摘要
采用软化学法制备了 BiOBrxCl1-x样品，采用X射线衍射（XRD）、扫描电子显微镜（SEM）和紫外-可见漫反射光谱（DRs）对所制得的BiOBrxCl1-x样品进行表征，并以罗丹明B（RhB）为探针，研究BiOBrxCl1-x样品的光催化性能。表征结果表明：BiOBr纳米片为单相四方晶型，粒径为600-700nm，禁带宽度为2．60eV；BiOBr0．75Cl0.25纳米片为异质节，粒径为200-300nm，禁带宽度为2．65eV；BiOBr0.5Cl0.5也为畀质节，粒径为200-300nm，禁带宽度为2．95eV；BiOBr0．25Cl0.75结构以BiOCl四方晶型为主，Br元素以无定形状态存在，粒径为150-300nm，纳米片呈现半透明，禁带宽度为2．99eV；BiOCl纳米片为单相四方晶型，粒径为100-300nm，禁带宽度为3．08eV。光催化降解RhB结果表明，BiOBr0.25 Cl0.75样品的活性最高。
The BiOBrxCl1-x nanoplates were prepared by a soft chemical method. And crystalline phase, mor phology, optical property and photocatalytic efficiency of BiOBr, Cll , nanoplates were studied by XRD, SEM, DRS and RhB photodegradation under visible-light irradiation. The characterization results showed that the particle sizes and band gap energies of tetragonal phase of BiOBr nanoplates were 600 -700 nm and 2.60 eV, respectively. And the particle size and band gap energy of BiOBr0. 75 Cl0. 25 heterogeneous section was 200-300 nm and 2.65 eV, respectively. The particle size and band gap energy of BiOBr0. 5Cl0.5 heterogeneous section was 200-300 nm and 2.95 eV, respectively. Crystal structure of BiOBr0. 25 Cl0.75sample was tetragonal phase of BiOCl and the Br was dispersed as amorphous. Moreover, particle size and band gap energy of this sample was 150-300 nm and 2.99 eV, respectively, Crys tal structure, particle size and hand gap energy of BiOCl sample was tetragonal phase, 100-300 nm and 3.08 eV, respectively. The results of photocatalytic activity showed that RhB photodegradation was highest over BiOBr0. 25 Cl0.75 sample among as-prepared BiOBr, Cl1-x samples.
