C/ZnO/BiOI的制备及其光催化头孢他啶性能

Preparation of C/ZnO/BiOI and Its Photocatalytic Property for Ceftazidime

以乙酸锌、氢氧化钠为原料,采用水热法制备纳米级ZnO,然后以葡萄糖为碳源,制备C/ZnO纳米材料,再采用超声方法将事先制备好的BiOI与C/ZnO进行复合,得到了三元复合材料C/ZnO/BiOI。采用X-射线衍射仪(XRD)、扫描电镜(SEM)、X-射线光电子能谱分析仪(XPS)、紫外-可见分光光度计(UV-Vis)、光致发光光谱仪(PL)等对样品进行表征。结果表明,C/ZnO/BiOI三元复合催化剂的结晶性好,纯度高。交错的晶格条纹显示出ZnO与BiOI之间形成了异质结。异质结延缓了电子与空穴的结合,同时C良好的电荷传导性加速了载流子传输效率,极大地提高了光催化活性。在汞灯模拟太阳光条件下,C/ZnO/BiOI对头孢他啶的降解率在180 min内达到了98.52%,相比于ZnO提高了51.07%。

Nano‑ZnO was prepared by hydrothermal method with zinc acetate and sodium hydroxide as raw materials,and then nano‑C/ZnO was prepared with glucose as carbon source.The prepared BiOI was compounded with C/ZnO by ultrasonic method to obtain ternary composite C/ZnO/BiOI.The C/ZnO/BiOI samples were characterized by X‑ray diffraction(XRD),scanning electron microscopy(SEM),X‑ray photoelectron spectroscopy(XPS),ultraviolet visible diffuse reflectance spectroscopy(UV‑Vis)and photoluminescence(PL).The ternary composite catalyst C/ZnO/BiOI had good crystallinity and high purity.The interlaced lattice fringes showed that there were heterojunctions between ZnO and BiOI.The heterojunction delayed the binding of electrons and holes,and the good charge conductivity of C accelerated the carrier transport efficiency and greatly improved the photocatalytic activity.Under the simulated sunlight created by mercury lamp,C/ZnO/BiOI demonstrated degradation rate of 98.52%for ceftazidime within 180 min,which was 51.07%higher than that of ZnO.