Synthesis And Properties Of The Bacterial Cellulose/Lanthanum Metal Compounds Nanofibers

Bacterial cellulose (BC) is a kind of complex natural polymer. It has broad application and attracts enough attentions from researchers due to its outstanding physical and chemical properties. Recently, many studies on BC indicate that BC shows the potential to be further applied in many other areas. By using the unique BC’s template effect, this paper studied its applications in two aspects-Phosphorus removal from wastewater and Hydrogen production by catalyzing bio-oil.Eutrophication caused by excessive nutrients in water bodies is a serious environmental problem. The study found that the key to prevent eutrophication in water body is to reduce the phosphorus content. In this paper, we use hydrothermal method to prepare La2O3/BC adsorbents for phosphorus removal with bacterial cellulose nanofibers as the templates. The structure and morphology of La2O3/BC hrbrid nanofibers were characterized by XRD, SEM, TEM, TG, FT-IR, XPS. The result showed that:La2O3 particle uniformly dispersed in the surface of the bacterial cellulose with high load capacity and smaller diameter. La2O3/BC hrbrid nanofibers were tested as adsorbents for phosphorus removal with potassium dihydrogenphosphate as the phosphorus source. The result showed that:the adsorption kinetic data were fitted to a pseudo second-order kinetic model, indicating it was chemical adsorption. The adsorbents with high rate constant k of 0.0298min-1 can achieve up to 99% P removal within 60 min with an initial concentration of 10mg·L-1. Absorption mechanism for phosphate removal confirmed lanthanum-oxide not only formed lanthanum phosphate, but also produced phosphorus and lanthanum complex on the surface of bacterial cellulose fibers.Hydrogen energy has attracted much attention as a kind of clean energy with broad source, renewable, pollution-free, good heat, etc. Hydrogen produced from renewable resources is an appealing approach. On the basis of much literature, combined with the template effect of bacterial cellulose, the paper studied the preparation and application of catalyst in methanol steam reforming. The perovskite-structured La2CuO4 nanofibers with an average diameter of 30 nm and large specific surface area were prepared by hydrothermal method using hydrated bacterial cellulose fibers. The La2CuO4 nanofibers, La2CuO4/BC hrbrid nanofibers and BC were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energydispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), N2 adsorption (BET).When come to the catalytic performance in methanol steam reforming, the results showed that La2CuO4 fiber catalyst showed good stability and catalytic performance at low temperatures, compared with La2CuO4 powder. At the temperature of 200℃ methanol was completely converted into hydrogen and CO2, without the generation of CO.