Er掺杂纳米ZnO的制备及紫外光催化降解罗丹明B

摘要

Er-doped ZnO nanoparticles (Er-ZnO) were synthesized by ultrasonic assisted method. Their crystal structures were characterized by XRD, FT-IR and SEM, and their photocatalytic activity toward the degradation of Rhodamine B was studied. The results show that the Er-ZnO crystal particles possess hexagonal wurtzite structures with a particle size of 16–30 nm, which self-assemble into bigger spindle porous particles. Furthermore, the 0.2% (mass fraction) Er-doped ZnO calcinated at 700℃ for 4.5 h exhibits the highest photocatalytic ability, and the degradation rate of sample to Rhodamine B solution (0.02 g•L–1, the initial pH is 9) reaches 73.7% under UV irradiation for 3 h at room temperature.%用超声辅助合成法制备了掺Er的纳米ZnO颗粒（Er-ZnO）；利用XRD、FT-IR和SEM对所制Er-ZnO的物相组成和形貌进行了分析；考察了Er-ZnO对罗丹明B溶液的光催化性能。结果表明：所制备的Er-ZnO具有六边纤锌矿的晶体特征，且以粒径16~30 nm微小晶粒聚集成梭形多孔大颗粒。经700℃下煅烧4.5 h，掺Er量为质量分数0.2%的Er-ZnO具有最强光催化降解能力，在室温下紫外光照3 h，其对0.02 g·L–1的罗丹明B溶液（初始pH≈9）的降解率达73.7%。