Adsorption of Cr(Ⅵ) from water by polyethyleneimine decorated magnetic carbon nano-tubes

doi:10.11894/1005-829x.2017.37(11).070

Abstract

Abstract: Magnetic multi-walled carbon nano-tubes(MWCNTs@Fe₃O₄) have been prepared by solvothermal method,and MWCNTs@Fe₃O₄/PEI obtained by surface-decorated polyethyleneimine(PEI). The adsorbent has been characterized,and the influences of pH,ionic intensity and natural organic matter on the adsorption of Cr(Ⅵ) from water,and the cyclic regeneration capability of adsorbents investigated. The results show that the optimum adsorption pH=3. The adsorption process complies with the pseudo-second order kinetic model and Langmuir isothermal adsorption model. The ionic intensity inhibits the adsorption of Cr(Ⅵ),but humic acid has little influence on the removal of Cr(Ⅵ). After six times of adsorption and analysis,the adsorbent still has pretty good adsorption performance.

Key words: multi-walled carbon nano-tubes(MWCNTs), magnetic, polyethyleneimine(PEI), Cr(Ⅵ), adsorption

摘要： 采用溶剂热法制备磁性多壁碳纳米管（MWCNTs@Fe₃O₄），用聚乙烯亚胺（PEI）进行表面修饰，得到MWCNTs@Fe₃O₄/PEI。对吸附剂进行表征，研究pH、离子强度和天然有机物对水中铬（Ⅵ）的吸附及吸附剂的循环再生能力。结果表明，最佳吸附pH=3，吸附过程符合准二级动力学模型和Langmuir等温吸附模型，离子强度抑制Cr（Ⅵ）的吸附；腐殖酸对Cr（Ⅵ）的吸附影响不大。在6次吸附解吸后，吸附剂仍有良好的吸附性能。

关键词: 多壁碳纳米管, 磁性, 聚乙烯亚胺, 铬(Ⅵ), 吸附

CLC Number:

X703

Yue Wenli, Zhao Hailiang, Pan Xuejun, Chen Bo. Adsorption of Cr(Ⅵ) from water by polyethyleneimine decorated magnetic carbon nano-tubes[J]. INDUSTRIAL WATER TREATMENT, 2017, 37(11): 70-74.

岳文丽, 赵海亮, 潘学军, 陈波. 聚乙烯亚胺修饰磁性碳纳米管对水中六价铬的吸附[J]. 工业水处理, 2017, 37(11): 70-74.

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URL: https://www.iwt.cn/EN/10.11894/1005-829x.2017.37(11).070

https://www.iwt.cn/EN/Y2017/V37/I11/70

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