Comparative Study on UV-AOPs for Efficient Continuous Flow Removal of 4-tert-Butylphenol

Abstract

In the present study, UV-light-driven advanced oxidation processes (AOPs) have been employed for the degradation of 4-tert-Butylphenol (4-t-BP) in water under continuous flow conditions. The effects of varying space time (10, 20, 40, 60 and 120 min) and oxidant dosage (88.3 mg/L, 176.6 mg/L and 264 mg/L) were examined. 4-t-BP degradation efficiency in the UV-induced AOPs followed the order of UV/H2O2 (264.9 mg/L) ≈ UV/Fe2+/H2O2 > UV/Fe3+/H2O2 > UV/H2O2 (176.6 mg/L) > UV/H2O2 (88.3 mg/L) > UV/Fe-TiO2 > UV/TiO2 > UV, while UV/Fe3+/H2O2 was the most efficient process in terms of Total Organic Carbon (TOC) removal (at the space time of 60 min) among those tested. The combination of UV with 88.3 mg/L H2O2 enhanced pollutant removal from 51.29% to 93.34% after 10 min of irradiation. The presence of H2O2 contributed to the highest 4-t-BP and TOC removal values. Interestingly, the increase in space time from 20 to 60 min resulted in surpassing of the activity of the Fe-TiO2 over commercial TiO2, although it had an almost negligible positive impact on the performance of the UV/H2O2 system as well as H2O2 concentration. The results obtained showed that more than 80% of 4-t-BP could be successfully degraded by both heterogeneous and homogeneous AOPs after 60 min.

Degradation of Diazepam with Gamma Radiation, High Frequency Ultrasound and UV Radiation Intensified with H2O2 and Fenton Reagent

“…For the case of gamma radiation, the model adequately describes the experiment according to Equation (19) with a correlation coefficient of 0.99. All coefficients of the model are significant for a significance level of less than 0.05. and [H2O2] the concentration of H2O2.…”

“…Considering the high impact of pharmaceutical products, it is very important to remove them from the wastewater before discharge. Several researches carried out in recent years point to the use of advanced oxidation processes (AOPs) as innovative technologies for the elimination of persistent pollutants [6,[15][16][17][18][19][20][21].…”

UV and Zero-Valent Iron (ZVI) Activated Continuous Flow Persulfate Oxidation of Municipal Wastewater

“…Obviously, a higher space time enhances the generation of radical oxidative species and improves thus the TOC removal. Mergenbayeva and Poulopoulos reported that increasing the space time from 10 min to 120 min under UV radiation caused the 4-tert-butylphenol degradation enhancement from 46% to 84% [56]. Both space time and residence time significantly impact the kinetics of the process [57].…”

Photocatalytic treatment of metronidazole-containing wastewater

“…Advanced oxidation processes (AOPs) could provide interesting solutions to this problem. AOPs are a large class of oxidative techniques that mainly rely on the production of hydroxyl ( • OH) and sulfate radicals (SO4 •-) [9,10]. Among different AOPs, heterogeneous photocatalysis receives great attention from researchers due to the convenient separation and possible reuse of the photocatalyst [10,11].…”

“…AOPs are a large class of oxidative techniques that mainly rely on the production of hydroxyl ( • OH) and sulfate radicals (SO4 •-) [9,10]. Among different AOPs, heterogeneous photocatalysis receives great attention from researchers due to the convenient separation and possible reuse of the photocatalyst [10,11]. Photocatalysts can be activated by light, which results in oxidation of the electron hole in the valence band and reduction of the electron in the conduction band.…”