Resource utilization of field acid mine drainage: Formation of layered double hydroxides, its removal capacity and mechanism for antimony

•A resource utilization approach of field AMD for the formation of LDHs was proposed.•LDHs derived from field AMD possesses a larger removal capacity for Sb compared with other LDHs from chemical reagents.•Sb(V) removal by LDHs was attributed to anion exchange and formation of brandholzite.•The removal mechanism of Sb by LDHs was revealed by DFT calculations.