Degradation of nitrophenols by Fenton and photo-Fenton processes

Kavitha, V.; Palanivelu, K.

doi:10.1016/j.jphotochem.2004.08.003

Cited by 187 publications

(118 citation statements)

References 54 publications

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“…In theory, the photo-Fenton degradation of 4-NP in the presence of Fe-MABs could be the sum of heterogeneous photoFenton (on the bead's surface) and homogeneous photo-Fenton (from leached iron species in solution); indeed, the obtained value of k PF is comparable to that reported for solution photo-Fenton of 4-NP (k PF(sln) = 0.023 min −1 ) determinate by using 1.43 mM of 4-NP, 17.3 mM of H 2 O 2 and 0.45 mM of Fe 2+ [38]. However, during irradiation with Fe-MABs, photo-Fenton process is detectable already in the first 5 min when the iron leached in solution is minimal.…”

Section: Scheme 1 (A) Mechanism Ofsupporting

confidence: 84%

Neutral solar photo-Fenton degradation of 4-nitrophenol on iron-enriched hybrid montmorillonite-alginate beads (Fe-MABs)

Barreca

Colmenares

Pace

et al. 2014

Journal of Photochemistry and Photobiology A: Chemistry

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a b s t r a c tHybrid montmorillonite-alginate beads (MABs) were prepared by the ion-gelation method from alginate and montmorillonite clay suspension dropped in a calcium chloride solution. Similarly, iron-enriched beads (Fe-MABs) were prepared using iron-exchanged montmorillonite. All beads were characterized by atomic absorption and Fourier-transform infrared spectroscopy. The efficiency of Fe-MABs as catalysts for the solar photo-Fenton performed at initial pH = 7.0 was evaluated by varying the catalyst amount and hydrogen peroxide concentration, and monitoring the removal of 4-nitrophenol (4-NP) at initial concentration of 10 ppm. A kinetic analysis showed that the removal of 4-NP by Fe-MABs followed a pseudo first-order kinetics model (R 2 = 0.966). High 4-NP removal (75%) was achieved with 25 Fe-MABs by using 150 ppm of hydrogen peroxide and 40 min of irradiation, while total 4-NP removal was obtained by using 500 ppm of hydrogen peroxide. Moreover, preliminary studies about beads' recycling showed good removal efficiencies for the first three cycles.

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Section: Scheme 1 (A) Mechanism Ofsupporting

confidence: 84%

Neutral solar photo-Fenton degradation of 4-nitrophenol on iron-enriched hybrid montmorillonite-alginate beads (Fe-MABs)

Barreca

Colmenares

Pace

et al. 2014

Journal of Photochemistry and Photobiology A: Chemistry

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“…H 2 O 2 may also be obtained via the in situ reaction of oxalic acid with dissolved dioxygen during light irradiation to trigger a Fenton-like process [22][23][24][25][26][27][28][29][30][31][32]. The photo Fenton-like process is described as follows through Eqs.…”

Section: Introductionmentioning

confidence: 99%

Graphene oxide enhances the Fenton-like photocatalytic activity of nickel ferrite for degradation of dyes under visible light irradiation

Liu

Xiao

Feng

et al. 2013

Carbon

119

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“…Fenton process has been reported to be successful when applied to the treatment of several organic chemicals [10][11][12][13][14][15][16][17][18][19], mainly among the aromatics, and wastewaters like textile dye industry effluent [20], pulp industry effluent [21] and landfill leachate [7,22]. Despite its highly oxidative efficiency and environmental friendly nature, the application of Fenton's reagent to wastewater treatment is limited by the final production of ferric iron sludge, which may add additional waste disposal cost.…”

Section: Introductionmentioning

confidence: 99%

The role of iron on the degradation and mineralization of organic compounds using conventional Fenton and photo-Fenton processes

Hermosilla

Cortijo

Huang

2009

Chemical Engineering Journal

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a b s t r a c tThe role of iron on the degradation of different organic compounds, differing in their structure (aliphatic versus aromatic) and iron complex formation capacity, by conventional and photo-Fenton processes was investigated. Results show that these chemical characteristics can affect the degree of treatment in terms of COD and TOC removals. While aromatics exhibited a fast and great reduction in the COD by the conventional Fenton process, aliphatic compounds, apart from acetic acid, required the presence of UV light to enhance treatment results. EDTA and oxalic acid responded very positively to UV irradiation in both COD removal and mineralization, reaching the highest values showed by aromatics; and results depended on the intensity of the UV light applied. Phenol and 4-nitrophenol responded favourably to UV irradiation in terms of mineralization and slightly in COD removal. Reductions in the COD were almost total (95.99%), while only an 80% of reduction in the TOC was achieved, for the best photo-Fenton treatment of oxalic acid, phenol and nitrophenol. 60% COD and 40% TOC removals were achieved correspondingly in the case of EDTA. Acetic acid showed almost no mineralization and low COD removal (≈20%) when treated by a conventional Fenton process; and did not enhanced results when assisting the treatment with UV light. Photo-regeneration of ferrous ion and photo-decarboxylation of iron carboxylates are assessed in the framework of these results.

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Degradation of nitrophenols by Fenton and photo-Fenton processes

Cited by 187 publications

References 54 publications

Neutral solar photo-Fenton degradation of 4-nitrophenol on iron-enriched hybrid montmorillonite-alginate beads (Fe-MABs)

Neutral solar photo-Fenton degradation of 4-nitrophenol on iron-enriched hybrid montmorillonite-alginate beads (Fe-MABs)

Graphene oxide enhances the Fenton-like photocatalytic activity of nickel ferrite for degradation of dyes under visible light irradiation

The role of iron on the degradation and mineralization of organic compounds using conventional Fenton and photo-Fenton processes

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