The differences in heterogeneous Fenton catalytic performance and mechanism of various iron minerals and their influencing factors: A review

Controlled-Release Electrochemiluminescence Biosensor with Strong Self-On Effect by a Multiple Signal Amplification Strategy for Trace Detection of Prostate-Specific Antigen

“…Finally, L •– reacted with OH • to form AP 2– * to produce a remarkable ECL signal. Based on the relevant refs, ,,− the whole conjectural ECL mechanism is displayed in Figure B and the following equations. H 2 O 2 → OH • + OH − LH − + OH • → L • − + H 2 normalO Enhancement path 1 Ce 3 + + H 2 O 2 → Ce 4 + + OH • ( more ) + OH − Enhancement path 2 Fe 2 + + H 2 O 2 → Fe 3 + + OH • ( more ) + OH − ECL emission L • − + OH • → AP 2 − false* + N 2 AP 2 − false* ...…”

“…21 Fe 2+ and Ce 3+ reacted with H 2 O 2 to generate more OH • , which achieved outstanding ECL signal enhancement. 21,22 Overall, the multiple signal amplification strategy can enhance the self-on effect of the constructed CRE biosensor. 23,24 In this work, H 2 O 2 was encapsulated in a carrier of Fe 2 O 3 − NH 2 , and the pores of Fe 2 O 3 −NH 2 were blocked by a PSA aptamer (apt) and anchor DNA.…”

“…Specifically, for one thing, Fe 3 O 4 has a similar activity to peroxidase, which can effectively activate H 2 O 2 and accelerate the decomposition into free radicals. , For another, CeO 2 has excellent electrocatalytic activity due to its inherent Ce 3+ /Ce 4+ redox pair . Fe 2+ and Ce 3+ reacted with H 2 O 2 to generate more OH • , which achieved outstanding ECL signal enhancement. , Overall, the multiple signal amplification strategy can enhance the self-on effect of the constructed CRE biosensor. , …”

Coactivation of Hydrogen Peroxide Using Pyrogenic Carbon and Magnetite for Sustainable Oxidation of Organic Pollutants

“…1,2 Iron sources, including both aqueous iron and solid iron minerals, are frequently used for triggering the Fenton reaction with H 2 O 2 (eq 1). 3,4 Such Fenton/Fenton-like processes have advantages of easy availability of reactants, mild reaction conditions, simple operation, etc. Specifically, heterogeneous processes using iron minerals (e.g., magnetite, goethite, and hematite) can minimize the undesirable production of iron sludge waste that is a challenge for homogeneous Fenton processes.…”

“…Advanced oxidation processes (AOPs) using hydroxyl radical ( • OH) as the major reactive oxygen species (ROS) are among the most powerful technologies for removal of refractory organic pollutants from water, because of the strong oxidation potential of • OH ( E θ ( • OH/H 2 O) = 2.73 V) produced from activation of hydrogen peroxide (H 2 O 2 ). , Iron sources, including both aqueous iron and solid iron minerals, are frequently used for triggering the Fenton reaction with H 2 O 2 (eq ). , Such Fenton/Fenton-like processes have advantages of easy availability of reactants, mild reaction conditions, simple operation, etc. Specifically, heterogeneous processes using iron minerals (e.g., magnetite, goethite, and hematite) can minimize the undesirable production of iron sludge waste that is a challenge for homogeneous Fenton processes. , Moreover, magnetite (Fe 3 O 4 ) has been reported to be more reactive in mediating Fenton reaction than many other iron minerals .…”