氮掺杂多孔碳负载甲基化聚乙烯亚胺对二氧化硫的有效吸附

Effective adsorption of sulfur dioxide by nitrogen-doped porous carbon-loaded methylated polyethyleneimines

为了解决目前难以大量处理二氧化硫排放的问题,将富含叔胺基团的甲基化聚乙烯亚胺(mPEI)负载到对二氧化硫有一定吸附性的氮掺杂多孔碳(GU-1)上,制备了多种比例的负载产物(n mPEI@GU-1),并考察n mPEI@GU-1对二氧化硫的吸附能力。研究结果表明:在25℃和101.3 kPa的条件下,n mPEI@GU-1对SO 2的吸附量可以达到5.10~7.01 mmol·g^(-1),复合物相比单一组分,吸附二氧化硫的能力有较大提升。随着温度升高,样品对于二氧化硫的吸附性能逐渐降低,符合气体吸附规律,并通过多次重复实验证明了所制备的样品对SO 2具有良好的可逆吸附能力。

To solve the difficulty of processing sulfur dioxide emissions in large quantities,it was proposed to load methylated polyethyleneimine(mPEI),which is rich in tertiary amine groups,onto nitrogen-doped porous carbon(GU-1)with certain adsorption capacity for sulfur dioxide,to prepare multiple proportions of loading products(n mPEI@GU-1),and to investigate the adsorption capacity of n mPEI@GU-1 on sulfur dioxide.The results showed that under the conditions of 25℃and 101.3 kPa,the adsorption capacity of n mPEI@GU-1 for sulfur dioxide reached 5.10-7.01 mmol·g^(-1),and the adsorption capacity of complexes for sulfur dioxide was greatly improved compared with that of the single component.As the temperature increased,the adsorption performance of the sample for sulfur dioxide gradually decreased,which conformed to the gas adsorption law.It was proved that the prepared samples had good reversible adsorption capacity for sulfur dioxide through several repetitive experiments.