Fig. 2From: Porphyrin Iron-Grafted Mesoporous Silica Composites for Drug Delivery, Dye Degradation and Colorimetric Detection of Hydrogen Peroxidea The UV–vis absorbance change of FeIX-SBA-15 mixed with TMB and H2O2. b Photographs of solutions containing TMB, H2O2, and FeIX-SBA-15 at different time. The linear calibration plot of H2O2 in solution (c) and on FeIX-SBA-15 modified membrane (d)Back to article page