Facile two-step treatment of carbon nitride for preparation of highly efficient visible-light photocatalyst

Facile two-step treatment of carbon nitride for preparation of highly efficient visible-light photocatalyst
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氮化碳简便的两步处理制备高效可见光光催化剂

DOI:
10.1016/j.apcatb.2018.01.056
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发表时间:
2018-07
期刊:
Applied Catalysis B: Environmental
影响因子:
--
通讯作者:
Lin Dong
Lin Dong
中科院分区:
其他
文献类型:
--
作者:
Ningxin Jiang;Hongjia Wang;Yidan Luo;Shuohan Yu;Annai Liu;Weixin Zou;Fei Gao;Lin Dong

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对石墨化氮化碳(GCN)的微观结构进行调控是提高其光催化活性的有效途径。GCN的质子化研究已较为广泛,而碱改性GCN的研究较少。在此,我们报道了一种简单的两步水热煅烧法来改性GCN。经氨水水热处理和氩气气氛下煅烧后,GCN-xh-Ar(x为水热时间)样品对RhB的光催化降解和放氢性能有显著提高。GCN-2 h-Ar样品的析氢速率最高,为736 μmol h−1g−1,是原始GCN(67 μmol h−1g−1)的近11倍。样品的活性提高归因于更高的比表面积、更大的孔体积和更强的可见光吸收。这种方法揭示了高效光催化剂的合成。
Tailoring the microstructure of graphitic carbon nitride (GCN) is an effective way to improve its photocatalytic activities. Protonation of GCN has been extensively studied, while few researches focused on modifying GCN with alkali. Herein, we report a facile two-step hydrothermal-calcination method to modify GCN. After hydrothermal treatment with ammonia solution and subsequently calcination under argon atmosphere, the as-synthesized GCN-xh-Ar (x stands for hydrothermal time) samples exhibit drastically improved photocatalytic activities towards photocatalytic degradation of RhB and evolution of hydrogen. The GCN-2h-Ar sample shows the highest hydrogen evolution rate of 736 μmol h−1g−1, which is nearly 11 times of pristine GCN (67 μmol h−1g−1). The improved activities of samples can be attributed to the higher surface area, larger pore volume and enhanced visible light absorption. This approach sheds light on the synthesis of highly efficient photocatalysts.
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