Higher Yield Urea-Derived Polymeric Graphitic Carbon Nitride with Mesoporous Structure and Superior Visible-Light-Responsive Activity
Higher Yield Urea-Derived Polymeric Graphitic Carbon Nitride with Mesoporous Structure and Superior Visible-Light-Responsive Activity
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具有介孔结构和优异可见光响应活性的高产率尿素衍生聚合石墨碳氮化物
DOI：
10.1021/acssuschemeng.5b01139
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发表时间：
2015-12-01
影响因子：
8.4
通讯作者：
Sun, Jianmin
中科院分区：
文献类型：
--
作者：
Shi, Lei;Liang, Lin;Sun, Jianmin
以尿素和正硅酸乙酯(TEOS)为前驱体，制备了一系列介孔石墨化碳氮化物(MG-C3N4)材料，并将其进行热缩聚制得g-C3N4/SiO_2复合材料，去除SiO_2后，成功地制备出大比表面积(170 m~2·g~(-1))的Mg-C_3N_4。令人兴奋的是，TEOS不仅起到介孔导向剂的作用，而且还能促进尿素缩聚为g-C3N4，使缩聚反应在较低的温度下进行。从而减少了尿素在热处理过程中的挥发和分解，使g-C3N4的产品收率从0.3 g/10g尿素显著提高到1.2g/10g尿素。此外，在Mg-C3N4光催化剂上表现出了较好的光催化降解甲基橙(MO)和裂解水制氢的活性。以经济实惠的尿素为原料制备高产率介孔g-C3N4的方法更具吸引力.
A series of mesoporous graphitic carbon nitride (mg-C3N4) materials have been prepared with urea and tetraethylorthosilicate (TEOS) as the precursors, which were thermally polycondensed to obtain the g-C3N4/silica composites, after silica was removed, mg-C3N4 with large surface area (170 m2 g–1) was successfully prepared. Excitingly, TEOS did not only act as a mesoporous-directing agent but also as the promoter for the urea polycondensation to g-C3N4, which made the urea polycondensation proceed at relatively low temperature. Thus, volatilization or/and decomposition of urea in the process of thermal treatment were reduced, resulting in the product yield of g-C3N4 from 0.3 to 0.4 g/10 g urea remarkably increasing to 1.2 g/10 g urea. Moreover, superior photocatalytic activities were observed for degrading methyl orange (MO) and H2 generation from water splitting over the mg-C3N4 photocatalyst. The facilely developed method for high-yield mesoporous g-C3N4 from cost-effective urea was more attractive for it...