Heterogeneous Fenton catalysts for the abatement of organic pollutants from aqueous solution: a review

Nidheesh, P.V.

doi:10.1039/c5ra02023a

Cited by 492 publications

(226 citation statements)

References 224 publications

(209 reference statements)

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“…This is confirmed by several recent review articles on the synthesis and application of heterogeneous metal/magnetic phases in CWPO, either directly applied as catalysts or included in very distinct support/hybrid materials [8,[13][14][15][16][17][18][19][20][21]. Under this context, our previous work has been mainly focused on the combination of active and magnetically separable iron-based materials with the easily tuned properties of carbon-based materials [14].…”

Section: Introductionmentioning

confidence: 65%

Hybrid magnetic graphitic nanocomposites towards catalytic wet peroxide oxidation of the liquid effluent from a mechanical biological treatment plant for municipal solid waste

Ribeiro

Rodrigues

Silva

et al. 2017

Applied Catalysis B: Environmental

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a b s t r a c tMagnetite, nickel and cobalt ferrites were prepared and encapsulated within graphitic shells, resulting in three hybrid magnetic graphitic nanocomposites. Screening experiments with a 4-nitrophenol aqueous model system (5 g L −1 ) allowed to select the best performing catalyst, which was object of additional studies with the liquid effluent resulting from a mechanical biological treatment plant for municipal solid waste. Due to its high content in bicarbonates (14350 mg L −1 ) and chlorides (2833 mg L −1 ), controlling the initial pH was a crucial step to maximize the performance of the catalytic wet peroxide oxidation (CWPO) treatment. The catalyst load was 0.5 g L −1 , a very low dosage when compared to the high chemical oxygen demand (COD) of the effluent − 9206 mg L −1 . At the optimum operating pH (i.e., pH = 6), ca. 95% of the aromaticity was converted and ca. 55% of COD and total organic carbon (TOC) of the liquid effluent was removed. The biodegradability of the liquid effluent was enhanced during the treatment by CWPO, as reflected by the 2-fold increase of the five-day biochemical oxygen demand (BOD 5 ) to COD ratio (BOD 5 /COD), namely from 0.21 (indicating non-biodegradability) to 0.42 (suggesting biodegradability of the treated wastewater). In addition, the treated water revealed no toxicity against selected bacteria.Lastly, a magnetic separation system was designed for in-situ catalyst recovery after the CWPO reaction stage. The high catalyst stability was demonstrated through five reaction/separation sequential experiments in the same vessel with consecutive catalyst reuse.

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Section: Introductionmentioning

confidence: 65%

Hybrid magnetic graphitic nanocomposites towards catalytic wet peroxide oxidation of the liquid effluent from a mechanical biological treatment plant for municipal solid waste

Ribeiro

Rodrigues

Silva

et al. 2017

Applied Catalysis B: Environmental

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“…In this case, the costs associated to the subsequent treatment and disposal of the iron sludge may represent up to 50% of the total operating costs [13]. In order to overcome these constrains, the use of heterogeneous metal/ magnetic phases, either directly applied as catalyst in CWPO or included in very distinct support/hybrid materials, such as those containing alumina, silica, carbon materials, zeolites, pillared clays, minerals and others, have received a great deal of attention from the scientific community, as confirmed by several review articles published in recent years [11,13,[16][17][18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

The role of cobalt in bimetallic iron-cobalt magnetic carbon xerogels developed for catalytic wet peroxide oxidation

et al. 2017

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A B S T R A C TThree magnetic carbon xerogels were developed by inclusion of iron and/or cobalt precursors during the synthesis procedure. The synthesized materials were tested in the catalytic wet peroxide oxidation (CWPO) of aqueous solutions containing 4-nitrophenol (4-NP) − a refractory organic model pollutant, under a water treatment process intensification approach. For that purpose, the experimental runs were performed with high pollutant load (5 g L, corresponding to a fixed pollutant/catalyst mass ratio of 2), atmospheric pressure, 50°C, pH = 3 and stoichiometric amount of hydrogen peroxide (H 2 O 2 ).The bimetallic magnetic carbon xerogel catalyst (CX/CoFe) was more active than each of the monometallic catalysts (CX/Fe or CX/Co). The better performance was explained in terms of a synergic association of factors: (i) the enhanced accessibility to the active iron species at the surface of CX/CoFe promoted by the simultaneous incorporation of cobalt, (ii) the ability of metallic Co to catalyse H 2 O 2 decomposition via hydroxyl radicals (HO%) formation, and (iii) the efficient reduction of Fe 3+ to Fe 2+ promoted by metallic Co on the surface of CX/CoFe. A 4-NP conversion of 98.5% was determined after 30 min of CWPO reaction. Leaching of the iron species in the bimetallic CX/CoFe was considerably reduced with relation to the monometallic iron catalyst. However, partial catalyst deactivation occurred due to lower stability of oxidized cobalt species. A detailed reaction mechanism is proposed for the surface catalytic reactions occurring over the CX/CoFe catalyst.

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“…Different from other published reviews, which have focused on the preparation and performance of the catalysts (Dhakshinamoorthy et al, 2012;Garrido-Ramirez et al, 2010;Navalon et al, 2010a;Nidheesh, 2015;Perathoner and Centi, 2005), this article reviews the fundamental interfacial mechanisms of the heterogeneous Fenton reactions catalyzed by iron-based materials, which may also provide insights for the enhancement of heterogeneous Fenton reactions with additional energy, such as ultraviolet and visible light (UV-Vis), electricity, and ultrasound.…”

Section: Introductionmentioning

confidence: 99%

Interfacial mechanisms of heterogeneous Fenton reactions catalyzed by iron-based materials: A review

Yang

Men

et al. 2016

Journal of Environmental Sciences

469

153

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The heterogeneous Fenton reaction can generate highly reactive hydroxyl radicals (UOH) from reactions between recyclable solid catalysts and H 2 O 2 at acidic or even circumneutral pH. Hence, it can effectively oxidize refractory organics in water or soils and has become a promising environmentally friendly treatment technology. Due to the complex reaction system, the mechanism behind heterogeneous Fenton reactions remains unresolved but fascinating, and is crucial for understanding Fenton chemistry and the development and

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Heterogeneous Fenton catalysts for the abatement of organic pollutants from aqueous solution: a review

Abstract: Fenton processes have gained much attention in the field of wastewater treatment during recent years.

Cited by 492 publications

References 224 publications

Hybrid magnetic graphitic nanocomposites towards catalytic wet peroxide oxidation of the liquid effluent from a mechanical biological treatment plant for municipal solid waste

Hybrid magnetic graphitic nanocomposites towards catalytic wet peroxide oxidation of the liquid effluent from a mechanical biological treatment plant for municipal solid waste

The role of cobalt in bimetallic iron-cobalt magnetic carbon xerogels developed for catalytic wet peroxide oxidation

Interfacial mechanisms of heterogeneous Fenton reactions catalyzed by iron-based materials: A review

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