This study aimed to prepare a bio-based organic adsorbent (W-PEI) with amine functionalization via Schiff’s reaction without carbonization of biomass. The bio-based organic adsorbent was prepared from wheat bran husk (WH), and amine functionalized to absorb CO₂ gas by conjugating polyethyleneimine (PEI) via Schiff’s reaction to the aldehyde groups of periodated WH (p-WH). Then, the bio-based organic adsorbent was compounded with low-density polyethylene (LDPE) using a twin screw extruder. The polymeric composites (LDPE/W-PEI) and W-PEI were studied to characterize chemical structure, thermal properties, and CO₂ adsorption ability. The CO₂ adsorption capacity was measured by thermogravimetric analysis (TGA), and the analysis was performed through the exchange of N₂ and CO₂ under isothermal conditions at 75 °C. The amount of CO₂ adsorption was 0.425 mmol/g of W-PEI powder, while that of polymeric composite (LDPE/W-PEI_20%) containing 20 wt% W-PEI was 0.034 mmol/g, which corresponds to an adsorption efficiency of 40% compared to that of the powder state. Therefore, polymeric composites with improved CO₂ gas adsorption could be successfully applied to food packaging and building materials.

这项研究的目的是通过希夫反应制备一种具有胺功能的生物基有机吸附剂（W-PEI），而不会使生物质碳化。该生物基有机吸附剂由麦麸壳（WH）制备，并通过席夫反应将聚乙烯亚胺（PEI）与高碘WH（p-WH）的醛基共轭，从而使胺官能化以吸收CO ₂气体。然后，使用双螺杆挤出机将生物基有机吸附剂与低密度聚乙烯（LDPE）混合。研究了聚合物复合材料（LDPE / W-PEI）和W-PEI的化学结构，热性能和CO ₂吸附能力。一氧化碳₂通过热重分析（TGA）测量吸附容量，并通过在75℃等温条件下交换N ₂和CO ₂进行分析。W-PEI粉末的CO ₂吸附量为0.425 mmol / g，而含20 wt％W-PEI的聚合物复合材料（LDPE / W-PEI_20％）的吸附量为0.034 mmol / g，相当于吸附效率为与粉末状态相比，降低了40％。因此，具有改善的CO ₂气体吸附的聚合物复合材料可以成功地应用于食品包装和建筑材料。