P掺杂BiOBr的制备及其光催化固氮性能研究

Preparation of P doped BiOBr photocatalyst andits nitrogen fixation performance

具有特殊层状结构的BiOBr,在光催化固氮方面受到广泛关注。以次亚磷酸钠、五水硝酸铋为前驱体,通过溶剂热法制备出P掺杂BiOBr光催化剂。通过XRD,SEM,XPS,UV-Vis DRS、光电化学性能等来描述催化剂的特性。探究了在可见光照射下光催化固氮性能。结果表明,P掺杂增大了BiOBr的比表面积且未改变其晶体结构。同时,P掺杂提高了光生载流子的分离效率和可见光响应能力。相比纯BiOBr,P掺杂BiOBr(n(Bi)∶n(P)=15∶1)的光催化产氨为31.68 mg/(L·h·g)_(cat)是纯BiOBr的4.7倍。最后,经4次循环实验,P掺杂BiOBr光催化剂具有较好的稳定性。

BiOBr have received extensive interest for photocatalytic nitrogen fixation due to their special layered structure.In this paper,a series of P-doped BiOBr photocatalysts were successfully synthesized using sodium hypophosphite and bismuth nitrate pentahydrate as precursors through solvothermal process.The XRD,SEM,XPS,UV-Vis DRS,and photocatalytic materials were used to characterize the as-prepared catalyst.The photocatalytic nitrogen fixation performance under visible light irradiation was investigated.The results showed that P-doping increased the specific surface area of BiOBr and did not change its crystal structure.At the same time,P-doping improved the separation efficiency and visible light response of photogenerated carriers.Compared with BiOBr,the photocatalytic ammonia production of P-doped BiOBr(n(Bi):n(P)=15:1)was 31.68 mg/(L·h·g)_(cat),which was 4.7 times higher than that of BiOBr.Finally,the P-doped BiOBr has good stability after four cycles of experiments.