刘流,田秀枝,蒋学,高文强,侯恩凤.L-赖氨酸接枝微/纳米纤维素的制备及其pH响应型染料吸附性能的研究[J].中国造纸学报,2026,41(1):88-96 本文二维码信息
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L-赖氨酸接枝微/纳米纤维素的制备及其pH响应型染料吸附性能的研究
Preparation of L-lysine Grafted Micro/Nano Cellulose and Study on Its pH Responsive Dye Adsorption Properties
投稿时间:2025-03-01  修订日期:2025-03-20
DOI:10.11981/j.issn.1000-6842.2026.01.88
中文关键词:  微/纳米纤维素  L-赖氨酸  pH响应  染料吸附
Key Words:micro/nano cellulose  L-lysine  pH responsiveness  dye adsorption
基金项目:陕西科技大学自然科学前沿研究基金(2020XSGG-07);陕西省重点研发计划(2022GY-278);陕西省自然科学基础研究计划(2023-JC-YB-104);广西清洁化制浆造纸与污染控制重点实验室开放基金(2023GXZZKF36)。
作者单位邮编
刘流* 1陕西科技大学轻工科学与工程学院,陕西西安,710021 710021
田秀枝 1陕西科技大学轻工科学与工程学院,陕西西安,710021
2广西大学广西清洁化制浆造纸与污染控制重点实验室,广西南宁,530004 
530004
蒋学* 1陕西科技大学轻工科学与工程学院,陕西西安,710021
2广西大学广西清洁化制浆造纸与污染控制重点实验室,广西南宁,530004 
530004
高文强 1陕西科技大学轻工科学与工程学院,陕西西安,710021 710021
侯恩凤 1陕西科技大学轻工科学与工程学院,陕西西安,710021 710021
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中文摘要:
      本研究通过多级改性策略,制备了pH响应型微/纳米纤维素吸附剂(Lys-g-MNC)。首先采用超微粉碎获得微/纳米纤维素(MNC,超过60%粒径达到纳米级),经高碘酸钠氧化得到微/纳米二醛纤维素(MNDAC),进而与L-赖氨酸发生席夫碱反应以引入两性基团,制得Lys-g-MNC。结果表明,Lys-g-MNC(约85%粒径为纳米级)具有两性特征(等电点为5.2)且含有大量无定形区。以活性蓝-19(RB-19)和亚甲基蓝(MB)为模型污染物,在pH值=3时,Lys-g-MNC对RB-19的理论饱和吸附量达144.3 mg/g,当pH值=10时,对MB的理论饱和吸附量达163.8 mg/g,展现出显著的pH响应特性;吸附过程符合拟二级动力学吸附模型和Langmuir等温吸附模型,表明其以单分子层化学吸附为主导机制。
Abstract:
      In this study, a pH-responsive micro/nano cellulose adsorbent (Lys-g-MNC) was prepared via a multi-stage modification strategy. Firstly, micro/nano cellulose (MNC,more than 60% of its particles were in the nanoscale range) was obtained by ultrafine grinding, and then oxidized with sodium periodate to produce micro/nano-dialdehyde cellulose (MNDAC). Subsequently, MNDAC was subjected to a Schiff base reaction with L-lysine to introduce amphoteric groups and prepare Lys-g-MNC. The results showed that Lys-g-MNC (approximately 85% of its particles were in the nanoscale range) exhibited amphoteric characteristics with an isoelectric point of 5.2 and contained a large number of amorphous regions. Using reactive blue 19 (RB-19) and methylene blue (MB) as model contaminants, the theoretical saturation adsorption capacity of Lys-g-MNC towards RB-19 reached 144.3 mg/g at pH value of 3, while its theoretical saturation adsorption capacity towards MB reached 163.8 mg/g at pH value of 10, indicating prominent pH-responsive properties. The adsorption process was well fitted with the pseudo-second-order kinetic and the Langmuir isothermal adsorption model, suggesting that the dominant mechanism was monolayer chemisorption.
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