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| Preparation of L-lysine Grafted Micro/Nano Cellulose and Study on Its pH Responsive Dye Adsorption Properties |
| Received:March 01, 2025 Revised:March 20, 2025 |
| DOI：10.11981/j.issn.1000-6842.2026.01.88 |
| Key Words:micro/nano cellulose;L-lysine;pH responsiveness;dye adsorption |
| Fund Project: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）。 |
| Author Name | Affiliation | Postcode | | LIU Liu* | 1College of Bioresources Chemical and Materials Engineering， Shaanxi University of Science & Technology， Xi’an， Shaanxi Province， 710021 | 710021 | | TIAN Xiuzhi | 1College of Bioresources Chemical and Materials Engineering， Shaanxi University of Science & Technology， Xi’an， Shaanxi Province， 710021
2Guangxi Key Lab of Clean Pulp & Papermaking and Pollution Control， Guangxi University， Nanning， Guangxi Zhuang Autonomous Region， 530004 | 530004 | | JIANG Xue* | 1College of Bioresources Chemical and Materials Engineering， Shaanxi University of Science & Technology， Xi’an， Shaanxi Province， 710021
2Guangxi Key Lab of Clean Pulp & Papermaking and Pollution Control， Guangxi University， Nanning， Guangxi Zhuang Autonomous Region， 530004 | 530004 | | GAO Wenqiang | 1College of Bioresources Chemical and Materials Engineering， Shaanxi University of Science & Technology， Xi’an， Shaanxi Province， 710021 | 710021 | | HOU Enfeng | 1College of Bioresources Chemical and Materials Engineering， Shaanxi University of Science & Technology， Xi’an， Shaanxi Province， 710021 | 710021 |
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| 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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