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Synthesis of Amino-protected Chitosan by Tripolyphosphate and Epichlorohydrin Modification: Cr(VI) Adsorption and Reaction Mechanism

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Abstract

Chitosan has shown high application potential in the adsorptive removal of pollutants, but due to its weak mechanical strength and acid resistance, it is limited in practical water treatment applications. To address this issue, cross-linking has been widely used to enhance the stability of chitosan, but these methods inevitably consume the effective functional groups of chitosan and reduce its adsorption performance. In this study, the epichlorohydrin modified chitosan protected by sodium tripolyphosphate (ECS) was synthesized for removing Cr(VI). The synthesized adsorbent exhibited good adsorption performance for Cr(VI), the maximum adsorption capacity of the synthetic composite for Cr(VI) was 144.55 mg/g, which is consistent with the Langmuir model calculated date (145.18 mg/g). Effect of pH value, temperature, and time were discussed, which indicated that pseudo-first-order kinetic and Langmuir isotherm models can provide better agreement with experimental data. Characterization results indicated that the removal mechanism of Cr(VI) by ECS was a synergistic effect of electrostatic adsorption and electron reduction.

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The data will be available upon request from the corresponding author.

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Funding

The authors acknowledge the financial support from the National Natural Science Foundation of China [grant number 51904004], Outstanding Youth Scientific Research Project of Colleges and Universities in Anhui Province [grant number 2022AH030044], and Open Project of Engineering Research Center of Biofilm Water Purification and Utilization Technology of Ministry of Education [grant number BWPU2021KF10].

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Authors and Affiliations

  1. Engineering Research Center of Biofilm Water Purification and Utilization Technology of Ministry of Education, Anhui University of Technology, Maanshan, 243032, Anhui, China

    Shenghao Zhang, Lili Xin, Mingyang Li, Hongming Long & Xiangpeng Gao

  2. School of Metallurgical Engineering, Anhui University of Technology, Maanshan, 243032, Anhui, China

    Shenghao Zhang, Lili Xin, Mingyang Li, Hongming Long & Xiangpeng Gao

  3. Advanced Institute of Natural Sciences, Beijing Normal University at Zhuhai, Zhuhai, 519087, Guangdong, China

    Shenghao Zhang & Fuqiang Fan

  4. Jiangsu Suxun New Materials Technology Co., Ltd, Suqian, 223699, Jiangsu, China

    Xiangpeng Gao

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Contributions

SZ: Methodology, Formal analysis, Validation, Writing—Original draft preparation. LX: Validation, Investigation, Writing—Original draft preparation, Supervision. ML: Conceptualization, Writing—Reviewing and Editing. FF: Supervision, Writing—Reviewing and Editing. HL: Methodology, Formal analysis. XG: Conceptualization, Methodology, Supervision, Funding acquisition.

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Correspondence to Lili Xin or Xiangpeng Gao.

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Zhang, S., Xin, L., Li, M. et al. Synthesis of Amino-protected Chitosan by Tripolyphosphate and Epichlorohydrin Modification: Cr(VI) Adsorption and Reaction Mechanism. J Polym Environ 32, 703–717 (2024). https://doi.org/10.1007/s10924-023-03005-7

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