Removal of iopromide and degradation characteristics in electron beam irradiation process

► The second-order kinetic was fitted in overall removal tendency of iopromide. ► In the electron beam/H2O2 process, enhanced removal rate of iopromide was observed. ► The iopromide removal rate increased in the presence of OH scavengers. ► The mineralization was mainly performed in the electron beam/H2O2 condition. ► The eaq− mainly attacks the iodo-group, whereas the OH reacts non-selectively.