Oxidation of caffeine by acid‐activated ferrate(VI): Effect of ions and natural organic matter

Manoli, Kyriakos; Nakhla, George; Ray, Ajay K.; Sharma, Virender K.

doi:10.1002/aic.15878

Cited by 44 publications

(27 citation statements)

References 66 publications

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“…Fe(VI) can be used for oxidation, coagulation, and disinfection of urban and industrial wastewater in one reactor. Many attempts have been made to use the Fe(VI) oxidation process to remove various contaminants from the wastewater (11,(13)(14)(15)(16)(17)(18)(19)(20)(21). Photocatalytic oxidation is another popular method that has been widely used to remove dye from wastewater.…”

Section: Introductionmentioning

confidence: 99%

Comparing the ZnO/Fe(VI), UV/ZnO and UV/Fe(VI) processes for removal of Reactive Blue 203 from aqueous solution

Talaiekhozani

Banisharif

Bazrafshan³

et al. 2019

Environ Health Eng Manag

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Background: Wastewater contaminated with dyes such as Reactive Blue 203 can produce a lot of health problems if it is released into the environment without a suitable treatment. Although there are several studies on dye removal from wastewater, removal of Reactive Blue 203 has not been investigated by hybrid methods. Therefore, the aim of this study was to investigate the removal of Reactive Blue 203 from aqueous solution, using combined processes of zinc oxide (ZnO) nanoparticles, Fe(VI) oxidation process, and UV radiation. Methods: The removal of dye from aqueous solution using ZnO nanoparticles, Fe(VI) oxidation process, and UV radiation was individually evaluated. Then, the results of combined methods were compared. Hydraulic retention time (HRT), pH, and temperature were the most important factors which were investigated in this study. Results: ZnO nanoparticles, Fe(VI) oxidation process, and UV radiation were able to remove 97%, 71%, and 47% of the dye in the optimal conditions, respectively. Also, the removal of dye using combination of Fe(VI) oxidation process/UV radiation, ZnO nanoparticles/Fe(VI) oxidation process, and ZnO nanoparticles/UV radiation under optimum conditions was 100%. It seems that the combined methods were significantly more effective than the methods alone for removal of dye from water. Conclusion: UV radiation alone is a simple and efficient method for removal of Reactive Blue 203 from water. Removal of Reactive Blue 203 using Fe(VI) oxidation process can be completed in a fraction of second, therefore, it can be categorized as a rapid reaction.

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Section: Introductionmentioning

confidence: 99%

Comparing the ZnO/Fe(VI), UV/ZnO and UV/Fe(VI) processes for removal of Reactive Blue 203 from aqueous solution

Talaiekhozani

Banisharif

Bazrafshan³

et al. 2019

Environ Health Eng Manag

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“…The impact of anions (Cl − , SO 4 2− , and HCO 3 − ), monovalent cation (Na + ), and divalent cations (Ca 2+ and Mg 2+ ) on the efficiency of As(III) adsorption onto Aerocrete and Vermiculite was investigated. The concentrations of the individually added ions were selected to be consistent with their concentrations usually found in wastewater . No significant effect (i.e., decrease of less than 10 % removal efficiency) of Ca 2+ , Mg 2+ , Na + , HCO 3 − , or Cl − on As(III) adsorption onto Aerocrete and Vermiculite was observed (Figure ).…”

Section: Resultsmentioning

confidence: 99%

“…The concentrations of the individually added ions were selected to be consistent with their concentrations usually found in wastewater. [42,43] No significant effect (i.e., decrease of less than 10 % removal efficiency) of Ca 2+ , Mg 2+ , Na + , HCO 3 − , or Cl − on As(III) adsorption onto Aerocrete and Vermiculite was observed ( Figure 5). This can be explained by the As(III) strong binding ability to the iron oxyhydroxide surface compared to other ions.…”

Section: Effect Of Ions On the Adsorption Of As(iii)mentioning

confidence: 99%

Removal of arsenic(III) from aqueous solution by concrete‐based adsorbents

2019

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The present paper investigates the adsorption of arsenic(III) (As(III)) onto 2 concrete‐based low‐cost materials, i.e., Aerocrete and Vermiculite impregnated by ferric oxyhydroxide. Adsorption experiments were performed to study the effect of initial pH, initial concentration of As(III), contact time, and ions usually present in water. No significant effect of the initial pH on the adsorption of As(III) by Aerocrete and Vermiculite was observed at the pH range of 4–8. The As(III) removal efficiency decreased at a high initial pH (i.e., 10). The Langmuir isotherm showed that the maximum As(III) adsorption capacity of Aerocrete and Vermiculite is 15.15 and 13.51 mg/g, respectively, which is higher than that observed using titanium dioxide (i.e., 3.52 mg/g), at pH 7 and 24 ±1 °C. A pseudo‐second order kinetic model fitted well the experimentally obtained kinetic data. This suggests that chemisorption most probably controls the adsorption of As(III) on Aeroctere and Vermiculite. Significantly, As(III) (1 mg/L) could be removed almost completely by both Aeroctere and Vermiculite (1 g/L) in 30 and 60 min, respectively at pH 7 and 24 ±1 °C. Importantly, Ca2+, Mg2+, Na+, HCO3−, SO42−, and Cl− ions had no significant effect on the adsorption of As(III) on Aeroctere and Vermiculite. The results showed that the proposed concrete‐based adsorbents have the potential to remove As(III) from water.

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“…In 2017, Ray and co-workers used acid-activated potassium ferrate to oxidize caffeine ( Scheme 14A ). 22 Soon after, in 2018, Jiang and co-workers reported a photooxygenation of benzylic sp 3 C–H using iron chloride and lithium bromide under visible light irradiation ( Scheme 14B ). 23 In order to study the active species in the reaction, they prepared TBA[FeCl 3 Br] and characterized it via single crystal X-ray diffraction ( Scheme 14 , mechanistic study).…”

Section: Perspectivementioning

confidence: 99%