Chinese Journal of Applied Chemistry ›› 2022, Vol. 39 ›› Issue (11): 1735-1745.DOI: 10.19894/j.issn.1000-0518.220043

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Zeolitic Imidazolate Framework ZIF‑71 for Adsorption and Separation of 2,3‑Butanediol/1,3‑Propanediol From Dilute Aqueous Solutions

Jian-Shuang ZHANG, Mei-Zhen GAO, Meng-Yao WANG, Qi SHI(), Jin-Xiang DONG   

  1. Taiyuan University of Technology,Taiyuan 030024,China
  • Received:2022-02-21 Accepted:2022-05-19 Published:2022-11-01 Online:2022-11-09
  • Contact: Qi SHI
  • About author:shiqi594@163.com
  • Supported by:
    the National Natural Science Foundation of China(21822808)

Abstract:

1,3-Propanediol is an important chemical material, and the production of 1,3-propanediol by biological fermentation often produces 2,3-butanediol, which limits the further industrial application of bio-based 1,3-propanediol. 1,3-Propanediol and 2,3-butanediol have strong hydrophilicity, which makes it difficult to separate in low-concentration fermentation broth. ZIF-71 containing group —Cl (hydrophobicity and large polarizability) is selected to adsorb and separate 2,3-butanediol/1,3-propanediol from dilute aqueous solutions since 2,3-butanediol has a longer carbon chain and larger polarizability than 1,3-propanediol. The results show that the binary competitive adsorption capacity of ZIF-71 for 2,3-butanediol is 123.6 mg/g, the binary competitive separation selectivity for 2,3-butanediol/1,3-propanediol is up 7.6 and is better than Beta. In the three-cycle adsorption and desorption experiments, ZIF-71 still maintains a stable structure and selective adsorption for 2,3-butanediol. We reveal the separation mechanism of ZIF-71 for 1,3-propanediol and 2,3-butanediol through molecular simulation. The interaction between ZIF-71 and 1,3-propanediol is mainly through weak van der Waals force; while the interaction between ZIF-71 and 2,3-butanediol is through the synergistic effect of strong van der Waals force and weak hydrogen bonding, which causes the selective adsorption of 2,3-butanediol by ZIF-71. Therefore, ZIFs materials are expected to be candidate adsorbents for the selective adsorption and separation of by-product 2,3-butanediol from dilute aqueous solutions, which promotes the industrialization of biological production of 1,3-propanediol.

Key words: Zeolitic imidazolate frameworks, ZIF-71, Adsorption separation, 1, 3-Propanediol, 2, 3-Butanediol

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