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以Ti(SO4)2为钛源和硫源,尿素为沉淀剂,采用均相沉淀法制备了S掺杂TiO_2纳米粉体。采用X射线衍射(XRD)、热重差热(TG-DTA)、傅里叶变换红外光谱(FT-IR)、透射电子显微镜(TEM)及能量弥散X射线能谱(EDS)等测试手段对其进行了表征,以亚甲基蓝为模拟污染物,评价了不同煅烧温度的粉体在可见光下的光催化活性。结果表明:制得的粉体颗粒粒径约为20 nm,颗粒大小均匀;掺杂硫取代了TiO_2中的晶格氧形成Ti-O-S键,硫含量约为0.1%(原子分数);350~600℃煅烧温度下的粉体均为锐钛矿型,且随着煅烧温度的升高,晶粒发育愈趋完整;S掺杂TiO_2纳米粉体具有较高的可见光催化活性,18 W白色荧光灯照射下,550℃煅烧样品对亚甲基蓝在2 h时降解率达80.67%。
S-doped TiO 2 nanopowders were prepared by homogeneous precipitation method using Ti (SO 4) 2 as titanium source, sulfur source and urea as precipitating agent. (XRD), TG-DTA, Fourier transform infrared spectroscopy (FT-IR), transmission electron microscopy (TEM) and energy dispersive X-ray spectroscopy (EDS) It was characterized using methylene blue as a simulated pollutant to evaluate the photocatalytic activity of the powders at different calcination temperatures under visible light. The results show that the particle size of the obtained powder is about 20 nm and the particle size is uniform. The doping sulfur substitutes the lattice oxygen in TiO_2 to form Ti-OS bond with the sulfur content of about 0.1% (atom fraction) The powders at 600 ℃ calcined temperature are anatase, and the grain growth is more and more complete with the increase of calcination temperature. The S-doped TiO_2 nanopowder has high visible light catalytic activity and 18 W white fluorescent lamp Under irradiation, the degradation rate of methylene blue at 550 ℃ for 2 h was 80.67%.