > Redlich-Peterson > Langmiur > Temkin for temperature range 25-45 °C. The Langmiur model fitted well the experimental data with a maximum adsorption capacity of 34.5, 24.9, 23.8, and 23.3. mg/g at 25, 35, 45, and 55 °C. Thermodynamically, it was determined that the adsorption of phenol onto zeolite is physical in nature and enthalpy driven with Δ H° = -10.2. kJ/mol.
AB - Zeolitic tuff was used for the adsorption of phenol from aqueous solutions at different temperatures in a batch process. The adsorption characteristics, i.e., kinetics, mechanism, isotherms, and thermodynamics, of phenol from water onto zeolite were studied. Three different kinetic models, viz., pseudo-first-order, pseudo-second-order, and intraparticle diffusion were used to fit the kinetics data. The pseudo-second-order model best described the experimental data. Concerning the mechanism, the results indicated that the intraparticle diffusion is not the rate limiting step in the phenol adsorption process. The adsorption isotherms at different temperatures were determined and modeled using four different models. The best-fitted adsorption isotherm models were found to be in the order: Freundlich > Redlich-Peterson > Langmiur > Temkin for temperature range 25-45 °C. The Langmiur model fitted well the experimental data with a maximum adsorption capacity of 34.5, 24.9, 23.8, and 23.3. mg/g at 25, 35, 45, and 55 °C. Thermodynamically, it was determined that the adsorption of phenol onto zeolite is physical in nature and enthalpy driven with Δ H° = -10.2. kJ/mol.
KW - Adsorption
KW - Adsorption isotherms
KW - Adsorption kinetics
KW - Adsorption thermodynamics
KW - Phenol
KW - Zeolitic tuff
UR - http://www.scopus.com/inward/record.url?scp=79960186696&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=79960186696&partnerID=8YFLogxK
U2 - 10.1016/j.cej.2011.05.012
DO - 10.1016/j.cej.2011.05.012
M3 - Article
AN - SCOPUS:79960186696
SN - 1385-8947
VL - 171
SP - 1143
EP - 1149
JO - Chemical Engineering Journal
JF - Chemical Engineering Journal
IS - 3
ER -