TY - JOUR
T1 - Chemical modification of Amberlite XAD-4 by carbonyl groups for phenol adsorption from wastewater
AU - Li, Chengyong
AU - Xu, Maowen
AU - Sun, Xiucheng
AU - Han, Shan
AU - Wu, Xiaofei
AU - Liu, You Nian
AU - Huang, Jianhan
AU - Deng, Shuguang
N1 - Funding Information:
We are greatly appreciated for the National Natural Science Foundation of China (No. 21174163), the freedom explore Program of Central South University (No. 2282013bks127), and the Shenghua Yuying Project of Central South University for providing financial supports to this research project. Appendix A
PY - 2013/8/1
Y1 - 2013/8/1
N2 - Two carbonyl groups modified XAD-4 resins (XAD-4-I and XAD-4-II) were synthesized by chemically modifying Amberlite XAD-4 with carbon tetrachloride and benzoyl chloride according to the Friedel-Crafts reaction. After the chemical modification, the Brunauer-Emmet-Teller (BET) surface area and pore volume of the resins increased about 50% while their median pore size remained constant. More importantly, the modified resins adsorbed about 20% more phenol from aqueous solutions than the original XAD-4 at 298, 308 and 318. K, respectively; and the modified resins could be used directly in water without pre-wetting. The Freundlich and Sips models fitted the isotherm data better than the Langmuir model. Analysis of isosteric adsorption enthalpy indicated that XAD-4 has a more heterogeneous surface than the modified resins. Adsorption kinetics data suggested that the three resins could reach equilibrium within 1. h, and the pseudo-first-order and pseudo-second-order rate models could describe the kinetic data effectively. At a phenol feed concentration of 574.0. mg/L, the dynamic adsorption capacities of XAD-4, XAD-4-I and XAD-4-II were measured to be 80.6, 94.8 and 93.6. mg/g, respectively. Desorption experiments showed that the used resins could be regenerated completely by a 50% (v/v) ethanol aqueous solution.
AB - Two carbonyl groups modified XAD-4 resins (XAD-4-I and XAD-4-II) were synthesized by chemically modifying Amberlite XAD-4 with carbon tetrachloride and benzoyl chloride according to the Friedel-Crafts reaction. After the chemical modification, the Brunauer-Emmet-Teller (BET) surface area and pore volume of the resins increased about 50% while their median pore size remained constant. More importantly, the modified resins adsorbed about 20% more phenol from aqueous solutions than the original XAD-4 at 298, 308 and 318. K, respectively; and the modified resins could be used directly in water without pre-wetting. The Freundlich and Sips models fitted the isotherm data better than the Langmuir model. Analysis of isosteric adsorption enthalpy indicated that XAD-4 has a more heterogeneous surface than the modified resins. Adsorption kinetics data suggested that the three resins could reach equilibrium within 1. h, and the pseudo-first-order and pseudo-second-order rate models could describe the kinetic data effectively. At a phenol feed concentration of 574.0. mg/L, the dynamic adsorption capacities of XAD-4, XAD-4-I and XAD-4-II were measured to be 80.6, 94.8 and 93.6. mg/g, respectively. Desorption experiments showed that the used resins could be regenerated completely by a 50% (v/v) ethanol aqueous solution.
KW - Adsorption
KW - Amberlite XAD-4 resin
KW - Characterization
KW - Chemical modification
KW - Phenol
UR - http://www.scopus.com/inward/record.url?scp=84879590804&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84879590804&partnerID=8YFLogxK
U2 - 10.1016/j.cej.2013.05.090
DO - 10.1016/j.cej.2013.05.090
M3 - Article
AN - SCOPUS:84879590804
SN - 1385-8947
VL - 229
SP - 20
EP - 26
JO - Chemical Engineering Journal
JF - Chemical Engineering Journal
ER -