Bi24O31Br10/BiOBr复合物纳米片的制备及光催化降解环丙沙星抗菌剂的性能研究

Facile Synthesis of Bi24O31Br10/BiOBr Composite Nanosheets for Visible Light Photodegradation of Antibacterial agent Ciprofloxacin

摘要:

以Bi(NO3)3. 5H2O和十六烷基三甲基溴化铵（CTAB）为原料，用三乙醇胺为pH调节剂，溶剂热法制备Bi24O31Br10 / BiOBr 复合物纳米片。运用XRD，SEM，BET，UV-Vis等手段对所得样品进行表征。改变三乙醇胺的量和调节Bi(NO3)3. 5H2O和CTAB 物质量比例可调控所得物质的组成、微结构和形貌。在可见光下降解无色的环丙沙星抗菌剂（CIP）溶液来评价所制备样品的光催化性能，当三乙醇胺的体积为8mL、Bi和Br的物质量比为1:1时所得样品S-1.0-8 (Bi24O31Br10 / BiOBr) 具有最佳的光催化性能，它的速率常数为不加三乙醇胺所得纯BiOBr的4倍。Bi24O31Br12和BiOBr 间载流子的迁移，高的比表面积和氧空穴都有助于提高所得产品的光催化性能。

Abstract:

The Bi24O31Br10/BiOBr composite nanosheets were synthesized by a facile solvothermal method using Bi(NO3)3. 5H2O and cetyltrimethyl ammonium bromide (CTAB) as materials, employed triethanolamine (TEOA) as pH regulator. The obtained samples were characterized by X-ray diffractometer (XRD), Scanning electron microscope (SEM), Brunauer–Emmett–Teller (BET) measurement, UV-Vis absorption spectrometer. The composition, microstructure and morphology of the obtained products can easily be controlled by tuning the amount of TEOA and the atomic ratios of bromide and bismuth in the reaction system. The photocatalytic activity of the obtained products was evaluated by the degradation of colorless antibiotic agent ciprofloxacin (CIP) under visible light irradiation (λ≥420 nm). When the amount of TEOA was 8 mL and the molar ratio of bromide and bismuth source was 1:1, the obtained composite Bi24O31Br10/BiOBr exhibited the highest photocatalytic activity. Its reaction rate constant is about 4.0 times higher than that of pure BiOBr, which is mainly attributed to the charge transfer between BiOBr and Bi24O31Br10. Moreover, the high specific surface area and the abundant oxygen vacancies also contribute to the high photocatalytic activity.