▎ 摘　　要

The photoluminescence of graphene oxide quantum dots (GOQDs) is known to be quenched by metal ions. In this paper, this quenching effect has been found to be strengthened with the increase of environmental pH, which would introduce hydroxyl group for GOQDs because other kinds of functional groups have the trend to evolve towards hydroxyl with increasing pH. Thus, a pH-dependent fluorescent quenching of GOQDs can be obtained, which might further guide the metal ion detection of GOQDs in a practical application.