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Triamterene‐Grafted Graphitic Carbon Nitride with Electronic Potential Redistribution for Efficient Photocatalytic Hydrogen Evolution
Author(s) -
Sun Miao,
Li Kui,
Zhang WeiDe,
Yu YuXiang
Publication year - 2018
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.201801083
Subject(s) - photocatalysis , redistribution (election) , photochemistry , graphitic carbon nitride , triamterene , chemistry , charge carrier , materials science , organic chemistry , catalysis , optoelectronics , medicine , politics , political science , blood pressure , law , hydrochlorothiazide , radiology
In this study, a photocatalyst with a distorted skeleton and synthesized by grafting triamterene onto graphitic carbon nitride (g‐C 3 N 4 ) frameworks was prepared. The pteridine ring of the triamterene‐based nitrogen‐enriched organic structure functions as a trapped electron site owing to its inductive effect. The benzene ring in triamterene plays an important role in the even dispersion of electrons by a conjugative effect. Redistribution of the intramolecular electronic potential is caused by a synergistic effect between the pteridine and benzene rings of triamterene and promotes separation and migration of the photoinduced charge carriers. After coupling with triamterene, the π electrons of g‐C 3 N 4 are relocated; that is, the intrinsic electronic and band structures of g‐C 3 N 4 are effectively modulated. The modified polymeric photocatalyst shows a high photocatalytic H 2 evolution rate of 157.5 μmol h −1 , a value that is 4.3 times higher than the H 2 evolution rate of pristine g‐C 3 N 4 (36.8 μmol h −1 ), with an apparent quantum efficiency of 9.7 % at λ =450 nm. The incorporation of triamterene into the g‐C 3 N 4 frameworks significantly expands its π‐delocalized system by redistribution of the electronic potential, expands the visible‐light absorption range, and effectively promotes the separation and migration of photoinduced charge carriers. This strategy may provide a reference for promoting charge separation of g‐C 3 N 4 through redistribution of the electronic potential and for synthesizing novel carbon nitride based semiconductors for efficient solar energy conversion into hydrogen.