Preparation And Properties Of ZnO/bamboo Charcoal Composite

ZnO is a semiconductor with direct band gap. ZnO is more capable of forming electron trap because of the presence of oxygen vacancy, thereby accelerating the separation of electron- hole pair and improving the photocatalytic activity of ZnO. ZnO is often used as a photocatalyst in the degradation of dye in water treatment and disinfection. Using the powder ZnO directly in degradation, could easily lead to the gathered reunion of ZnO and affect its recyclable catalytic effect. Suitable carriers can not only reduce the producing cost of the catalyst, and also can provide a suitable pore structure, increasing the effective surface area involved in the reaction, the photocatalytic activity of the photocatalyst and so on. Bamboo charcoal is a green carrier material whose producing process is simple, which producing less environmental pollution than the activated charcoal requiring further producing procedure, In addition, doping Ce can reduce the recombination rate of electron- hole of ZnO coated on the bamboo charcoal surface, improving the utilization rate of the ZnO carrier and its photocatalytic activity.Using Solvothermal method can not only reach the higher pressure than the hydrothermal method with lower reaction tempreture, and also the structural unit in the reactants can be effectively retained in the products without damage. In this article ZnO/bamboo charcoal composite was prepared by Solvothermal method and by doping Ce to improve the photocatalytic properties of ZnO/Bamboo charcoal composites. Furthermore, study the influence of added amount of DETA and roasting temperature on photocatalytic properties of ZnO/bamboo charcoal composites. At the same time, the effect of Ce（NO3）3 concentration on photocatalytic properties of Ce doped Zn O/bamboo charcoal composites were also studied.By X-ray diffraction（XRD）, scanning electron microscope（SEM）, Fourier transform infrared spectroscopy（FT-IR）, UV-visible diffuse reflectance（Uv-vis）, photoluminescence（PL）, photocatalysis experiments testing and data analysis, the optimal condition to prepare ZnO/bamboo charcoal composites was V₍DETA=600 μL, T=400 ℃, after 4h in ultraviolet irradiation, the degradation rate of methyl orange by ZnO/bamboo charcoal composite was 97.9%, while under the same conditions the adsorption rate of methyl orange by bamboo charcoal was 12.8% and the degradation rate of methyl orange by ZnO was 72.0%, In addition, under simulated sunlight, ZnO/bamboo charcoal showed better antibacterial properties when V₍DETA = 600μL, T = 400 ℃ and the bacteriostatic circle average diameter of E.coli was 9.75 mm, further indicating that ZnO/charcoal preparation has better photocatalytic activity under this conditionIn order to increase the photocatalytic activity of ZnO/bamboo charcoal composites, Ce doped ZnO/bamboo charcoal composites were prepared. The results showed that after 1.5h under UV light, the degradation rate of methyl orange by Ce-doped ZnO/bamboo charcoal increased 7.8% compareing to the undoped ZnO/bamboo charcoal. The bacteriostatic circle average diameter of E.coli under the condition of Ce doped ZnO/bamboo charcoal were bigger than undoped ZnO/bamboo charcoal, which showed that the right amount of Ce doping can improve the photocatalytic properties of ZnO/bamboo charcoal.