| 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 |
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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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