Wang Xiaoqiang, Li Jie, Liu Zhiyuan, Wang Chao, Yu Daoyong, Ge Baosheng, Huang Fang
State Key Laboratory of Heavy Oil Processing & College of Chemistry and Chemical Engineering, China University of Petroleum (East China), 66 West Changjiang Road, Qingdao, Shandong 266580, China.
State Key Laboratory of Heavy Oil Processing & College of Chemistry and Chemical Engineering, China University of Petroleum (East China), 66 West Changjiang Road, Qingdao, Shandong 266580, China.
Int J Biol Macromol. 2025 Jun;315(Pt 1):144442. doi: 10.1016/j.ijbiomac.2025.144442. Epub 2025 May 22.
Zeolitic imidazolate framework-8 (ZIF-8) developed as carbonic anhydrase mimics for CO capture currently suffers from insufficient catalytic activity, stability and recyclability. In this work, metal-doped ZIF-8 with Co or Ni was immobilized on delignified bamboo cellulose scaffolds (DBS) via in situ mineralization to create recyclable efficient biomimetic catalysts. The successful synthesis of DBS-supported ZIF-8 was confirmed through scanning electron microscopy, energy dispersive spectroscopy, X-ray diffraction, and infrared spectroscopy, with metal doping ratios optimized to Co/Zn (3:2) and Ni/Zn (1:1) for maximum activity. Ni/ZIF 8@DBS composite exhibited superior activity and CO2 hydration rates, surpassing free Ni/ZIF-8 and Co/ZIF-8@DBS. In addition, DBS immobilization enhanced stability, retaining ∼60 % activity under alkaline conditions after 12 h and ∼50 % under continuous flow for 24 h. Overall, Ni/Co doping and DBS immobilization improved ZIF-8 catalytic efficiency, stability and recyclability, demonstrating promising potential for industrial CO capture through catalytic hydration.
作为用于捕获二氧化碳的碳酸酐酶模拟物而开发的沸石咪唑酯骨架-8（ZIF-8）目前存在催化活性、稳定性和可回收性不足的问题。在这项工作中，通过原位矿化将含有钴或镍的金属掺杂ZIF-8固定在脱木质素竹纤维素支架（DBS）上，以制备可回收的高效仿生催化剂。通过扫描电子显微镜（SEM）、能谱（EDS）、X射线衍射（XRD）和红外光谱（FT-IR）证实了DBS负载的ZIF-8的成功合成，并将金属掺杂比例优化为Co/Zn（3:2）和Ni/Zn（1:1）以实现最大活性。Ni/ZIF 8@DBS复合材料表现出优异的活性和二氧化碳水合速率，超过了游离的Ni/ZIF-8和Co/ZIF-8@DBS。此外，DBS固定化提高了稳定性，在碱性条件下12小时后保留约60%的活性，在连续流动24小时后保留约50%的活性。总体而言，镍/钴掺杂和DBS固定化提高了ZIF-8的催化效率、稳定性和可回收性，显示出通过催化水合作用进行工业二氧化碳捕获的广阔前景。
