Study On The Structure And Chemical Composition Of Moso Bamboo And The Construction And Performance Of Its Composite Materials

The discharge of organic dye wastewater is a serious threat to human health and the ecosystem.Zeolite imidazole framework(ZIF-67)is a promising heterogeneous catalyst that can activate peroxymonosulfate(PMS)to degrade organic pollutants in water.However,ZIF-67 nanoparticles are very small and difficult to recycle in actual environmental remediation,resulting in loss of catalyst.Relying on the abundant bamboo resources in Chongyi County,Jiangxi Province,this thesis uses the observation of the structure,crystallinity and composition of the moso bamboo.A kind of bamboo cellulose-based nano carrier material was constructed by using the dense fibers of moso bamboo to provide support and the thin-walled cells of hollow microcapsules to provide space.The research on the adsorption and catalytic performance of the bamboo-based nanocomposite has been preliminarily discussed.The specific content is as follows:1.Moso bamboo cell morphology observation and crystallinity determinationThe vascular bundle system and basic parenchyma of moso bamboo can be clearly seen under the scanning electron microscope.The vascular bundles are in the shape of plum blossoms.The fiber bundles are tightly arranged,which provides high-strength mechanical properties for moso bamboo.The basic parenchyma is a hollow circular or elliptical thin-walled tissue,and individual parenchyma exhibits an irregular shape.The thickness of the cell wall of parenchyma cells is not much different.It is composed of multiple layers of cellulose.The adhesion between cells is relatively loose,and there are many small holes in the parenchyma cells.The pore size distribution statistics of Moso bamboo parenchyma cells of different bamboo ages show that the 0.5-year pore size is mainly distributed between 40-60 ?m,the 2.5-year pore size is mainly distributed between 30-50 ?m,and the 4.5-year pore size is mainly distributed in Between35-50 ?m,the 6.5-year pore size is mainly distributed between 35-55 ?m.It can be seen that the lateral pore size of parenchyma cells decreases with the increase of bamboo age.When the bamboo age reaches 2.5 years and later,the pore size tends to be stable,mostly concentrated in the range of35-55 ?m.The bamboo ages of 0.5 years,2.5 years,4.5 years and 6.5 years were measured by X-ray powder diffraction(XRD).It is calculated that the crystallinity of the cellulose of moso bamboo in0.5 years is 38.45%;the crystallinity of cellulose in 2.5 years is 40.84%;the crystallinity of cellulose in 4.5 years is 38.63%;the crystallinity of cellulose in 6.5 years is 38.69 %.2.Determination of Eight Chemical Components of Moso bamboo in Chongyi CountyThe 6.5-year-old Chongyi Moso bamboo was used as the research object to determine its main chemical components.The cellulose content in the bamboo is 46.10%,the polypentose content is22.21%,the acid-insoluble lignin content is 24.03%,the ash content is 0.91%,the moisture content is 11.64%,and the hot water extract content is 9.96%,The 1% Na OH extract content is 28.97%,and the phenyl alcohol extract content is 3.50%.3.Study on the Construction of Bamboo-based Nanocomposite and Its Adsorption and Catalytic PerformanceUsing the dense fibers of moso bamboo to provide support,and the thin-walled cells of the hollow microcapsules to provide space,nano-ZIF-67 particles are grown in situ on the bamboo cellulose flakes,the size of which is mainly between 170-250 nm,and the adsorption catalyst is constructed after carbonization.The integrated composite material has a specific surface area of326.5466 m2/g,and the adsorption rate of rhodamine B within one hour is 87.9%.Because the composite material has both catalytic performance and high adsorption performance,the effect of removed rhodamine B after adding PMS is stronger than that of pure ZIF-67 nanoparticles.