Preparation of sawdust functionalized with aspartic acid and its sorption capacity,kinetics and thermodynamics for basic dyes |
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Authors: | Renmin Gong Na Li Shoujun Ni Pingzhen Guo Fenghong Huang |
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Affiliation: | (1) College of Life Science, Anhui Normal University, 241000 Wuhu, People’s Republic of China;(2) Department of Logistic and Industrial Administration, Anhui Normal University, 241000 Wuhu, People’s Republic of China |
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Abstract: | An ion exchanger with carboxyl groups as active sites was prepared by activating sawdust with epichlorohydrin, followed by
coupling the epoxy-activated sawdust with aspartic acid. The optimal sorption condition, sorption capacity, kinetics and thermodynamics
of basic dyes on sawdust ion exchanger (SIE) from aqueous solution were investigated in a batch system. Two basic dyes, methylene
blue (MB) and crystal violet (CV), were selected as sorbates. The optimal pH value of MB and CV solutions for favorable sorption
was pH 4 and above. The removal ratios of MB and CV on SIE increased with increasing sorbent dose but decreased with increasing
dye concentration. The isothermal data of MB and CV sorbed on SIE correlated basically with the Langmuir model. The maximum
sorption capacity (Q
m
) of SIE for MB and CV was 222.22 and 232.56 mg/g, respectively. The sorption equilibriums of MB and CV on SIE were reached
at about 9 h, and the sorption processes could be described by the pseudo-second-order kinetic model. The thermodynamic study
indicated that the sorptions of MB and CV on SIE were spontaneous and endothermic at the predetermined temperatures. High
temperatures were favorable for the sorption processes. |
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Keywords: | |
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