复合磁性光催化剂Co_(0.5)Zn_(0.5)Fe_2O_4/Bi_2WO_6的制备及其光催化性能

以Co_(0.5)Zn_(0.5)Fe_2O_4为磁基体,制备了Co_(0.5)Zn_(0.5)Fe_2O_4/Bi_2WO_6复合磁性光催化剂。分别采用XRD、SEM、EDS和PL光谱技术对光催化剂进行了表征。利用氙灯为光源,以环丙沙星为目标污染物,考察了光催化剂对环丙沙星的降解性能。表征结果显示:复合磁性光催化剂中Bi_2WO_6晶相含量高,且结晶度大;Co_(0.5)Zn_(0.5)Fe_2O_4与Bi_2WO_6的质量比为1∶8时,Co_(0.5)Zn_(0.5)Fe_2O_4磁基体与Bi_2WO_6基本复合(该复合磁性光催化剂以Co_(0.5)Zn_(0.5)Fe_2O_4/Bi_2WO_6(Ⅱ)表示);Co_(0.5)Zn_(0.5)Fe_2O_4/Bi_2WO_6复合光催化剂光生空穴和电子复合几率低,具有较好的光催化性能。实验结果表明,Co_(0.5)Zn_(0.5)Fe_2O_4/Bi_2WO_6(Ⅱ)具有较高的光催化活性,光催化反应140 min后对环丙沙星的降解率达82.39%,且具有良好的磁性能,易实现固液分离,便于回收再利用。

Preparation of Co0.5Zn0.5Fe2O4/Bi2WO6 composite magnetic photocatalyst and its photocatalytic activity

Co_0.5Zn_0.5Fe₂O₄/Bi₂WO₆ composite magnetic photocatalyst was prepared using Co_0.5Zn_0.5Fe₂O₄ as magnetic matrix,and characterized by XRD,SEM,EDS and PL spectra. The degradation capability of the photocatalyst was evaluated under xenon lamp and using ciprofloxacin（CIP）as target contaminant. The characterization results show thatBi₂WO₆ in the composite magnetic photocatalyst has a high content of crystalline phases and a large degree of crystallinity;when the mass ratio of Co_0.5Zn_0.5Fe₂O₄ to Bi₂WO₆ is 1∶8,Co_0.5Zn_0.5Fe₂O₄ and Bi₂WO₆ are mostly compounded（this photocatalyst is denoted by Co_0.5Zn_0.5Fe₂O₄/Bi₂WO₆（Ⅱ））;The recombination of photo-generated electrons and holes of Co_0.5Zn_0.5Fe₂O₄/Bi₂WO₆ composite photocatalyst is low,which causes good photocatalytic performance of the photocatalyst. The experimental results show thatThe photocatalytic activity of Co_0.5Zn_0.5Fe₂O₄/Bi₂WO₆（Ⅱ）is high,and the degradation rate of CIP is 82.39% after photocatalytic reaction for 140 min;Co_0.5Zn_0.5Fe₂O₄/Bi₂WO₆（Ⅱ）has good magnetic performance,so it can be easily recycled and reused after solid-liquid separation.