Cao Yujuan,Wu Wei,Wang Song,Peng Hong,Hu Xiaogang,Yu Ying
Rapid and sensitive detection of heavy-metal ions in natural water environments worldwide is urgently needed because of their severe threats to human health. In the present work, monolayer graphite-like flake C 3 N 4 (g-C 3 N 4 ) materials were applied as a new fluorescent sensor for the detection of trace silver ion in aqueous solution. The thickness of synthesized g-C 3 N 4 was 0.45 nm and obtained by exfoliating twice with ultrasonic. With the presence of ethylene diamine tetraacetic acid as a screening agent, the highly sensitive sensor reached a low detection limit of 52.3 nmol/L for silver (I) ion and there was no disturbance when silver (I) ion coexisted with other metal ions in water samples. Under the optimal conditions, the monolayer g-C 3 N 4 was successfully used to detect trace silver (I) ion in different environmental water and drinking water samples.
Anye Shi,Huihui Li,Shu Yin,Bin Liu,Jiachi Zhang,Yuhua Wang
Single layer g-C 3 N 4 could be obtained from a protonic acid treatment of g-C 3 N 4 or a new sandwich-like orientation growth of melamine. Through the self-assembly of melamine and polyacrylamide by hydrogen bonds and electrostatic interactions, g-C 3 N 4 , with extended planarized atomic single layer, exhibits superiority in both photocatalytic hydrogen evolution and photocatalytic degradation under visible light irradiation. Besides low efficiency, the acid exfoliation will destroy the delocalized π-system by inducing O atoms. The decrease of conjugation degree increases the optical gaps, making it hard for g-C 3 N 4 to capture photons. On the contrary, the facile sandwich-like orientation growth of melamine highly keeps the conjugation degree of g-C 3 N 4 and extends its delocalized π-system. Such single layer g-C 3 N 4 is more active even better than N-doped TiO 2 under visible light irradiation.
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