学术论文

      富碳类石墨相氮化碳的制备及光催化性能

      Construction of carbon-rich g-C3N4 and its photocatalytic performance

      摘要:
      丙三醇与三聚氰胺的混合物通过热聚合法制得富碳类石墨相氮化碳(g-C3N4),着重研究丙三醇加入量对样品光催化性能的影响.采用X线衍射仪(XRD)、傅里叶红外光谱仪(FT-IR)、透射电子显微镜(TEM)分析样品的晶体结构、化学组成和形貌,紫外-可见分光光度计(UV-Vis)测定样品的光谱吸收性能,荧光光谱仪(PL)测试样品的荧光性能.结果表明:三聚氰胺缩聚形成g-C3N4,丙三醇碳化形成的无定形碳负载于g-C3N4表面.无定形碳的引入可以有效促进g-C3N4的可见光吸收,丙三醇的最佳加入量为0.2%(质量分数),此富碳g-C3N4样品可在200 min内降解90%的RhB,是纯g-C3N4降解量的1.4倍.样品具有较好的稳定性,4次循环实验后依然保持92%以上的反应活性.
      Abstract:
      Carbon-rich g-C3N4 was obtained by heating the mixture of melamine and glycerol.The photocatalytic performance of the samples was regulated by the amount of glycerol.The crystal structure,chemical composition,and morphology were analyzed by X-ray diffraction (XRD),Fourier transform infrared spectroscopy (FT-IR),and transmission electron microscope (TEM).Ultraviolet-visible spectrophotometer(UV-Vis) and photoluminescence spectroscopy(PL)were employed to confirm the optical properties of the samples.A morphous carbon was derived from the carbonization of glycerolduring the condensation of melamine.The introduction of carbon could promote the visible light absorption of the photocatalysts,which was favorable for the enhancement of photocatalytic activity.The optimum amount of glycerol was 0.2% (mass fraction).90% of rhodamine B (RhB) could be degraded by 0.2%carbon-rich g-C3N4 in 200 min,which was 1.4 times of pure g-C3N4.The repeated experiments demonstrated that the photocatalytic activity of 0.2% carbon-rich g-C3N4 had well stability.The photocatalytic performance could be maintained as high as 92% after 4 cycles.
      Author: SUN Weihua LU Chunhua KOU Jiahui NI Yaru XU Zhongzi
      作者单位: 南京工业大学 材料科学与工程学院,江苏南京,210009
      年,卷(期): 2017, 39(2)
      分类号: TB33
      在线出版日期: 2017年5月16日
      基金项目: 国家自然科学基金,江苏省高校自然科学研究重大项目,江苏省自然科学基金