纤维素基载银水凝胶对亚甲基蓝的催化还原性能
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Catalytic reduction of methylene blue using cellulose-based silver-loaded hydrogels
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    摘要:

    针对银纳米颗粒(Ag NPs)催化剂在亚甲基蓝(methylene blue,MB)催化还原反应中高催化性与易回收性难以平衡的问题,制备了纤维素基载银水凝胶(TOC-CMC-Ag),对MB的催化还原性能进行研究。首先,以氧化纤维素(oxidized cellulose,TOC)和羧甲基纤维素(carboymethyl cellulose,CMC)为原料,环氧氯丙烷(epichlorohydrin,ECH)为交联剂,制备TOC-CMC水凝胶,研究CMC取代度对溶胀、吸附性能的影响;然后,以吸附性能最好的TOC-CMC水凝胶为载体,通过原位还原法制备TOC-CMC-Ag,并进行透射电镜和X射线光电子能谱表征;最后,研究TOC-CMC-Ag对MB的催化还原性能。结果表明,TOC-CMC-Ag能在4 min内完全还原MB,且在7次循环使用后仍可使MB得到完全还原。所制备的兼具高催化性与易回收性的载银水凝胶,为开发综合性能优异的催化还原催化剂提供了新途径。

    Abstract:

    In view of the problem that it is difficult to balance the high catalytic activity and easy recovery of silver nanoparticles(Ag NPs)catalyst in the catalytic reduction of methylene blue (MB), a cellulose-based silver-loaded hydrogel(TOC-CMC-Ag) was prepared and its catalytic reduction performance to MB was studied. Firstly, TOC-CMC hydrogels were prepared with oxidized cellulose (TOC) and carboxymethyl cellulose (CMC) as raw materials and epichlorohydrin(ECH) as cross-linking agent. The effect of CMC substitution degree on their swelling and adsorption properties was studied. Then, TOC-CMC-Ag was prepared by in-situ reduction method using the TOC-CMC hydrogel with the best adsorption performance as the carrier. The production was characterized by transmission electron microscopy and X-ray photoelectron spectroscopy. Finally, the catalytic reduction performance of TOC-CMC-Ag on MB was studied. The results indicate that TOC-CMC-Ag can completely reduce MB within 4 minutes. After 7 catalytic cycles, MB could still be completely reduced. The prepared silver-loaded hydrogel with high catalytic activity and easy recovery provides a new way for the development of catalytic reduction catalyst with excellent comprehensive performance.

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高凯茹,张欣瑶,崔茂祺,袁 淼,刘少杰.纤维素基载银水凝胶对亚甲基蓝的催化还原性能[J].河北科技大学学报,2025,46(3):268-275

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  • 收稿日期:2024-10-31
  • 最后修改日期:2024-12-26
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  • 在线发布日期: 2025-07-02
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