南开大学卜显和研究小组报道了柔性氢键有机框架内的烟气脱硫和SO2回收。该研究于2025年2月26日发表于国际一流学术期刊《自然-化学》杂志上。

在这里，该研究组报告了一种灵活的氢键有机框架（HOF-NKU-1），它可以通过材料的客体自适应响应和形状记忆效应来筛选SO₂。在环境条件下孔隙空间内，HOF-NKU-1对SO₂/CO₂的分离选择性为7331，SO₂的储存密度为3.27 g cm^-3 。HOF-NKU-1的疏水性特性即使在95%的湿度条件下也能实现高动态二氧化硫吸收和二氧化硫回收。通过组合气体吸附等温线、突破性实验和单晶衍射研究，研究了SO₂/CO₂的分离机理，为未来多功能形状记忆多孔材料的发展铺平了道路。

研究人员表示，从烟气中去除二氧化硫仍然是一个挑战。基于吸附的SO₂主题多孔材料分离已被提出为更节能和更具成本效益的替代更传统的方法，如低温蒸馏。

附：英文原文

Title: Flue gas desulfurization and SO₂ recovery within a flexible hydrogen-bonded organic framework

Author: Li, Lin, Zhang, Xuan, Lian, Xin, Zhang, Laiyu, Zhang, Zhiyuan, Liu, Xiongli, He, Tengfei, Li, Baiyan, Chen, Banglin, Bu, Xian-He

Issue&Volume: 2025-02-26

Abstract: The removal of SO₂ from flue gas remains a challenge. Adsorption-based separation of SO₂ using porous materials has been proposed as a more energy-efficient and cost-effective alternative to more traditional methods such as cryogenic distillations. Here we report a flexible hydrogen-bonded organic framework (HOF-NKU-1) that enables the sieving of SO₂ through the guest-adaptive response and shape-memory effect of the material. HOF-NKU-1 exhibits a high selectivity of 7,331 for the separation of SO₂/CO₂ and a high SO₂ storage density of 3.27g cm^-3 within the pore space at ambient conditions. The hydrophobic nature of HOF-NKU-1 enables high dynamic SO₂ uptake and SO₂ recovery, even in conditions of 95% humidity. The SO₂/CO₂ separation mechanism is studied through combinatorial gas sorption isotherms, breakthrough experiments and single-crystal diffraction studies, paving the way for the development of multifunctional shape-memory porous materials in the future.

DOI: 10.1038/s41557-025-01744-9

Source: https://www.nature.com/articles/s41557-025-01744-9