铝氮共掺杂溴氧化铋光催化性能的研究

Research on Photocatalytic Performance of Aluminum and Nitrogen Co-doped Bismuth Oxybromide

【目的】为解决有机染料行业所造成的水污染问题,降解有害物质罗丹明B(RhB),对铝氮共掺杂的溴氧化铋基光催化剂开展研究。【方法】采用水热合成法合成了一系列掺杂不同含量铝或氮或铝氮共掺杂的溴氧化铋(BiOBr)样品,并采用扫描电子显微镜(SEM)、X射线衍射仪(XRD)、傅里叶变换红外光谱仪(FTIR)和紫外-可见光分光光度计(UV-vis)对其进行表征。在可见光照射下,光催化降解罗丹明B。【结果】结果表明,铝和氮单独掺杂或共掺杂均能提升BiOBr的光催化性能,且铝氮共掺杂时对光催化的提升效果基本介于铝和氮单独掺杂之间。【结论】铝和氮之间对光催化性能的提升并不是简单叠加,而是存在相互作用的关系,并据此推测掺杂氮元素可以减弱掺杂铝元素对BiOBr晶格的破坏作用。

[Purposes]To address the issue of water pollution caused by the organic dye industry and degrade the harmful substance rhodamine B(RhB),research has been conducted on aluminum-nitrogen co-doped bismuth oxybromide-based photocatalyst.[Methods]A series of aluminum or nitrogen or aluminum-nitrogen co-doped bismuth oxybromide(BiOBr)samples with different doping levels were synthesized using the hydrothermal synthesis method,and characterized by scanning electron microscopy(SEM),X-ray diffraction(XRD),Fourier transform infrared spectroscopy(FTIR),and ultravioletvisible spectrophotometry(UV-vis).Photocatalytic degradation of Rhodamine B was conducted under visible light irradiation.[Findings]The results showed that both aluminum and nitrogen doping alone or co-doping could enhance the photocatalytic performance of BiOBr,and the enhancement effect of aluminum-nitrogen co-doping was basically between that of aluminum and nitrogen doping alone.[Conclusions]This indicates that the enhancement of photocatalytic performance between aluminum and nitrogen is not a simple superposition,but there is an interaction relationship.Based on this,it is speculated that doping nitrogen can weaken the damage effect of doping aluminum on the BiOBr lattice.