WS_(2)量子点修饰BiOBr光催化剂的合成及罗丹明B降解性能研究

Synthesis of BiOBr Composite Photocatalyst Modified by WS_(2) Quantum Dots and Study on the Degradation of Rhodamine B

采用自组装的方法在BiOBr表面负载二硫化钨量子点(WS_(2) QDs)合成WS_(2) QDs/BiOBr复合材料,运用X射线衍射(XRD)、透射电镜(TEM)对复合物的物相、结构等参数进行了表征。通过可见光照射下降解染料废水罗丹明B(RhB)评价WS_(2) QDs/BiOBr复合材料的光催化性能。实验结果表明,WS_(2) QDs修饰可以显著提升RhB在BiOBr催化剂表面的吸附,复合光催化剂的活性由于吸附-光催化协同效用得到很大提高。在暗处搅拌120 min和光照20 min后,10WS_(2) QDs/BiOBr对RhB的降解率约为100%,而在相同的条件下BiOBr对RhB的降解率仅在40%左右。本文对探索和设计基于量子点修饰的高性能光催化复合材料具有一定的借鉴意义。

WS_(2) QDs/BiOBr composites are successfully synthesized by self-assembly method by loading tungsten sulfide quantum dots(WS_(2) QDs)on the surface of BiOBr,and the phase and structure parameters of the composites are characterized using X-Ray Diffraction(XRD),Transmission Electron Microscope(TEM)techniques.The photocatalytic performance of WS_(2) QDs/BiOBr composite is evaluated by degradation of Rhodamine B(RhB)under visible light irradiation.The experimental results show that the modification of BiOBr by WS_(2) QDs can greatly enhance the adsorption of RhB on the surface of catalyst.It indicat that the activity of the composite photocatalyst have been greatly improved by the synergistic effect of adsorption and light illumination.The removal rate of RhB over 10WS_(2) QDs/BiOBr sample is about 100%after 120 min of dark stirring and 20 min of light irradiation,while the removal rate over pure BiOBr under the same condition is only about 40%.This work has certain guiding significance for exploring and designing high-performance photocatalytic composites based on quantum dot modification.