Iron-doped carbon dots (Fe-CDs) were greenly synthesized via a one-step hydrothermal method using the eco-friendly materials milk powder and FeCl3. It was found that the synthesized biomass Fe-CDs have photoluminescence properties and strong mimetic oxidase activity, which enables catalysis of the oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) to produce a blue product, oxidized TMB (oxTMB). The presence of ascorbic acid (AA) could reduce the oxTMB and make the solution color lighter to realize the colorimetric determination of AA. In addi...
