Chitin/polyethyleneimine composite as an adsorbent of aqueous Cr (Ⅵ)

doi:10.11949/j.issn.0438-1157.20171276

Abstract

Abstract:

The polyethyleneimine (PEI) was homogeneously grafted onto the chitin (CT) with aid of epichlorohydrin to produce CT-based biosorbents (CTP) for removal of Cr(Ⅵ) from water. The structure and morphology of CTP were characterized by FT-IR, XRD, SEM, EDS and Zeta potential. The effects of pH value, contact time, initial Cr(Ⅵ) concentration, treatment temperature and coexisting ions on the Cr(Ⅵ) adsorption were investigated. The results showed that the CTP with a mass ratio of PEI:CT=4:1 (CTP₄) presented a maximum adsorption capacity of 330.4 mg·g^-1 according to the Langmuir isotherm at 25℃ and pH value 2.0. The adsorption was a spontaneous and endothermal process, which achieved the equilibrium within 60 min and followed the pseudo-second-order kinetic model. After six cycles of adsorption-desorption, the CTP₄ remained 89.5% of its original adsorption capacity, suggesting its favorable reusability.

Key words: chitin, polyethyleneimine, homogeneous modification, adsorbent, waste water, Cr (Ⅵ), adsorption

摘要：

均相条件下，通过环氧氯丙烷将聚乙烯亚胺（PEI）接枝于甲壳素（CT）分子上，制备CT基Cr （Ⅵ）生物吸附剂（CTP）。采用FT-IR、XRD、SEM、EDS和Zeta电位表征CTP的结构与形貌。考察了溶液的pH、吸附时间、Cr （Ⅵ）的初始浓度、处理温度和共存离子对吸附的影响。结果表明，PEI与CT质量比为4：1的条件下所制备的CTP₄，在pH为2.0和温度为25℃的条件下，根据Langmuir模型计算的最大吸附量为330.4 mg·g^–1；吸附过程经过约60 min达到平衡，符合准二级动力学模型，是一个自发、吸热的过程；CTP₄可重复使用，经过6次吸附-解吸循环后，其吸附量保持初次吸附量的89.5%。

关键词: 甲壳素, 聚乙烯亚胺, 均相改性, 吸附剂, 废水, Cr (Ⅵ), 吸附作用

CLC Number:

TQ085
O636.9

LIANG Xingtang, ZHONG Shuming, LIU Zijie, ZHENG Yunying, ZHANG Ruirui, JIAO Shufei, LIAO Riquan, WANG Yun, YIN Yanzhen. Chitin/polyethyleneimine composite as an adsorbent of aqueous Cr (Ⅵ)[J]. CIESC Journal, 2018, 69(5): 2255-2262.

梁兴唐, 钟书明, 刘子杰, 郑韵英, 张瑞瑞, 焦淑菲, 廖日权, 王芸, 尹艳镇. 甲壳素/聚乙烯亚胺复合物对水溶液中Cr(Ⅵ)的吸附[J]. 化工学报, 2018, 69(5): 2255-2262.

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