用于 SO₂ 高效脱除的富氮有机多孔聚合物合成与表征

A method of using sulfolane and dimethylsulfone as the mixed solvents with different ratios in the synthesis of porous organic polymer (POP), Schiff-base network-1 (SNW-1) was proposed to modulate pore size and adsorption performance of SNW-1 for efficient SO₂ removal from flue gas. The experimental results showed that solvent ratio did not change the chemical composition and bond structure of SNW-1, but affected its pore size, which in turn affected the adsorption capacity and selectivity of SO₂. Among the four types of SNW-1 synthesized, SNW-1-3 with small pore size and large specific surface area shows the highest SO₂ adsorption capacity, and the SO₂/CO₂ selectivity is 124.8-159.9, which is superior to most POP materials. In addition, SNW-1 has stable reusability due to its physical adsorption process. Density functional theory (DFT) calculation reveals that SO₂ binding sites are N atoms of triazine rings and hydrogen atoms of imino groups, while CO₂ binding sites are only hydrogen atoms of imino groups.