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Received:September 30, 2015
Received:September 30, 2015
中文摘要: 利用马弗炉在空气氛围下高温分解尿素制备具有高效可见光催化活性的类石墨烯g-C3N4光催化剂.利用X射线衍射（XRD）、扫描电子显微镜（SEM）、紫外-可见吸收光谱等手段对样品进行性能表征.研究结果表明，升温速率对所制备的g-C3N4的晶型结构有显著影响，在升温速率为2℃/min时，所制备的g-C3N4的XRD衍射峰与其标准衍射图谱相一致；保温时间长短对所制备的g-C3N4的XRD衍射峰产生影响，保温温度则对其影响不大；最佳的制备条件为升温速率2℃/min，500℃恒温5 h.光催化活性实验表明，所制备的光催化剂g-C3N4具有优异的可见光催化活性，在可见光辐射50 min条件下，罗丹明B的降解率可达90%.
中文关键词: g-C3N4光催化剂 尿素 可见光 催化性能
Abstract:Novel photocatalysts with visible-light-photocatalytic activity of g-C3N4 are prepared by directly heating urea in a muffle furnace.The photocatalysts are characterized by the powder X-ray diffraction,scanning electron microscopy and UV-vis diffuse reflectance spectroscopy.The results show that the crystal structure of the g-C3N4 photocatalysts can be well controlled by the heating rate.The XRD patterns of the prepared under 2℃/min heating rate are well matched with the standard pattern.The optimum synthesis condition is soaking heating 5 h at 500℃ under the 2℃/min heating rate.Photocatalytic activities of the samples are evaluated by the degradation of Rhodamine B (RhB) under visible light irradiation.The prepared g-C3N4 sample possesses photocatalytic activity and the degradation rate of RhB can reach about 90% under visible light irradiation 50 min.
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