Oxygen-containing groups and P doped porous carbon nitride nanosheets towards enhanced photocatalytic activity

光催化 纳米片 石墨氮化碳 罗丹明B 掺杂剂 氮化碳 氧气 反应速率常数 材料科学 兴奋剂 降级(电信) 多孔性 化学工程 化学 光化学 纳米技术 催化作用 动力学 有机化学 工程类 物理 电信 量子力学 光电子学 计算机科学
作者
Xiaohui Zhan,Yue Zhao,Gaoyan Zhou,Jiaxin Yu,He Wang,Huixiang Shi
出处
期刊:Chemosphere [Elsevier BV]
卷期号:287: 132399-132399 被引量:13
标识
DOI:10.1016/j.chemosphere.2021.132399
摘要

Metal-free polymer graphite carbon nitride (CN) is a promising photocatalyst that has garnered significant research attention. However, unmodified CN possesses several shortcomings such as low specific surface area, poor dispersibility in water, and rapid photogenerated electron-hole recombination, which have severely impacted its mass adoption. Here, this study proposed a two-step heat treatment method to incorporate P dopant and the containing-oxygen groups successively into CN. The final product, denoted as PO-CN, possessed a porous ultrathin nanosheet-like morphology. The introduction of P dopant altered the intrinsic electronic structure of CN. Meanwhile, the presence of oxygen-containing groups improved the dispersibility of PO-CN in water. Also, it led to the formation of a porous ultrathin structure that could provide more active sites. Through the synergistic effects of these two methods, PO-CN demonstrated superior photocatalytic performance compared to the unmodified counterpart. Based on the collective results obtained experimentally and theoretically, PO-CN possessed a porous ultrathin structure, low resistance, and low carrier recombination. The results show an optimal hydrogen evolution rate of PO-CN (997.7 mol h−1 g−1), which was 11.2 times and 3.22 times that of the CN (88.89 mol h−1 g−1) and PCN (310.3 mol h−1 g−1). Moreover, PO-CN was then used in the degradation of Rhodamine B, and a degradation kinetic constant (k) of 0.15009 was calculated, which was 18.42 times and 8.22 times higher as compared to those of CN (0.00815) and PCN (0.01826). Hence, this work provides a new strategy for the alteration of the morphology and electronic structure of CN.
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