Tuning and thermal exfoliation graphene-like carbon nitride nanosheets for superior photocatalytic activity
Tuning and thermal exfoliation graphene-like carbon nitride nanosheets for superior photocatalytic activity
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DOI：
10.1016/j.ceramint.2016.08.190
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发表时间：
2016-12-01
影响因子：
5.2
通讯作者：
Pu, Shihua
中科院分区：
文献类型：
--
作者：
Li, Yanan;Wang, Min-Qiang;Pu, Shihua
在这项工作中，通过简单有效的热剥离块状 g-C3N4 合成了具有丰富纳米孔和优异亲水特性的超薄石墨烯类氮化碳纳米片。为了充分了解热剥离条件对所得g-C3N4的织构、表面状态和光催化活性的影响，通过调节热剥离温度和时间制备了一系列剥离的g-C3N4。详细的表征和分析清楚地表明，升高剥离温度导致大量的氮空位和增加的比表面积，进一步延长了剥离时间，增强了热剥离程度，在所得产品中形成了更多的碳空位和扩大的孔体积。此外，通过增加热剥离温度和时间，所得产品的剥离程度和光催化能力得到增强。优化后的超薄类石墨烯氮化碳纳米片仅在10分钟内就表现出了89.6%的Rh6G降解效率，这比之前文献报道的其他此类纳米片要快得多。 (C) 2016 Elsevier Ltd 和 Techna Group S.r.l.版权所有。
In this work, ultrathin graphene-like carbon nitride nanosheets with rich nanoporous and excellent hydrophilic characteristics were synthesized by a simple and effective thermal exfoliation of bulk g-C3N4. In order to fully understand the effect of thermal exfoliation conditions on the texture, surface state, and photocatalytic activity of the resulting g-C3N4, a series of exfoliated g-C3N4 were prepared by adjusting the thermal exfoliation temperature and time. The detailed characterization and analysis distinctly suggested that increasing exfoliation temperature led to a large number of nitrogen vacancies and increased specific surface area, further prolonging exfoliation time, the thermal exfoliation degree was enhanced, more carbon vacancies and enlarged pore volume formed in the resulting products. Further, the exfoliation degree and photocatalytic ability of the resultant products were enhanced by increasing thermal exfoliation temperature and time. The optimized ultrathin graphene-like carbon nitride nanosheets exhibited a 89.6% degradation efficiency for Rh6G only in 10 min, which was much faster than other such nanosheets reported in previous literature. (C) 2016 Elsevier Ltd and Techna Group S.r.l. All rights reserved.