24 / 2021-06-26 10:40:18

Novel deconstruction of poplar wood using peracetic acid synergized with Fe(Ⅲ) under a hydrothermal condition

Keywords: Poplar; Fe(Ⅲ); Peracetic acid; Deconstruction; Saccharification

Lignocellulose is the most abundant carbohydrate resource in the world, and is also a renewable resource that can be used in a biorefinery as a substitute for petroleum and other fossil fuels. In this work, peracetic acid and Fe(Ⅲ) were used to conduct directional deconstruction of hemicellulose in poplar to solve the problems of difficult degradation and poor enzymatic hydrolysis of poplar. Compared with the traditional hydrothermal method, the method can realize the reaction under normal temperature and pressure without using the reaction kettle of higher temperature and pressure. Under suitable pretreatment conditions, 5.7 % (w/v) peroxyacetic acid, 0.05 mol/L Fe(Ⅲ), 100 ℃, 60 min; The removal rate of hemicellulose reached 93%, and the retention rate of cellulose reached 74 %. Scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), thermogravimetric analysis (TG) and X-ray photoelectron spectroscopy (XPS) were used to characterize the samples of raw materials, pretreatment and enzymatic hydrolysis in order to explain the changes in the morphology, composition and crystallinity of the samples. In this study, Materials Studio（MS）was also used to simulate the change of binding energy, kinetic equation and action mechanism in the reaction process. After pretreatment, the saccharification efficiency of enzymatic hydrolysis was improved that it was as high as 92 %.The results showed that peracetic acid combined with Fe(Ⅲ) could effectively improve the pretreatment effect of poplar and enhance the saccharification rate of enzymatic hydrolysis.