聚多巴胺改性双醛壳聚糖的制备及其吸附性能
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安徽农业大学轻纺工程与艺术学院

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X703

基金项目:

科技部“科技助力经济2020”重点专项项目(国科发资〔2020〕151号) ; 安徽省科技重大专项项目(202103a06020005)


Preparation and adsorption properties of polyamine modified dialdehyde chitosan
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1.Anhui Agricultural University;2.Anhui 3.Agricultural 4.University;5.Anhui&6.amp;7.#160;8.Agricultural&

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Key special project of the Ministry of science and technology "science and technology help the economy 2020" (gkfz [2020] No. 151) ;Major special projects of science and technology in Anhui Province (202103a06020005)

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    摘要:

    以壳聚糖(CS)为基材,采用高碘酸钠选择性氧化制备了双醛壳聚糖(DCS),再通过接枝聚多巴胺(PDA)制得环保型聚多巴胺/双醛壳聚糖(PDA/DCS)。采用SEM、FTIR等对两种改性壳聚糖的微观形貌和化学结构进行表征,并对胭脂红的吸附性能进行测试。结果表明,CS被高碘酸钠氧化后引入活性基团醛基,可与PDA产生共价结合,选择性氧化有效提高了DCS和PDA/DCS的吸附效果;与原CS相比,DCS结晶度明显下降,孔隙率和比表面积提高;而PDA/DCS呈现较密集的多孔结构。DCS和PDA/DCS的吸附过程均遵循准二级动力学模型和Langmuir等温模型;但与DCS相比,PDA/DCS的吸附速率及容量明显提升,当染料初始质量浓度为700 mg/L时,PDA/DCS最大单分子层吸附量可达到1194.4 mg/g,且经过5次循环使用后,其吸附量仍达到616.90 mg/g。

    Abstract:

    In this work, an environmentally friendly polydopamine-modified dialdehyde chitosan (PDA/DCS) was synthesized by the polydopamine (PDA) grafted with dialdehyde chitosan (DCS). The DCS was prepared via sodium periodate selective oxidation of the chitosan (CS). In order to characterize the micro morphology and chemical structure of the modified chitosan, SEM, FTIR, and other tests were performed. The adsorption abilities were studied using the carmine as a model pollutants. As the results revealed, the CS molecular was produce the covalent binding with PDA due to the formation of the aldehyde group by sodium periodate oxidation reaction. A key factor in the improved adsorption abilities of DCS and PDA/DCS was the selective oxidation treatment. Compared with the pristine CS, the crystallinity of DCS dropped sharply, while the porosity and specific surface area were increased. In addition, the microstructure of PDA/DCS presents a dense porous structure. The adsorption processes of DCS and PDA/DCS both followed the quasi-second-order kinetic equation and Langmuir isothermal model. Moreover, the adsorption rate and capacity of PDA/DCS were significantly enhanced in comparison to the DCS. When the initial mass concentration of dye is 700 mg/L, the maximum monolayer adsorption capacity of PDA/DCS was 1194.4 mg/g. Even after the fifth recycling, the synthetic adsorbent can still reach 616.90 mg/g adsorption capacity.

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金海军,陈泽世,李丽丽,杨文菊,唐雨霞,王浩.聚多巴胺改性双醛壳聚糖的制备及其吸附性能[J].精细化工,2023,40(2):

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历史
  • 收稿日期:2022-07-08
  • 最后修改日期:2022-09-21
  • 录用日期:2022-09-21
  • 在线发布日期: 2023-01-17
  • 出版日期: 2022-09-30