XPS analysis of bamboo dissolving pulp in bleaching process

The change of surface chemical composition of bamboo pulp at bleaching stage during its preparation was analyzed with X-ray photoelectron spectroscopy(XPS).The ratio of O/C increased during bleaching process except bleaching stage,indicating the surface concentrations of lignin and extractive were reduced except bleaching stage.The calculation of lignin and extractive contents on the surface of bamboo pulp showed that the decrease of O/C in the stage of H2O2bleaching was primarily due to the transition of extractives from internal to surface.When further extraction was performed at the end of bleaching,the ratio of O/C approached to the theoretical value of cellulose.The contents of C1—C4 in C1s peaks for bamboo pulp obtained in various bleaching stage were analyzed,and how the chemical composition of bamboo pulp varies with the bleaching progressing was disclosed.The results also demonstrated that there was the same effect for xylanase and DMD treatments,that is,hemicellulose and lignin were removed effectively.