Pretreatment Of Eucalyptus Fiberboard With Fenton Reagent

Eucalyptus wood as a strategic tree species in southern China,is an important raw material for fiberboard.The recycling and recycling of discarded wood products made from eucalyptus wood is the subject of the wood processing industry,which will help to alleviate the shortage of wood in China.In this paper,we used the waste eucalyptus fiberboard as the substrate and pretreated with Fenton reagent.The effect of the single factor method and the response surface method on the conversion rate of eucalyptus fiberboard was studied.The factors influencing the ferrous ion and peroxidation The molar ratio of hydrogen,the concentration of hydrogen peroxide,the size of the substrate,and the loading of the treatment system.The results are as follows:?1?The single factor expriment showed that the optimum conditions for the treatment of Eucalyptus fiber powder were as follows:the ratio of hydrogen peroxide to ferrous ion molar concentration was 70,the concentration of hydrogen peroxide was 0.125mol/L,the-4loading Is 2.50%and the particle size is 40-60 mesh?2.5 to 3.8×10m?.?2?With the sugar conversion rate as the response value,the regression equation was obtained by the corresponding surface method:R₁=208.60-1.13×A+0.59×B+3.75×C+5.46×D-2.45×A×B+1.10×A×C-3.65×A×D+3.30×B×C-3.33×B×D-5.00×C×D-13.97×A²-11.01×B²-9.35×C²-15.93×D²Wherein R1 is the sugar conversion rate,A is the ratio of the concentration of hydrogen peroxide to ferrous ions in the Fenton reagent,B is t he concentration of hydrogen peroxide in the Fenton reagent,C is the amount of the eucalyptus fiberboard powder,D For the time of sieving.It can be seen from the regression equation analysis that the conversion rate of the powder of the eucalyptus fiberboard powder is the response value,the molar concentration ratio and the particle size,the hydrogen peroxide concentration and the loading,the hydrogen peroxide concentration and the particle size,the loading and the particle size The effect of size o n the sugar conversion was significant.The interaction between the molar concentration ratio and the hydrogen peroxide concentration,the molar ratio and the loading is not significant.After pretreatment with Eucalyptus fiber powder powder under the best pretreatment condition,the optimum sugar conversion rate of 208 h was obtained.?3?The results of IR and XRD showed that the structure of the hydroxyl structure and the lignin structure decreased gradually with the increase of Fenton reagent concentration and the decrease of the loading amount.This indicates that the degradation of the fiber structure of Eucalyptus fiberboard is also increasing.And the crystallinity of the eucalyptus fiberboard powder decreased gradually with the increase of the concentrat ion of hydrogen peroxide in the Fenton reagent.This suggests that increasing the concentration of the Fenton reagent pretreatment reagent and reducing the loading of the eucalyptus fiberboard powder will make the eucalyptus fiberboard powder more susceptible to degradation.The degreased agent reduces the crystallinity of the cellulose and causes some degradation,which leads to a lower correlation between crystallinity and unit hydrolysis and sugar conversion.?4?The infrared spectrum of Eucalyptus fiber powder treated by Fenton reagent was more degraded by infrared spectroscopy,and its infrared spectrum had more characteristic absorption peak than that of Eucalyptus fiber powder pretreated by Fenton reagent,And more hydrogen bonds in the cellulose are ope ned,compared to the untreated eucalyptus fiberboard powder,the degree of degradation is relatively high.This indicates that the Eucalyptus fiber powder treated with Fenton reagent has better biocompatibility,and pretreatment of Fenton reagent contributes to the degradation of microorganisms.