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为有效提升聚丙烯酸(PAA)Fenton催化纤维的力学性能、活性铁物种自握持特性以及Fe3+自还原能力，利用硅烷偶联剂对纤维素纳米晶(CNC)进行改性，以优化CNC的分散性，随后制备分散有CNC的PAA纺丝溶液，采用湿法纺丝技术制备硅烷改性CNC掺杂PAA基Fenton催化纤维；探究硅烷偶联剂用量与种类对改性CNC掺杂PAA纤维力学性能和催化活性的影响，同时研究KH560改性CNC在改善PAA纤维活性铁物种自握持特性以及Fe3+自还原能力方面的作用。结果表明：当改性体系中硅烷偶联剂用量为0.070 mol时，纤维拥有最佳的力学性能；与其他硅烷偶联剂相比，KH560改性CNC掺杂PAA纤维具有更突出的力学性能，其抗拉强度达107.3 MPa，与未改性CNC掺杂PAA纤维相比提高了105.6%;KH560改性CNC可协助PAA锚定铁离子，致使KH560改性CNC掺杂纤维M2-P的平均铁离子浸出质量浓度仅为0.74 mg/L，不足PAA纤维的6.0%;KH560改性CNC还可作为还原剂促进Fe3+的还原，使M2-P中Fe2+、Fe3+的原子数目比达69.7/30.3，远高于PAA纤维的13.5/86.5,Fe2+含量高以及铁离子滤出低的特性使KH560改性CNC掺杂纤维M2-P循环使用42次脱色90%以上MB时所需总时间仅为270 min，远低于其他纤维，体现出优异的催化活性。
Abstract：To enhance the mechanical properties, retention of active iron species, and Fe3+ self-reduction capability of polyacrylic acid(PAA)-based Fenton catalytic fibers, cellulose nanocrystals(CNCs) were modified with a silane coupling agent to improve their dispersion. A PAA spinning solution containing the modified CNCs was then prepared. Silane-modified CNC-reinforced PAA-based Fenton catalytic fibers were fabricated via wet spinning. The effects of silane coupling agent type and dosage on the mechanical properties and catalytic activity of the modified CNC-reinforced PAA fibers were investigated. Additionally, the role of KH560-modified CNC in enhancing iron species retention and Fe3+ self-reduction within the fibers was examined. The results indicated that the optimal mechanical properties were achieved when 0.070 mol of silane coupling agent was used during the modification process. Among the silane coupling agents tested, KH560-modified CNC-reinforced PAA fibers exhibited the best mechanical performance, with a tensile strength of 107.3 MPa—an increase of 105.6% compared to unmodified CNC-reinforced PAA fibers. KH560-modified CNC facilitated the immobilization of iron ions within the PAA matrix, leading to a low average Fe leaching concentration of 0.74 mg/L in the M2-P fiber—less than 6.0% of that observed in pristine PAA fibers. Additionally, KH560-modified CNC acted as a reducing agent, converting Fe2+ to Fe3+. As a result, the Fe2+/Fe3+atomic ratio in the M2-P fiber reached 69.7/30.3, significantly higher than 13.5/86.5 observed in pristine PAA fibers. The high Fe2+ content and low leaching of iron ions enable the KH560-modified CNC-doped fiber M2-P to achieve over 90% methylene blue(MB)decolorization after 42 reuse cycles,with a total required time of only 270 min—significantly shorter than that of other fibers—demonstrating its excellent catalytic activity.
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基本信息:
中图分类号:X703;O643.36;TQ340.64
引用信息:
[1]徐乃库,张佳涵.硅烷改性CNC掺杂聚丙烯酸Fenton催化纤维的制备及其性能[J].天津工业大学学报,2025,44(06):9-14.
基金信息:
国家自然科学基金项目（51103099）
2025-10-20
2025-10-20
2025-10-20