Developing an effective photocatalytic denitrification technology for NO3 and NO2 in water is urgently needed. In this paper, we synthesized a nitrogen-rich g-C3N4, and in-situ grown AgPd nanowires (NWs) on the surface of nitrogen-rich g-C3N4 to build AgyPd10 (y)/g-CxN4 Mott-Schottky heterojunction. Compared with g-CxN4, AgyPd10 (y)/g-CxN4 exhibits the enhanced photocatalytic hydrogen production from water and tandem reduction of NO3 and NO2 without the addition of other hydrogen source under 365 nm irradiation. The catalytic activity and selectivity of AgyPd10 (y)/g-CxN4 were studied by combination of the nitrogen-rich g-C3N4 and the different component of AgyPd10 (y) nanowires (NWs). Among the AgyPo10 y/g-CxN4 catalyst, the Ag3Pd7/g-C1.95N4 catalyst exhibited the highest photocatalytic activity and selectivity for photocatalytic reduction of NO3 and NO2, and the removal rate of NO3 and NO2 are 87.4% and 61.8% under 365 nm irradiation at 25 degrees C, respectively. The strategy opens a new way for making the photocatalytic hydrogen production in tandem with reduction of NO3 and NO2 in water, also extending it to remove metal ion. (C) 2020 Elsevier Inc. All rights reserved.