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Efficiently harvesting the ultrasonic vibration energy of two-dimensional graphitic carbon nitride for piezocatalytic degradation of dichlorophenols
Environmental Science: Nano ( IF 5.8 ) Pub Date : 2021-4-1 , DOI: 10.1039/d0en01028f Hua Lei 1, 2, 3, 4, 5 , Meixuan Wu 1, 2, 3, 4, 5 , Fan Mo 1, 2, 3, 4, 5 , Shilong Ji 1, 2, 3, 4, 5 , Xiaoping Dong 1, 2, 3, 4, 5 , Yanmin Jia 5, 6, 7, 8 , Feifei Wang 5, 9, 10, 11, 12 , Zheng Wu 13, 14, 15, 16, 17
Environmental Science: Nano ( IF 5.8 ) Pub Date : 2021-4-1 , DOI: 10.1039/d0en01028f Hua Lei 1, 2, 3, 4, 5 , Meixuan Wu 1, 2, 3, 4, 5 , Fan Mo 1, 2, 3, 4, 5 , Shilong Ji 1, 2, 3, 4, 5 , Xiaoping Dong 1, 2, 3, 4, 5 , Yanmin Jia 5, 6, 7, 8 , Feifei Wang 5, 9, 10, 11, 12 , Zheng Wu 13, 14, 15, 16, 17
Affiliation
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Mechanical energy harvesting by piezoelectric materials to drive catalysis reactions has recently received extensive attention for fuel production and environmental remediation. It has been well known that some two-dimensional (2D) ultrathin structures which are not piezoelectric in bulk become intrinsically piezoelectric because of the loss of centrosymmetry. In this work, we synthesized a nanosheet-like 2D g-C3N4 catalyst with a thickness of 3–5 nm that showed a significant piezoelectric response. The ultrasound-vibration-induced interior piezoelectric field drove electrons and holes to migrate in opposite directions towards the surface of nanosheets, leading to the formation of active species. This 2D g-C3N4 presented excellent piezocatalytic performance for the degradation of dichlorophenols, and the decomposition efficiency for 2,4-dichlorophenol (2,4-DCP), 2,5-dichlorophenol (2,5-DCP) and 2,6-dichlorophenol (2,6-DCP) reached 98.5%, 85.5%, and 72.1%, respectively, after a 150 min ultrasonic treatment. Furthermore, the good stability and reusability of the 2D g-C3N4 were demonstrated, and a possible degradation pathway was proposed based on the determined intermediates. The findings in this work clearly reveal that the metal-free 2D g-C3N4 should be a promising catalyst to efficiently remove organic pollutants from the environment.
中文翻译：
有效地收集二维石墨碳氮化物的超声振动能，以压电催化降解二氯苯酚
通过压电材料来驱动催化反应的机械能收集最近在燃料生产和环境修复方面受到了广泛的关注。众所周知，由于中心对称性的损失，一些不是压电体的二维（2D）超薄结构本质上变成了压电体。在这项工作中，我们合成了纳米片状2D gC 3 N 4催化剂，其厚度为3-5 nm，表现出显着的压电响应。超声振动引起的内部压电场带动电子和空穴以相反的方向向纳米片的表面迁移，从而导致活性物质的形成。这个2D gC 3 N 4在二氯苯酚的降解方面表现出优异的压电催化性能，以及2,4-二氯苯酚（2,4-DCP），2,5-二氯苯酚（2,5-DCP）和2,6-二氯苯酚（2,6）的分解效率-DCP）在150分钟的超声处理后分别达到98.5％，85.5％和72.1％。此外，证明了2D gC 3 N 4的良好稳定性和可重复使用性，并基于所确定的中间体提出了可能的降解途径。这项工作中的发现清楚地表明，不含金属的2D gC 3 N 4应该是从环境中有效去除有机污染物的有前途的催化剂。
更新日期：2021-04-20
中文翻译：
有效地收集二维石墨碳氮化物的超声振动能，以压电催化降解二氯苯酚
通过压电材料来驱动催化反应的机械能收集最近在燃料生产和环境修复方面受到了广泛的关注。众所周知，由于中心对称性的损失，一些不是压电体的二维（2D）超薄结构本质上变成了压电体。在这项工作中，我们合成了纳米片状2D gC 3 N 4催化剂，其厚度为3-5 nm，表现出显着的压电响应。超声振动引起的内部压电场带动电子和空穴以相反的方向向纳米片的表面迁移，从而导致活性物质的形成。这个2D gC 3 N 4在二氯苯酚的降解方面表现出优异的压电催化性能，以及2,4-二氯苯酚（2,4-DCP），2,5-二氯苯酚（2,5-DCP）和2,6-二氯苯酚（2,6）的分解效率-DCP）在150分钟的超声处理后分别达到98.5％，85.5％和72.1％。此外，证明了2D gC 3 N 4的良好稳定性和可重复使用性，并基于所确定的中间体提出了可能的降解途径。这项工作中的发现清楚地表明，不含金属的2D gC 3 N 4应该是从环境中有效去除有机污染物的有前途的催化剂。
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