CAJ | 학술논문

以表面活性剂聚乙烯吡咯烷酮(PVP)作为结构导向剂，在乙二醇-水混合溶剂热条件下合成由纳米片组装而成的具有高可见光催化活性的花状Bi2WO6催化剂。并利用X射线衍射(XRD)、场发射扫描电镜(FESEM)、高分辨透射电镜(HRTEM)、红外光谱(FTIR)、紫外漫反射(UV-DRS)等测试手段对催化剂进行了表征。结果表明，降低前驱液pH值，可得到正交晶系钨铋矿型结构的Bi 2 WO 6光催化剂，其中pH值为1.0时、以1.0 g PVP辅助混合溶剂热法制备的Bi 2 WO 6晶体呈花状，其直径为1.5~2.5μm。相比未添加PVP制备的片状Bi 2 WO 6颗粒，花状Bi 2 WO 6样品的紫外-可见光吸收边发生红移，其能带隙减小至2.51 eV，比表面积增大。可见光催化降解甲基橙溶液的结果表明，以花状Bi 2 WO 6样品为光催化剂，可见光照射6 min、浓度为10 mg/L甲基橙溶液的脱色率可达到100%，循环使用5次后其光催化活性并没有明显降低，证明Bi 2 WO 6是一种稳定有效的实用可见光催化剂。
이표면활성제취을희필각완동(PVP)작위결구도향제，재을이순-수혼합용제열조건하합성유납미편조장이성적구유고가견광최화활성적화상Bi2WO6최화제。병이용X사선연사(XRD)、장발사소묘전경(FESEM)、고분변투사전경(HRTEM)、홍외광보(FTIR)、자외만반사(UV-DRS)등측시수단대최화제진행료표정。결과표명，강저전구액pH치，가득도정교정계오필광형결구적Bi 2 WO 6광최화제，기중pH치위1.0시、이1.0 g PVP보조혼합용제열법제비적Bi 2 WO 6정체정화상，기직경위1.5~2.5μm。상비미첨가PVP제비적편상Bi 2 WO 6과립，화상Bi 2 WO 6양품적자외-가견광흡수변발생홍이，기능대극감소지2.51 eV，비표면적증대。가견광최화강해갑기등용액적결과표명，이화상Bi 2 WO 6양품위광최화제，가견광조사6 min、농도위10 mg/L갑기등용액적탈색솔가체도100%，순배사용5차후기광최화활성병몰유명현강저，증명Bi 2 WO 6시일충은정유효적실용가견광최화제。
The flower-like Bi2WO6 porous microspheres self-assembled by nanosheets were synthesized through a complex solvothermal process using surfactants PVP as the structure-directing agent. The properties of the as-prepared samples were investigated by X-ray diffractometry (XRD), field emission scan electron microscopy (FESEM), high resolution transmission electron microscopy (HRTEM), Fourier transform infrared spectrometry (FTIR) and UV-Vis diffusion reflectance spectra (UV-DRS) tests. The results show that Bi2WO6 with orthorhombic structures can be obtained through reducing the pH value of precursor solution. Under the pH values of 1.0, the Bi 2 WO 6 flowers with diameter varied in the range of 1.5-2.5 μm can be obtained via a complex solvothermal route assisted by 1.0 g PVP. Compared with Bi2WO6 catalyst synthesized without PVP, the absorption band of the Bi2WO6 flowers assisted with PVP shows a significant red-shift and its band gap is narrowed to 2.51 eV and the specific surface area increases. The photocatalytic activity of the Bi2WO6 flowers assisted with 1.0 g PVP reaches 100% discoloration rate when 10 mg/L methyl orange solution is irradiated by visible light irradiation for 6 min. In addition, after 5 recycles, there is no significant degradation decrease in the photocatalytic activities of Bi2WO6 samples, indicating that the Bi2WO6 is a stable, effective and useful photocatalyst for the degradation of methyl orange under visible light irradiation.