Effect of Alkaline Pretreatment on Cellulosic Structural Changes of Paulownia

Abstract:

Four different concentrations of alkaline solution for pretreatment of Paulownia biomass were comparatively studied. The extracted celluloses were characterized using Fourier Transform Infrared spectra (FTIR) for changes of the chemical group, as well as X-ray Diffraction (XRD), Scanning Electron Microscope (SEM). The four samples were untreated biomass, treated with 2%, 4% and 6%peroxide alkaline, and thena comparison between alkaline and dilute acid pretreatment on those indexes were conducted. FTIR spectra results suggested that NaOH could mainly work on lignin of the raw material while the dilute acid work on hemicellulose. The CrI of acid pretreatment and alkaline pretreatment increased to 0.5467 and 0.6395 respectively comparing with the value of 0.4347 of raw material. The XRD results suggested that both of them could act on amorphous region firstly. The SEM micrographs showed the visual structure changes of this progress. The results of enzyme hydrolysis showed 93.3% and 90.6% of the potential glucose and xylose were recovered in the pretreated biomass at 6% NaOH that proved the effects of the NaOH on cellulose structural.

• Periodical: Advanced Materials Research (Volumes 781-784)
• Pages: 947-951
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.781-784.947
• Online since: September 2013
• Authors: Yao Jie Deng, Yuan Cai Lv, Jia Qi Cheng, Yuan Cai Chen
• Keywords: Alkaline Solution, Cellulose, Paulownia, Structural Change

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