片状NaBiO_3的制备及可见光降解四环素性能  

Preparation of flake NaBiO_3 and its photocatalytic degradation of the tetracycline in visible light irradiation

作　　者：唐新德 刘成碌 王正容 TANG Xin-de;LIU Cheng-lu;WANG Zheng-rong(Department of Materials and Chemical Engineering, Hunan Institute of Technology-, Hengy-ang 421002, China)

机构地区：[1]湖南工学院材料与化学工程学院,湖南衡阳421002

出　　处：《应用化工》2018年第4期726-729,共4页Applied Chemical Industry

基　　金：湖南省自然科学基金项目资助(2015JJ2043);湖南省重点建设学科项目资助;湖南省教育厅项目资助(15C0356);大学生创新训练计划项目(H1524;H1607)

摘　　要：以硝酸铋、次氯酸钠和氢氧化钠为原料,采用液相沉淀法制备了片状NaBiO_3。通过XRD、SEM和UV-Vis DRS等对片状NaBiO_3的物相、微观形貌和光吸收性能进行了表征。以四环素溶液为目标降解物,在可见光下进行光催化降解实验。结果表明,通过该方法合成的片状NaBiO_3结晶度较高、带隙宽度约为2.4 e V,对四环素具有良好的可见光降解活性,催化剂用量及溶液的pH值对四环素的光降解反应有影响,当催化剂用量为50 mg/50 m L,溶液pH值为3时,片状NaBiO_3对20 mg/L的四环素光催化降解率高达90.3%。光催化降解四环素的反应基本符合一级动力学模型。Flake NaBiO3 were prepared by a liquid-phase precipitation method with bismuth nitrate,sodium hypochlorite and sodium hydroxide as raw materials. The phase,morphology and optical absorption of the product were characterized by X-ray diffraction,scanning electron microscopy and UV-Vis diffuse reflectance absorption spectroscopy,respectively. The photocatalytic activity of samples was evaluated under visible light irradiation using tetracycline as probe molecule. The results show that the crystallinity of flake NaBiO3 was high,its band gap width was about 2. 4 e V,and its degradation activity under visible light irradiation for tetracycline was good. The photocatalyst dosage and the pH value of the solution had impact on the photodegradation reaction. The degradation rate of 20 mg/L tetracycline solution was up to 90. 3 %when the photocatalyst dosage was 50 mg/50 m L and the pH value of the solution was 3. The photocatalytic degradation of tetracycline basically conforms to the first-order kinetic model.

关 键 词：片状NaBiO3 光降解 四环素 动力学 

分 类 号：TQ426.64[化学工程]