▎ 摘　　要

Brominated graphene (GBR) with-,3% bromine content has shown novel peroxidase mimetic activity toward.3,3',5,5'-tetramethylbenzidine (TMB) in the presence of H2O2. Optimum activity has been observed at pH 4.48 and after a minimum similar to 30 min of equilibration time. Among the different analVtes studied using the sensor combining TMB,. H2O2, and GBR in phosphate buffer of pH 4.48, the S2- ion has effectively shown a short duration of sensing (similar to 2 min) within the detection range of 0.04-1 m.M. A calibration curve for S2- ion estimation has been constructed with the experimental linearity in 0.04-0.4 mM range and having the limit of detection (LOD) value of 25.3 mu M. A standard addition experiment has validated the method. A paper strip sensor has been fabricated for successful detection of S2- ion.