Abstract

In this paper, two modification strategies were introduced in g-C3N4 system to improve its photocatalytic activity. In detail, mesoporous g-C3N4 with cyano-group was successfully synthesized. Its chemical structure and states, specific surface area, optical absorption, photo-electrochemical properties and photocatalytic ability for hydrogen evolution were characterized. It was indicated that mesoporous g-C3N4 with cyano-group photocatalyst exhibited better charge separation rate, and the higher photocurrent intensity, For hydrogen evolution, it achieved the higher hydrogen evolution rate of 4531 μmol·h−1 g−1, which was 3 folds that of mesoporous g-C3N4 and 13 folds that of bulk g-C3N4, and kept excellent stability. Obviously, current work shed light for developing high efficient photocatalysts by combining multiple modification.

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