Multi-wavelength spectrophotometric determination of hydrogen peroxide in water by oxidative coloration of ABTS via Fenton reaction.

In this study, a sensitive and low-cost multi-wavelength spectrophotometric method for the determination of hydrogen peroxide (HO) in water was established. The method was based on the oxidative coloration of 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulfonate) (ABTS) via Fenton reaction, which resulted in the formation of green radical (ABTS) with absorbance at four different wavelengths (i.e.

Spectrophotometric determination of hydrogen peroxide in water by oxidative decolorization of azo dyes using Fenton system.

In this study, based on the oxidative decolorization of three azo dyes (Orange G (OG), Acid Orange 7 (AO7) and Reactive Black 5 (RB5)) with hydroxyl radicals generated in Fenton system, we have successfully established three types of azo dyes spectrophotometric methods for measuring aqueous hydrogen peroxide (HO) concentration. The decolorization extent of OG, AO7 and RB5 at the corresponding characteristic wavelengths of 478 nm, 484 nm and 597 nm are proportion to the concentration of HO in aqueous solutions. Under the selected reaction conditions, three well linear correlations between the depletion of azo dyes and the HO concentration are established in the range of 0.

Spectrophotometric determination of trace hydrogen peroxide via the oxidative coloration of DPD using a Fenton system.

A low-cost and environmentally-friendly spectrophotometric method for hydrogen peroxide (HO) determination based on the oxidative coloration reaction of N,N'-diethyl-p-phenylenediamine (DPD) via the Fenton reactions in aqueous water was established. The generated pink radical cation (DPD) showed maximum absorption at 551 nm. Importantly, under the optimal conditions (pH 3.

Effective degradation of Orange G and Rhodamine B by alkali-activated hydrogen peroxide: roles of HO and O.

Advanced oxidation processes offer effective solutions in treating wastewater from various industries. The process of alkali-activated hydrogen peroxide (HO) was superior for the treatment of alkaline dye wastewater because no additional reagents were required except HO. However, an important and interesting phenomenon had been observed that the primary reactive species were found different for degrading organic pollutants with the process of alkali-activated HO.