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Plasma-exfoliated g-C_(3)N_(4) with oxygen doping: tailoring photocatalytic properties
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作者 Yuxin Li junxin guo +1 位作者 Rui Han Zhao Wang 《Frontiers of Chemical Science and Engineering》 SCIE EI CSCD 2024年第2期27-39,共13页
Heteroatom doping and defect engineering have been proposed as effective ways to modulate the energy band structure and improve the photocatalytic activity of g-C_(3)N_(4). In this work, ultrathin defective g-C_(3)N_(... Heteroatom doping and defect engineering have been proposed as effective ways to modulate the energy band structure and improve the photocatalytic activity of g-C_(3)N_(4). In this work, ultrathin defective g-C_(3)N_(4) was successfully prepared using cold plasma. Plasma exfoliation reduces the thickness of g-C_(3)N_(4) from 10 nm to 3 nm, while simultaneously introducing a large number of nitrogen defects and oxygen atoms into g-C_(3)N_(4). The amount of doped O was regulated by varying the time and power of the plasma treatment. Due to N vacancies, O atoms formed strong bonds with C atoms, resulting in O doping in g-C_(3)N_(4). The mechanism of plasma treatment involves oxygen etching and gas expansion. Photocatalytic experiments demonstrated that appropriate amount of O doping improved the photocatalytic degradation of rhodamine B compared with pure g-C_(3)N_(4). The introduction of O optimized the energy band structure and photoelectric properties of g-C_(3)N_(4). Active species trapping experiments revealed ·O_(2)^(–) as the main active species during the degradation. 展开更多
关键词 graphitic carbon nitride cold plasma oxygen doping nitrogen defect visible-light photocatalysis
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本征各向异性对地震波频散、衰减与频变各向异性的影响 被引量:6
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作者 郭俊鑫 曹呈浩 +1 位作者 陈晓非 廖建平 《科学通报》 EI CAS CSCD 北大核心 2023年第26期3491-3505,共15页
层间波致流体流动是饱和流体孔隙层状介质中地震波频散、衰减与频变各向异性的重要机制,目前已提出较多模型对其进行定量表征.然而,现有模型忽略了层状介质中各层本身可具有的各向异性特征(即本征各向异性).对此,本文基于Biot孔弹性理... 层间波致流体流动是饱和流体孔隙层状介质中地震波频散、衰减与频变各向异性的重要机制,目前已提出较多模型对其进行定量表征.然而,现有模型忽略了层状介质中各层本身可具有的各向异性特征(即本征各向异性).对此,本文基于Biot孔弹性理论推导了由横向各向同性饱和流体孔隙地层组成的层状介质中地震波频散、衰减与频变各向异性的近似理论模型.同时,为验证理论模型,开展了数值模拟与理论模型的对比,两者吻合良好.利用理论模型,分析了4种情况(流体性质不同、骨架性质不同及两者之间的两种不同组合)下本征各向异性的影响.结果表明,对于气层与水层交互形成的层状介质,含水层的本征各向异性对地震波的频散、衰减与频变各向异性影响最大,而对于含高孔薄层的层状介质,背景基质本征各向异性与流体分布起主要影响.本文构建的模型简洁易用,在页岩或致密砂岩等具有明显层理特征的储层中应用前景广阔. 展开更多
关键词 本征各向异性 波致流体流动 孔隙层状介质 地震频散与衰减 地震频变各向异性
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