Nitrogen-rich g-C3N4@AgPd Mott-Schottky heterojunction boosts photocatalytic hydrogen production from water and tandem reduction of NO3− and NO2−.

Developing an effective photocatalytic denitrification technology for NO 3 − and NO 2 − in water is urgently needed. In this paper, we synthesized a nitrogen-rich g-C 3 N 4 , and in-situ grown AgPd nanowires (NWs) on the surface of nitrogen-rich g-C 3 N 4 to build Ag y Pd 10−y /g-C x N 4 Mott-Schottky heterojunction. Compared with g-C x N 4 , Ag y Pd 10−y /g-C x N 4 exhibits the enhanced photocatalytic hydrogen production from water and tandem reduction of NO 3 − and NO 2 − without the addition of other hydrogen source under 365 nm irradiation. The catalytic activity and selectivity of Ag y Pd 10−y /g-C x N 4 were studied by combination of the nitrogen-rich g-C 3 N 4 and the different component of Ag y Pd 10−y nanowires (NWs). Among the Ag y Pd 10−y /g-C x N 4 catalyst, the Ag 3 Pd 7 /g-C 1.95 N 4 catalyst exhibited the highest photocatalytic activity and selectivity for photocatalytic reduction of NO 3 − and NO 2 −, and the removal rate of NO 3 − and NO 2 − are 87.4% and 61.8% under 365 nm irradiation at 25 °C, respectively. The strategy opens a new way for making the photocatalytic hydrogen production in tandem with reduction of NO 3 − and NO 2 − in water, also extending it to remove metal ion. [ABSTRACT FROM AUTHOR]