Heterostructured boron doped nanodiamonds@g-C3N4 nanocomposites with enhanced photocatalytic capability under visible light irradiation
Heterostructured boron doped nanodiamonds@g-C3N4 nanocomposites with enhanced photocatalytic capability under visible light irradiation
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异质结构硼掺杂纳米金刚石@g-C3N4纳米复合材料在可见光照射下具有增强的光催化能力
DOI：
10.1016/j.ijhydene.2019.05.135
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发表时间：
2019-07
影响因子：
7.2
通讯作者：
Shan Chong Xin
中科院分区：
文献类型：
--
作者：
Su Li Xia;Liu Zhi Yu;Ye Yang Li;Shen Cheng Long;Lou Qing;Shan Chong Xin
硼掺杂的纳米金刚石（BDND）与石墨碳氮化物（g-C3 N4）纳米片耦合，以形成异质结通过一个简单的热解方法。BDND@ g-C3 N4异质结具有更强的可见光吸收、更高的电荷产生/分离效率和更长的载流子寿命，从而提高了其在可见光下的光催化活性。BDND@ g-C3 N4异质结在420 nm处的最佳H2释放速率和表观量子效率分别为96.3 μmol h− 1和6.91%，比原始g-C3 N4纳米片（18.2 μmol h− 1和3.92%）高出约5倍和2倍。由于BDND@ g-C3 N4复合材料的高光稳定性，在循环实验中没有观察到明显的产氢速率下降。BDND@ g-C3 N4结构的有机污染物降解动力学速率常数为0.1075 min−1，是原始g-C3 N4的3倍。该研究为构建高效的非金属光催化剂提供了一条新的途径。
Boron doped nanodiamonds (BDND) were coupled with graphitic carbon nitride (g-C3N4) nanosheets to form a heterojunction via a facile pyrolysis approach. The BDND@g-C3N4heterojunction exhibits enhanced visible-light absorbance, improved charge generation/separation efficiency and prolonged lifetime of carriers, which lead to the enhanced photocatalytic activities for the hydrogen evolution and organic pollution under visible-light irradiation. The optimal H2evolution rate and apparent quantum efficiency at 420 nm of the BDND@g-C3N4heterojunction is 96.3 μmol h−1and 6.91%, which is about 5 and 2 times higher than those of pristine g-C3N4nanosheets (18.2 μmol h−1and 3.92%). No obvious decrease in hydrogen generation rate is observed in the recycling experiment due to the high photo-stabilization of the BDND@g-C3N4composite. The degradation kinetic rate constant of organic pollution of the BDND@g-C3N4structure is 0.1075 min−1, which is 3 times higher compared to pristine g-C3N4. This work may provide a promising route to construct highly efficient non-metal photocatalysts for hydrogen evolution and organic pollution degradation under visible light irradiation.
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