Notice of RetractionInfluencing factors and dynamic characters of formaldehyde degradation by the UV-Fenton process

Notice of Retraction

After careful and considered review of the content of this paper by a duly constituted expert committee, this paper has been found to be in violation of IEEE´s Publication Principles.

We hereby retract the content of this paper. Reasonable effort should be made to remove all past references to this paper.

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The UV-Fenton treatment of formaldehyde (HCHO) was studied in a batch photochemical reactor. This is based on the purpose to reveal the reaction rules of HCHO as an intermediate product in the degradation of many other kinds of organic wastewater. The oxidation course can be divided into rapid reaction stage, transition stage and slow reaction stage. The effects of Fe²⁺, H₂O₂ concentration and the pH on the HCHO removal were studied in various conditions. 91.89% of the HCHO removal was obtained within 30 minutes in the presence of 22.4 mg/L of Fe²⁺, 64 mg/L of H₂O₂, pH 3 and a temperature of 23°C. Through using the first order kinetic model by stages, it indicates that the rate constants of the rapid reaction stage are much greater than the slow reaction stage. The activation energies in the two stages are respectively 7.49 and 13.49 kJ·mol^-1. The temperature coefficient of the UV-Fenton reaction is small. But in the slow reaction stage of the reactions, the temperature has higher influence on the reaction velocity and begins to have minus effects for the HCHO degradation when it is above 40°C.