PubMed: Microwave-assisted solid-state pretreatment for fabrication of hemp fibres using ethanolamine at low temperature

PubMed: Microwave-assisted solid-state pretreatment for fabrication of hemp fibres using ethanolamine at low temperature

Carbohydr Polym. 2024 May 15;332:121906. doi: 10.1016/j.carbpol.2024.121906. Epub 2024 Feb 1.

ABSTRACT

Conventional methods faced challenges in pretreating natural cellulose fibres due to their high energy consumption and large wastewater drainage. This research devised an efficient solid-state pretreatment method for pretreating hemp fibres using ethanolamine (ETA) assisted by microwave (MW) heating. This method produced a notable removal rate of lignin (85.4 %) with the highest cellulose content (83.0 %) at a high solid content (30 %) and low temperature (70 °C). Both FT-IR and XRD analyses indicated that the pretreatment did not alter the structure of cellulose within the hemp fibres but increased crystallinity as the CrI increased from 84 % in raw hemp fibre to 89 % in pretreated fibre. As a result, it produced hemp fibres with impressive fineness (4.6 dtex) and breaking strength (3.81 cN/dtex), meeting the requirement of textile fibre. In addition, an improvement in glucose concentration (15.6 %) was observed in enzymatic hydrolysis of the MW pretreated hemp fibres compared to the fibres pretreated without MW. Furthermore, the FT-IR and NMR data confirmed that the amination of lignin occurred even at low temperature, which contributed to the high lignin removal rate. Thus, this study presents a potentially effective energy-saving, and environmentally sustainable solid-state method for pretreating hemp fibres.

PMID:38431392 | DOI:10.1016/j.carbpol.2024.121906

https://pubmed.ncbi.nlm.nih.gov/38431392/?utm_source=Chrome&utm_medium=rss&utm_campaign=pubmed-2&utm_content=1Ds1JEbG0OWaBdqM3tTUGjkFhFGaOtMecPdpuvzbuubWi6d9Fn&fc=20231022105433&ff=20240303182115&v=2.18.0.post9+e462414 March 2, 2024 11:00 am