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In suit inducing electron-donating and electron-withdrawing groups in carbon nitride by one-step NH4Cl-assisted route: A strategy for high solar hydrogen production efficiency

Author:
Huang, Zhaohui, Chen, Hui, Zhao, Lei, Fang, Wei, He, Xuan, Li, Weixin, Tian, Pan
Source:
Environment international 2019 v.126 pp. 289-297
ISSN:
0160-4120
Subject:
absorption, active sites, ammonium chloride, carbon nitride, hydrogen production, melamine, photocatalysis, polymers, porosity, semiconductors, surface area
Abstract:
Owing to insufficient active sites, strongly bound excitons and insufficient optical absorption, polymer semiconductors have only shown mild activity as potential candidates for photocatalysis. A g-C3N4 with improved optical absorption capacity, charge transfer performance and porosity was successfully prepared by a one-step NH4Cl-assisted route. Interaction of melamine with NH4Cl preparation of Porous g-C3N4(CN-xy) with active functional groups modified pore wall shown to result in highly crystalline species with a maximum π-π layer stacking distance of heptazine units of 0.321 nm, decreases the optical band gap from 2.80 to 2.13 eV and maximum surface area reached 56.485 m2 g−1. The balanced improvement of the multiple defects of g-C3N4 makes the photocatalytic degradation of RhB and the photocatalytic hydrogen production efficiency 4 and 5 times higher than the pristine g-C3N4, respectively.
Agid:
6333375