TỔNG HỢP, NGHIÊN CỨU ĐẶC TRƯNG CẤU TRÚC VÀ HOẠT TÍNH QUANG XÚC TÁC CỦA OXIT NANO ZnO CĨ PHA TẠP Sr2+ PREPARATION, CHARACTERIZATION AND PHOTOCATALYTIC ACTIVITY OF SR-DOPED ZINC OXIDE NANOPARTICLES Nguyễn Thị Tố Loan1, Nguyễn Quang Hải1, Nguyễn Thị Thúy Hằng2 Trường Đại học Sư phạm Thái Nguyên Trường Đại học Kĩ thuật Công nghiệp Thái Nguyên Ngày đến Toà soạn: Abstract Sr2+-doped Zinc oxide nanoparticles with different Sr contents have been synthesized by the gel combustion method using poly (vinyl alcohol) (PVA) The structures, morphology, optical activity and photocatalytic property of Sr 2+-doped ZnO samples were investigated by X-ray diffraction (XRD), Transmission Electron Microscopy (TEM), Energy Dispersive X-ray analysis (EDX), UV-Visible When increasing the concentration of Sr, the average size of nanoparticles regularly decreased from 34.3 nm to 23.2 nm and the band gap of ZnO nanoparticles evaluated by the linear fitting linearly decreased from 3.1 to 2.3 eV Additionally, the photocatalytic activity of both undoped and doped samples increased via the increase of Sr content, which was investigated by using methylene blue dye under ultraviolet lights The results show that the photocatalytic activity of Sr 2+ doped ZnO was much higher than that of pure ZnO Keywords Sr2+ doped Zinc Oxide, Nanoparticles, gel combustions, PVA, photocatalytic activity MỞ ĐẦU Ngày phát triển nhiều chiếm phần nhỏ ngành công nghiệp, nguồn nước ánh sáng mặt trời (