Mg-M(Al,Fe)层状双氢氧化物光催化降解环丙沙星试验研究

Study on Mg-M(Al,Fe)Layered Double Hydroxides Photocatalytic Degradation of Ciprofloxacin

采用共沉淀法制备镁基层状双氢氧化物(Mg-Al-LDHs和Mg-Fe-LDHs)光催化剂,所得到的Mg-Al-LDHs (白色)和Mg-Fe-LDHs (红褐色)颜色明显不同。通过X射线衍射仪和扫描电镜对催化剂进行了表征。以光催化降解典型抗生素环丙沙星为模型反应,在模拟太阳光照射下,Mg-Al-LDHs明显比Mg-Fe-LDHs催化活性高;在可见光照射下,Mg-Al-LDHs基本没有催化活性,Mg-Fe-LDHs有一定催化活性但较低。光学性质、吸附性能和荧光光谱测试结果表明,模拟太阳光照射下,影响光催化活性的因素为吸附性能;在可见光照射下,影响光催化活性的因素是催化剂光吸收范围。

The magnesium-based layered double hydroxide(Mg-Al-LDHs and Mg-Fe-LDHs)photocatalyst is prepared by co-precipitation method.The color of the prepared product is obviously different,Mg-Al-LDHs are white and Mg-FeLDHs are reddish-brown.The catalyst is characterized by X-ray diffraction and scanning electron microscopy.The photocatalytic degradation of the typical antibiotic ciprofloxacin is used as a model reaction.Under simulated sunlight irradiation,Mg-Al-LDHs are significantly more active than Mg-Fe-LDHs.Under visible light irradiation,Mg-Al-LDHs have little catalytic activity,and Mg-Fe-LDHs have a certain catalytic activity but it is low.Through optical properties,adsorption properties and fluorescence spectrum testing,it shows that under the simulated sunlight irradiation,the factors influencing the photocatalytic activity are the adsorption performance,but under visible light irradiation,the factor influencing the photocatalytic activity is the range of light absorption of catalyst.