Valorization of Banana Peel Waste Used as Filler in Castor Oil Polyurethane Foam for Vegetal Oil Sorption

ABSTRACT

This research describes the influence of fiber content from the banana peel waste used as a filler in castor oil polyurethane foam (PU), obtaining eco-sorbent for vegetal oil sorption. Biocomposites were prepared with banana peel waste (BP) in different content: 0, 5, 10, 15, and 20 wt.%, to improve the oil sorption capacity (system PU/BP-oil). Results indicated that banana peel waste was hydrogen-bonded to PU chains, increasing the foams’ density and decreasing the pore size with an increase in fiber content, from 444 to 123 μm. The addition of fibers from banana peel to PU maintained the foams’ hydrophobicity and decreased the foams’ crystallinity. Compared to pure PU, the biocomposites showed greater thermal stability (Tonset from 247.6 to 264°C). All modified foams improved vegetal oil sorption capacity, but PU/BP20% presented better sorption capacity due to high pore size, which directly influenced the oil sorption. The response surface methodology (RSM) technique confirmed the influence of content fibers and oil sorption time.

摘要

本研究描述了香蕉皮废料中纤维含量对蓖麻油聚氨酯泡沫塑料(PU)填充物的影响,以获得用于植物油吸附的生态吸附剂. 用不同含量的香蕉皮废料(BP)制备生物复合材料:0、5、10、15和20 wt.%,以提高吸油能力(系统PU/BP油). 结果表明,香蕉皮废料与聚氨酯链氢键结合,随着纤维含量的增加,泡沫密度增加,孔径减小,从444μm增加到123μm. 将香蕉皮纤维添加到聚氨酯中,保持了泡沫的疏水性,降低了泡沫的结晶度. 与纯PU相比,生物复合材料表现出更高的热稳定性(色调从247.6到264℃). 所有改性泡沫都提高了植物油的吸附能力,但PU/BP20%由于孔径大而表现出更好的吸附能力,这直接影响了植物油的吸附. 响应面法(RSM)技术证实了纤维含量和吸油时间的影响.

KEYWORDS:

• Banana peel
• polyurethane
• castor oil
• biocomposites
• vegetal oil sorption
• pore size

关键词:

• 香蕉皮
• 聚氨酯
• 蓖麻油
• 生物复合材料
• 植物油吸附
• 孔径

Acknowledgments

This research was funded by FAPERJ (E-26/260.026/2018 and E-26/010.001800/2015).

Additional information

Funding

This work was supported by the Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro [(E-26/010.101232/2018 and E-26/010.001800/2015)].