高等学校化学学报 ›› 2024, Vol. 45 ›› Issue (9): 20240221.doi: 10.7503/cjcu20240221

• 研究论文: 无机化学 • 上一篇    

Beta@ZIF-67复合材料的制备及对聚乳酸塑料的催化降解性能

王晨竹1, 高明坤1, 高艳静1, 齐思贤1, 于吉红1,2()   

  1. 1.吉林大学化学学院, 无机合成与制备化学国家重点实验室
    2.未来科学国际合作联合实验室, 长春 130012
  • 收稿日期:2024-05-05 出版日期:2024-09-10 发布日期:2024-07-01
  • 通讯作者: 于吉红 E-mail:jihong@jlu.edu.cn
  • 作者简介:第一联系人:共同第一作者.
  • 基金资助:
    国家重点研发计划项目(2022YFA1503600)

Beta@ZIF-67 Composite for Catalytic Degradation of Polylactic Acid Plastics

WANG Chenzhu1, GAO Mingkun1, GAO Yanjing1, QI Sixian1, YU Jihong1,2()   

  1. 1.State Key Laboratory of Inorganic Synthesis and Preparative Chemistry,College of Chemistry
    2.International Center of Future Science,Jilin University,Changchun 130012,China
  • Received:2024-05-05 Online:2024-09-10 Published:2024-07-01
  • Contact: YU Jihong E-mail:jihong@jlu.edu.cn
  • Supported by:
    the National Key Research and Development Program of China(2022YFA1503600)

摘要:

以聚乳酸(PLA)为代表的可降解塑料被认为是传统石油基塑料的合适替代品. 然而, PLA自然降解的时间较长, 同时伴随着CO2的排放. 因此, 升级回收PLA更有利于实现可持续发展. 本文通过将沸石咪唑酯骨架(ZIF-67)生长在Beta沸石表面, 制备了一种Beta@ZIF-67复合材料. 该材料可以实现废弃PLA塑料的高效催化降解, 在180 ℃下反应4 h即可将日常生活中所用PLA塑料完全转化为乳酸甲酯(产率高达76.4%). 这种高催化效率得益于复合材料开放的孔道结构和较大的比表面积, 以及ZIF-67(Lewis酸/碱)与Beta分子筛(Brønsted酸)所提供活性位点的协同作用. 本研究为沸石分子筛复合催化剂的设计合成及用于聚乳酸塑料催化降解提供了新的途径.

关键词: Beta沸石, 沸石咪唑酯骨架, 聚乳酸, 催化降解

Abstract:

Biodegradable plastics, such as polylactic acid(PLA), are preferable to traditional petroleum-based plastics. However, the natural degradation of PLA takes a long time and releases CO2. Therefore, upcycling PLA is a better option for achieving sustainable development. In this study, a Beta@ZIF-67 composite was developed for efficient catalytic degradation of waste PLA plastics, which was achieved by growing the zeolitic imidazolate framework-67(ZIF-67) on the surface of Beta zeolite. As a result, the real-life PLA plastics were completely converted to methyl lactate in just 4 h at 180 ℃ with a yield up to 76.4%. The high catalytic efficiency was attributed to the composite's open pore structure, large specific surface area, and the synergistic effect of the active sites provided by ZIF-67(Lewis acid/base) and Beta zeolite(Brønsted acid). Overall, this study provides a new way for designing and synthesizing zeolite-based composite catalysts, which show promising applications in the catalytic degradation of plastics.

Key words: Beta zeolite, Zeolitic imidazolate framework, Polylactic acid, Catalytic degradation

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