Interaction of tannic acid with ferric iron to assist 2,4,6-trichlorophenol catalytic decomposition and reuse of ferric sludge as a source of iron catalyst in Fenton-based treatment

Bolobajev, Juri; Trapido, Marina; Goi, Anna

doi:10.1016/j.apcatb.2016.01.015

Cited by 80 publications

(31 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…(2)) [22]. The ferric precipitates are more inactive than free Fe(III) due to the additional reaction required to release soluble iron on the surface of the precipitates, which results in slower HO• generation [34]. …”

Section: Resultsmentioning

confidence: 99%

“…With the increase of solution pH, Fe(III) existed as iron hydroxides which resulted in less HO• production. Even though TCE degradation could occur on the surface of ferric precipitates, the ferric precipitates were less active than free Fe(III) due to the lower intrinsic activity [34]. Hence we presumed that the minor TCE removal at pH 7 was the result of AA addition at the beginning which enhanced the dissolution of ferric precipitates.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Application of ascorbic acid to enhance trichloroethene degradation by Fe(III)-activated calcium peroxide

Zhang

Brusseau

et al. 2017

Chemical Engineering Journal

View full text Add to dashboard Cite

The enhancement effect of an environmentally friendly reducing agent, ascorbic acid (AA), on trichloroethene (TCE) degradation by Fe(III)-activated calcium peroxide (CP) was evaluated. The addition of AA accelerated the transformation of Fe(III) to Fe(II), and the complexation of Fe(III)/Fe(II) with AA and its products alleviated the precipitation of dissolved iron. These impacts enhanced the generation of reactive oxygen species (ROSs). Investigation of ROSs using chemical probe tests, electron paramagnetic resonance (EPR) tests, and radical scavenger tests strongly confirm large production of hydroxyl radicals (HO•) that is responsible for TCE degradation. The generation of Cl− from the degraded TCE was complete in the enhanced CP/Fe(III)/AA system. The investigation of solution matrix effects showed that the TCE degradation rate decreases with the increase in solution pH, while Cl−, SO42− and NO3− anions have minor impact. Conversely, HCO3− significantly inhibited TCE degradation due to pH elevation and HO• scavenging. The results of experiments performed using actual groundwater indicated that an increase in reagent doses are required for effective TCE removal. In summary, the potential effectiveness of the CP/Fe(III)/AA oxidation system for remediation of TCE contaminated groundwater has been demonstrated. Additional research is needed to develop the system for practical implementation.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Application of ascorbic acid to enhance trichloroethene degradation by Fe(III)-activated calcium peroxide

Zhang

Brusseau

et al. 2017

Chemical Engineering Journal

View full text Add to dashboard Cite

show abstract

“…The total organic carbon (TOC) of the solution was analyzed using a TOC-VCPH analyzer (Shimadzu). The concentrations of hydroxyl radical and H 2 O 2 were spectrophotometrically determined by deoxyribose method [31] and titanium potassium oxalate method [6]. Electron paramagnetic resonance (EPR) spectra were obtained on a EPR spectrometer (Bruker A300-10/12) using 5, 5-dimethyl-1-pyrroline N-oxide (DMPO) as a spin-trapping agent.…”

Section: Methodsmentioning

confidence: 99%

“…Considering the generation of hydroxyl radicals in Vis/catalyst/H 2 O 2 system, 2-deoxy-d-ribose, which can easily react with • OH to produce the malondialdehyde that reacts with 2-thiobarbituric acid, was employed to measure the hydroxyl radicals concentration [31]. (9)) [42].…”

Section: Hydroxyl Radicals and H 2 O 2 Consumptionmentioning

confidence: 99%

Constructing highly catalytic oxidation over BiOBr-based hierarchical microspheres: Importance of redox potential of doped cations

Zou

Geng

et al. 2017

Molecular Catalysis

View full text Add to dashboard Cite

a b s t r a c tIn this work, we prepared BiOBr-based hierarchical microspheres by a simple solvothermal method. The phase structure, morphology and optical properties of catalysts were well characterized by XRD, FESEM, FTIR, UV-DR spectra, XPS valence band and BET surface area analysis. Among the Vis/catalyst/H 2 O 2 system, Cu-BiOBr is found to be the most effective for rhodamine b degradation while Fe-BiOBr exhibits the highest catalytic activity for the mineralization of 2-chlorophenol. Hydroxyl radicals generation rate and H 2 O 2 decomposition rate follow: Fe-BiOBr > BiOBr > Zn-BiOBr = Ni-BiOBr = Ag-BiOBr > Cu-BiOBr, and CuBiOBr > Fe-BiOBr > BiOBr = Zn-BiOBr = Ni-BiOBr > Ag-BiOBr, respectively. The catalytic mechanisms under Vis/catalyst/H 2 O 2 systems are proposed and compared, as following: (1) for BiOBr/Zn-BiOBr/Ni-BiOBr/AgBiOBr, the activation of H 2 O 2 by photoelectrons to generate hydroxyl radical; (2) for Fe-BiOBr, the reaction of Fe(II) or photoelectrons with H 2 O 2 to produce hydroxyl radical, and Fe(III) is reduced by photoelectrons to Fe(II); (3) for Cu-BiOBr, the activation of H 2 O 2 by photoelectrons to generate hydroxyl radical that probably oxides Cu(II) to Cu(III), and the reaction of Cu(I) with H 2 O 2 to generate Cu(III). The trapping experiments display that holes and hydroxyl radicals (or Cu(III)) have dominant roles.

show abstract

“…Fe 0 and its related Fe 2+ and Fe 3+ species are long-established catalysts in both an aqueous and a gaseous environment for a number of reactions (e.g., [130][131][132][133]). Historically, the key component in a Fe 0 catalyst is carbon.…”

Section: F2 Fe Catalystmentioning

confidence: 99%

ZVI (Fe0) Desalination: Stability of Product Water

Antia¹

2016

Resources

View full text Add to dashboard Cite

A batch-operated ZVI (zero valent iron) desalination reactor will be able to partially desalinate water. This water can be stored in an impoundment, reservoir or tank, prior to use for irrigation. Commercial development of this technology requires assurance that the partially-desalinated product water will not resalinate, while it is in storage. This study has used direct ion analyses to confirm that the product water from a gas-pressured ZVI desalination reactor maintains a stable salinity in storage over a period of 1-2.5 years. Two-point-three-litre samples of the feed water (2-10.68 g (Na + + Cl´)¨L´1) and product water (0.1-5.02 g (Na + + Cl´)¨L´1) from 21 trials were placed in storage at ambient (non-isothermal) temperatures (which fluctuated between´10 and 25˝C), for a period of 1-2.5 years. The ion concentrations (Na + and Cl´) of the stored feed water and product water were then reanalysed. The ion analyses of the stored water samples demonstrated: (i) that the product water salinity (Na + and Cl´) remains unchanged in storage; and (ii) the Na:Cl molar ratios can be lower in the product water than the feed water. The significance of the results is discussed in terms of the various potential desalination routes. These trial data are supplemented with the results from 122 trials to demonstrate that: (i) reactivity does not decline with successive batches; (ii) the process is catalytic; and (iii) the process involves a number of steps.

show abstract

Interaction of tannic acid with ferric iron to assist 2,4,6-trichlorophenol catalytic decomposition and reuse of ferric sludge as a source of iron catalyst in Fenton-based treatment

Cited by 80 publications

References 43 publications

Application of ascorbic acid to enhance trichloroethene degradation by Fe(III)-activated calcium peroxide

Application of ascorbic acid to enhance trichloroethene degradation by Fe(III)-activated calcium peroxide

Constructing highly catalytic oxidation over BiOBr-based hierarchical microspheres: Importance of redox potential of doped cations

ZVI (Fe0) Desalination: Stability of Product Water

Contact Info

Product

Resources

About