▎ 摘　　要

With the social and economic development, environmental pollution issues have gradually become a serious threat to ecosystem. Therefore, effective detection methods of environmental pollutants have been widely expanded. In this study, an electrochemical sensor based on a functioned graphene was constructed. The functional graphene was obtained by electrochemical deposition of L-cysteine on graphene oxide modified glassy carbon electrode. The composite on the modified glassy carbon electrode was characterized by scanning electron microscopy, transmission electron microscopy and X-ray photoelectron spectroscopy. The characterized results discovered that graphene oxide was reduced and cross-linked to L-Cys simultaneously, with a corrugated sheet structure. The electrochemical behavior of the electrode was investigated by electrochemical impedance spectroscopy and cyclic voltammetry, and proved that the electrode has a rapid transfer of electrons and a good catalytic effect on environmental pollutant of hydroquinone. The constructed electrode can be used to detect hydroquinone, with the detection limit of 1.5 mu M (S/N = 3), and a good linear relationship in the range of 2-160 mu M. The low relative standard deviation of identical sensors and good anti-interference for coexisting matters revealed that the sensor has an important theoretical significance and broad application prospect.