在这项研究中,采用化学溶液分解法制备了不同成分的Ti掺杂Bi2O3光催化材料。用于降解活性亮蓝KN-R,然后用XRD表征,SEM,UV-visDRS,XPS,光电流,和其他检测方法。结果表明,当催化剂用量为1.0g/L,活性艳蓝KN-R的初始浓度为20mg/L时,纯Bi2O3对活性艳蓝KN-R的降解率为75.30%;Ti掺杂量为4%(4Ti/Bi2O3),4Ti/Bi2O3对活性艳蓝KN-R的降解效果最好,降解率可达93.27%。当4Ti/Bi2O3重复使用4次时,活性艳蓝KN-R的降解率仅降低了6.91%。掺杂Ti可以抑制Bi2O3晶粒的生长,使Ti/Bi2O3材料的XRD峰变宽。纯Bi2O3颗粒较大且表面光滑。随着Ti掺杂量的增加,Ti/Bi2O3材料的表面从粗糙生长到纳米纤维Bi4Ti3O12。掺杂Ti离子显著提高了Bi2O3的可见光吸收性能和电子分离转移能力。带隙从2.81eV减小到2.75eV。总之,Ti掺杂增强了Bi2O3的可见光吸收和电子分离转移能力,并改善了表面形貌,这使得Bi2O3具有更高的光催化性能。
In this study, different compositions of Ti-doped Bi2O3 photocatalytic materials were prepared by chemical solution decomposition method. It was used to degrade reactive brilliant blue KN-R, and then characterized by XRD, SEM, UV-vis DRS, XPS, photocurrent, and other detection methods. The results show that when the catalyst dosage is 1.0 g/L and the initial concentration of reactive brilliant blue KN-R is 20 mg/L, the degradation rate of pure Bi2O3 to reactive brilliant blue KN-R is 75.30%; the Ti doping amount is 4% (4Ti/Bi2O3), 4Ti/Bi2O3 had the best degradation effect on reactive brilliant blue KN-R, and the degradation rate could reach 93.27%. When 4Ti/Bi2O3 was reused for 4 times, the degradation rate of reactive brilliant blue KN-R only decreased by 6.91%. Doping Ti can inhibit the growth of Bi2O3 grains, making the XRD peak of Ti/Bi2O3 material wider. The pure Bi2O3 particles are larger and the surface is smooth. With the increase of Ti doping content, the surface of Ti/Bi2O3 material grows from roughness to nanofibrous Bi4Ti3O12. The visible light absorption performance and electron separation and transfer ability of Bi2O3 are significantly improved by doping Ti ions. The band gap is reduced from 2.81 to 2.75 eV. In conclusion, doping Ti enhances the visible light absorption and electron separation and transfer capabilities of Bi2O3, reduces the band gap, and improves the surface morphology, which makes Bi2O3 have higher photocatalytic performance.