MgBi-LDHs和NiBi-LDHs光催化降解罗丹明B性能

Photocatalytic Degradation of Rhodamine B by MgBi-LDHs and NiBi-LDHs

通过共沉淀法制备MgBi-LDHs和NiBi-LDHs两种光催化剂,采用紫外可见分光光度计对催化剂进行表征分析,并探究了溶液初始pH值、催化剂物质的量之比和光照类型对罗丹明B(RhB)降解效果的影响;采用扫描电子显微镜(SEM)对材料进行形貌和元素分布进行分析。实验结果表明:溶液初始pH值为6时,在长弧氙灯照射条件下,光照4 h,Mg-Bi(3∶1)降解效果最佳,去除率达91.24%;在紫外高压汞灯照射条件下,光照4 h,Mg-Bi(5∶1)降解效果最佳,去除率达92.16%。该光催化剂的制备为降解罗丹明B提供了一种廉价、简便的措施,对其他高效光催化剂的合成具有一定的指导意义。

MgBi-LDHs and NiBi-LDHs are prepared by co-precipitation,and the catalysts are characterized and analyzed by UV/VIS spectrophotometer,and the effects of initial pH,catalyst molar ratio and light type on the degradation effect of Rhodamine B(RhB)are explored;scanning electron microscopy(SEM)is used to analyze the morphology and elemental distribution of materials.The experimental results show that when the initial pH of the solution is 6,under the condition of xenon lamp irradiation for 4 hours,Mg-Bi(3:1)has the best degradation effect,and the removal rate is as high as 91.24%;under the condition of ultraviolet lamp irradiation for 4 hours,Mg-Bi(5:1)degradation effect is the best,and the removal rate can reach 92.16%.The preparation of this photocatalyst provides a cheap and simple measure for the degradation of Rhodamine B,which has certain guiding significance for the synthesis of other high-efficiency photocatalysts.