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《Materials Review》 2012-02
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Preparation and Characterization of EGDE-crosslinked and La-incorporated Chitosan Beads for Defluoridation from Water

LI Yongfu,MENG Fanping,DU Xiuping(Key Laboratory of Environment Science and Ecology of Ministry of Education,Ocean University of China,Qingdao 266100)  
A new absorbent to remove fluoride from drinking water was studied using lanthanum incorporated chitosan beads which had been cross-linked with ethylene glycol diglycidyl ether(EGDE) previously substituted of glutaraldehyde(GLA).The results of orthogonal experiment show that the fluoride removal efficiency of absorbent(CEB-La) is mostly effected by the cross-linking temperature.The synthesis conditions of CEB-La are optimized as follows: chitosan beads are cross-linked with EGDE for 4 hours under the temperature of 20℃ and the molar ratio of EGDE and amino is 1∶2;the chelating time is 3 hours under the temperature of 40℃ and the dose of cross-linked chitosan beads(CEB) is 2g/L.Treated the water containing F-of 20mg/L using CEB-La prepared under these conditions,the residual concentration of F-was 0.79mg/L,lower than 1.0mg/L.These absorbents had good stability.The beads were characterized using FT-IR and XRD.The FT-IR spectra indicated that after EGDE reacted with amino and primary hydroxyl groups in chitosan,lanthanum coordinated with second hydroxyl group in CEB.The XRD spectra showed the crystallinity of CEB and CEB-La decreased distinctly which benefits the loading of lanthanum on CEB and fluoride adsorbing to CEB-La.Phase identifying for inorganic component of CEB-La revealed that lanthanum oxi-de was the main form of lanthanum.
【CateGory Index】: O636.1
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