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2D/2D g-C3N4/MnO2 Nanocomposite as a Direct Z-Scheme Photocatalyst for Enhanced Photocatalytic Activity
ACS Sustainable Chemistry & Engineering ( IF 8.4 ) Pub Date : 2017-11-17 00:00:00 , DOI: 10.1021/acssuschemeng.7b03289
Pengfei Xia 1 , Bicheng Zhu 1 , Bei Cheng 1 , Jiaguo Yu 1, 2 , Jingsan Xu 3
Affiliation  

Constructing two-dimensional (2D) composites using layered materials is considered to be an effective approach to achieve high-efficiency photocatalysts. Herein, a 2D/2D g-C3N4/MnO2 heterostructured photocatalyst was synthesized via in situ growth of MnO2 nanosheets on the surface of g-C3N4 nanolayers using a wet-chemical method. The hybrid nanomaterial was characterized by a range of techniques to study its micromorphology, structure, chemical composition/states, and so on. The g-C3N4/MnO2 nanocomposite exhibited greatly improved photocatalytic activities for dye degradation and phenol removal in comparison to the single g-C3N4 or MnO2 component. On the basis of the electron paramagnetic resonance spectra, X-ray photoelectron spectra, and the Mott–Schottky measurements, we consider that a Z-scheme heterojunction was generated between the g-C3N4 nanosheets and MnO2 nanosheets, wherein the photoinduced electrons in MnO2 combined with the holes in g-C3N4, leading to enhanced charge carrier extraction and utilization upon photoexcitation. This work provides an effective approach to construct the 2D/2D heterojunctions for the application in solar-to-fuel conversion and photocatalytic water treatment.

中文翻译:

2D / 2D gC 3 N 4 / MnO 2纳米复合材料作为直接Z方案光催化剂,具有增强的光催化活性

使用分层材料构造二维(2D)复合材料被认为是实现高效光催化剂的有效方法。在此,通过使用湿化学方法在gC 3 N 4纳米层的表面上原位生长MnO 2纳米片来合成2D / 2D gC 3 N 4 / MnO 2异质结构光催化剂。杂化纳米材料的特征在于研究其微观形态,结构,化学组成/状态等多种技术。gC 3 N 4 / MnO 2与单一的gC 3 N 4或MnO 2组分相比,纳米复合材料对染料的降解和苯酚的去除显示出大大提高的光催化活性。根据电子顺磁共振光谱,X射线光电子能谱和Mott–Schottky测量,我们认为在gC 3 N 4纳米片和MnO 2纳米片之间产生了Z型异质结,其中光诱导的电子在MnO 2与gC 3 N 4中的孔结合,从而增强了光激发后电荷载流子的提取和利用。这项工作为构造2D / 2D异质结提供了一种有效的方法,以用于太阳能到燃料的转化和光催化水处理中。
更新日期:2017-11-19
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