Abstract:In this study, we synthesized modified attapulgite-Fe nano composite material(A-NZVI)using the liquid-phase reduction method, and investigated the stability of A-NZVI and changes of three kinds of nitrogen(NO3--N, NH4+-N, and NO2--N)in the reaction process. We also analyzed the effects of groundwater environmental factors(dissolved oxygen, temperature, and light)on the removal of NO3--N with A-NZVI. In the simulation of groundwater environment, the three kinds of materials were ranked in the following descending order according to their reactivity in removing NO3--N: A-NZVI, nanoscale zero-valent iron, and modified attapulgite. The conversion rate of NH4+-N was low, with nearly no NO2--N generated, when using A-NZVI. Dissolved oxygen and temperature had significant influence on the removal of NO3--N from groundwater with A-NZVI. When in the light and dark environment, the removal rate of NO3--N and the amounts of generated NH4+-N and NO2--N had no significant difference. The findings of the study provided a theoretical basis and technical support for restoration projects for groundwater with NO3--N pollution.