Highly efficient visible-light photocatalytic activity of graphitic carbon nitride prepared from melamine-thiourea molecular composite
Highly efficient visible-light photocatalytic activity of graphitic carbon nitride prepared from melamine-thiourea molecular composite
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三聚氰胺-硫脲分子复合材料制备石墨氮化碳的高效可见光催化活性
DOI：
10.1016/j.jece.2016.09.029
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发表时间：
2016-12
影响因子：
7.7
通讯作者：
Heqing Tang
中科院分区：
文献类型：
--
作者：
Yanlei Qin;Yaobin Ding;Heqing Tang
以三聚氰胺和硫脲为前驱体，制备了具有大比表面积和电子结构可调的g-C3N4纳米薄片。结果表明，g-C3N4(CNMT)的结构、形貌、光学性质和光催化活性可以通过改变复合前驱体中硫脲的摩尔分数来调节，其最佳比例为71%。优化后的g-C3N4纳米薄片(CNMT-71%)的比表面积为106.4×m2/g，是常规块体g-C3N4的3倍。在可见光照射下，碳纳米管-71%的光催化降解罗丹明B(RhB)的速率常数为0.04min−1，约为常规g-C3N4(0.007 min−1)的5.7倍。碳纳米管纳米结构的改善、比表面积的增加和光生电子-空穴对的分离是其光催化性能提高的主要原因。这与复合材料前驱体中的分子间氢键以及复合材料热缩聚过程中硫脲分解生成的气体促进了g-C3N4的热剥离密切相关。
A molecular composite of melamine and thiourea was prepared and used as a precursor to synthesize thin-layer g-C3N4nanosheets with large specific surface area and tunable electronic structures. It was found that the structure, morphology, optical properties and photocatalytic activity of the as-prepared g-C3N4(CNMT) could be tuned by varying the thiourea molar percentage in the composite precursor, which was optimized at 71%. The optimized thin-layer g-C3N4nanosheets (CNMT-71%) had a specific surface area of 106.4 m2/g, being 3 times that of conventional bulk g-C3N4. Under visible light irradiation, the use of CNMT-71% achieved a complete photocatalytic degradation of rhodamine B (RhB) in 90 min with a rate constant of 0.04 min−1, which was about 5.7 times that of the conventional g-C3N4(0.007 min−1). The enhanced photocatalytic performance of CNMT was attributed to its improved nano-structure, increased specific surface area, and improved separation of photo-generated electron-hole pairs. All of these were closely related to the inter-molecular hydrogen bonding in the composite precursor and the thermal exfoliation of g-C3N4being enhanced by in situ generated gas from the decomposition of thiourea during the thermal polycondensation of the composite.
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