Porous Spherical Cellulose Carrier Modified with Polyethyleneimine and Its Adsorption for Cr(Ⅲ) and Fe(Ⅲ) from Aqueous Solutions  

多孔聚乙烯亚胺-纤维素球对水中Cr(Ⅲ)和Fe(Ⅲ)的吸附性能研究(英文)

作　　者：何志坚 宋航 崔艳南 朱卫霞 杜开峰 姚舜 

机构地区：[1]School of Chemistry and Chemical Engineering,Mianyang Normal University [2]Department of Pharmaceutical and Biological Engineering,Sichuan University

出　　处：《Chinese Journal of Chemical Engineering》2014年第9期984-990,共7页中国化学工程学报（英文版）

基　　金：Supported by the National Natural Science Foundation of China(81373284,81102344);the Project of Education Department in Sichuan(14ZB0267);the Bureau of Science and Technology of Mianyang City of China(10Y003-8)

摘　　要：An efficient porous spherical polyethyleneimine-cellulose （PEI-cell） absorbent was synthesized and char- acterized. The main influencing factors and adsorption mechanism for two typical metal ions, Cr3＋ and Fe3＋, were investigated. The adsorption performance primarily depends on the initial concentration of metal ions, pH value and temperature, and the chelation action between N atoms of PEl-cell and metal ions plays an important role. Under dynamic adsorption conditions, the saturation adsorption of polyethyleneimine-cellulose is 83.98 mg.g-1 for Cr（Ⅲ） and 377.19 mg-g-1 for Fe（Ⅲ）, higher than report- ed data and that of unmodified cellulose. The adsorption can be well described with second-order kinetic equation and Freundlich adsorption model, and AH, AG and 5 of the adsorption are all negative. With 5% HCI as eluent, the elution ratio of Cr（Ill） and Fe（llI） achieved 99.88% and 97.74% at 313 K, respectively. After the porous PEI-cell was reused 6 times, it still presented satisfactory adsorption performance. Above results show the advantages such as easily-acquired raw material, high efficiency, stable recycling oerformance and biodegradability.An efficient porous spherical polyethyleneimine-cellulose(PEI-cell) absorbent was synthesized and characterized. The main influencing factors and adsorption mechanism for two typical metal ions, Cr3+and Fe3+, were investigated. The adsorption performance primarily depends on the initial concentration of metal ions, pH value and temperature, and the chelation action between N atoms of PEI-cell and metal ions plays an important role. Under dynamic adsorption conditions, the saturation adsorption of polyethyleneimine-cellulose is 83.98 mg·g-1for Cr(III) and 377.19 mg·g-1for Fe(III), higher than reported data and that of unmodified cellulose. The adsorption can be well described with second-order kinetic equation and Freundlich adsorption model, and ΔH, ΔG and ΔS of the adsorption are all negative. With 5%HCl as eluent, the elution ratio of Cr(III) and Fe(III) achieved 99.88% and 97.74% at 313 K, respectively.After the porous PEI-cell was reused 6 times, it still presented satisfactory adsorption performance.Above results show the advantages such as easily-acquired raw material, high efficiency, stable recycling performance and biodegradability.

关 键 词：PolyethyleneimineCellulose particleAdsorptionCr（Ⅲ）Fe（Ⅲ） 

分 类 号：O647.3[理学—物理化学]