Iron-substituted SBA-15 microparticles: a peroxidase-like catalyst for H2O2 detection

In this communication, we demonstrate our recent finding that iron-substituted SBA-15 (Fe-SBA-15) microparticles possess intrinsic peroxidase-like activity and can catalyze the oxidation of peroxidase substrate 3,3',5,5'-tetramethylbenzidine (TMB) by H2O2 to develop a blue color in aqueous solution, leading to a simple approach towards colorimetric detection of H2O2 with a linear detection range from 0.4 mu M to 15 mu M (r = 0.997) and a detection limit of 0.2 mu M.