Comparative study of oxidation of dye-Reactive Black B by different advanced oxidation processes: Fenton, electro-Fenton and photo-Fenton

Efficiency of the Photo Fenton Process for Decolorization of Direct Red 81 Dye From the Aqueous Solution

“…These results agreed with the study results of Zheng et al, (26) and Elmorsi et al (37). The Fe (II) additive effect is due to the catalytic properties of Fe (II) and more production of hydroxyl radical by increasing the concentration of (27,38). However, the addition of extra Fe (II) concentrations more than 10 mg/L resulted in a reduction in the process efficiency and acted as a scavenger for the OH°(39).…”

“…Figure 6 shows the effect of reaction time in determining optimal conditions of experiment. According to the illustration, dye removal rate is very low (33.65%) in the first 15 minutes, but increases significantly as time goes by and results in further formation of hydroxyl radicals, and maximum efficiency (98.2%) is observed in 120 minutes that corresponds with the other studies (27,44,45). The decolorization rate in this study, as in many other studies, increases by increasing the reaction time, and maximum removal efficiency occurs in the initial times, however, the efficiency does not increase significantly in final phases (35,38,44).…”

“…The study of Zheng et al in investigating oxidation acidic dye Eosin Y by the photo Fenton process showed that at pH = 3.5 and reaction time of 90 minutes, 94.1% of dye was removed and the degradation rate was dependent on dye concentration (26). The study of Huang et al on comparative survey of oxidation of dye-reactive black B by different advanced oxidation processes including Fenton, electro-Fenton and photo-Fenton indicated that Fenton alone made 70% of mineralization, whereas photo Fenton made 93% mineralization with rapid and more complete degradation of dye solution (27). The study of Mahavi et al in investigating removal of reactive red 120 and direct red 81 (DR 81) dyes from aqueous solutions by pumice showed that pumice can be used for sorption of both RR120 and DR81 dyes from aqueous solutions (6).…”

Photocatalytic degradation and photo-Fenton oxidation of Congo red dye pollutants in water using natural chromite—response surface optimization

“…This might be attributed to the increase in the produced hydroxyl radicals with increasing the chromium and ferrous oxide according to Eqs. 5 and 9 (Huang et al 2008). Galindo et al (2001) set an empirical relation between the degradation rate and the mass of the used catalyst (r o µ [MC] n [dye]), where r o is the reciprocal initial rate, MC is the mass of the used catalyst and n is an exponent less than 1 for the studied dye, in relation to low mass of the used catalyst.…”

Study on the Treatment of Effluents from Paint Industry by Modified Electro-Fenton Process

“…Advanced oxidation processes (AOPs) have been thought as effective routes for treatment of paint manufacturing wastewater. Paint manufacturing wastewater has many kinds of high concentration complex organic constituents, but the conventional method such as coagulation is not useful for removal of total organic carbon (TOC) and chemical oxygen demand (COD) [2]. Alternative technology has been developed to help solving the problem.…”