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以三嵌段共聚物P123(EO20-PO70-EO20)为模板剂合成了介孔泡沫氧化硅(MCF)材料.MCF经过五乙烯六胺(PEHA)修饰后用于捕捉CO2.采用扫描电镜(SEM)、透射电镜(TEM)、N2吸附-脱附、傅里叶变换红外(FTIR)光谱、热重分析(TGA)对MCF和MCF-PEHA进行了表征.结果表明,PEHA对MCF改性后,并没有破坏MCF载体本身的结构.MCF-PEHA的CO2吸附量在75°C时达到最大.随着PEHA含量的增加,MCF-PEHA的CO2吸附量呈先增大后减小的趋势,当PEHA含量为70%(w)时,CO2吸附量达到最大,为3.55mmol·g-1.水汽促进了吸附剂的CO2吸附性能.研究结果还表明,MCF-70吸附剂经过四次吸脱附循环,吸附性能基本保持不变,表现出很好的可再生性能.
Mesoporous foamed silica (MCF) was synthesized by using triblock copolymer P123 (EO20-PO70-EO20) as a template. MCF was modified with PEHA to capture CO2. ), MCF and MCF-PEHA were characterized by transmission electron microscopy (TEM), N2 adsorption-desorption, Fourier transform infrared spectroscopy (FTIR) and thermogravimetric analysis (TGA) .The results showed that PEHA modified MCF, And did not destroy the structure of the MCF carrier.The CO2 adsorption capacity of MCF-PEHA reached the maximum at 75 ° C. With the increase of PEHA content, the CO2 adsorption capacity of MCF-PEHA firstly increased and then decreased, At the content of 70% (w), the maximum amount of CO2 adsorbed was 3.55 mmol · g-1. The water vapor promoted the adsorption of CO2 on the adsorbent. The results also showed that the MCF-70 adsorbent undergoes four cycles of adsorption and desorption , Adsorption performance remained unchanged, showing good renewable properties.