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

LIANG Xingtang; ZHONG Shuming; LIU Zijie; ZHENG Yunying; ZHANG Ruirui; JIAO Shufei; LIAO Riquan; WANG Yun; YIN Yanzhen

doi:10.11949/j.issn.0438-1157.20171276

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

更新时间：2025-12-10

- Chitin/polyethyleneimine composite as an adsorbent of aqueous Cr (Ⅵ)
- CIESC Journal Issue 5, Pages: 2255-2262(2018)
- 作者机构：
  
  钦州学院石油与化工学院, 钦州市生物废弃物资源富硒功能化利用重点实验室,广西,钦州,535000
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20171276
  CLC： Q085O636.9
- Online First：05 May 2018，
  
  Published：05 May 2018
- 稿件说明：
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LIANG Xingtang, ZHONG Shuming, LIU Zijie, et al. Chitin/polyethyleneimine composite as an adsorbent of aqueous Cr (Ⅵ)[J]. CIESC Journal, 2018, (5): 2255-2262.
DOI：

LIANG Xingtang, ZHONG Shuming, LIU Zijie, et al. Chitin/polyethyleneimine composite as an adsorbent of aqueous Cr (Ⅵ)[J]. CIESC Journal, 2018, (5): 2255-2262. DOI： 10.11949/j.issn.0438-1157.20171276.

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%。

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.

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