Heterogeneous Photo-Fenton Reaction Catalyzed by Nanosized Iron Oxides for Water Treatment

Table 1

Varieties of Fenton reactions.

	Reagents	pH	Iron; loss	Light
Classic Fenton	H2O2, Fe^2+	2–4	Yes	No
Fenton-like	H2O2, Fe^3+	2–4	Yes	No
Photo-Fenton	H2O2, iron complex, free iron ions	Acidic to neutral	Yes	Yes
Heterogeneous Fenton	H2O2, solid iron oxide	Wide range	No	No
Electro-Fenton	Electrogenerated H2O2, free iron ions; H2O2, electrogenerated Fe^2+	2–4	Yes
Heterogeneous photo-Fenton	H2O2, solid iron oxide	Wide range	No	Yes
Heterogeneous photoelectro-Fenton	Electrogenerated H2O2, solid iron oxide	Wide range	No	Yes