Graphene-based materials for the catalytic wet peroxide oxidation of highly concentrated 4-nitrophenol solutions

Ribeiro, Rui S.; Silva, Adrián M.T.; Pastrana‐Martínez, Luisa M.; Figueiredo, José L.; Faria, Joaquim L.; Gomes, Helder

doi:10.1016/j.cattod.2014.10.004

Cited by 62 publications

(65 citation statements)

References 41 publications

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“…In the particular case of 4-NP, it was shown in previous works that the presence of the phenolic −OH group together with the eNO 2 group, is favourable to an electrophilic attack at the ortho position in respect to the eOH group, leading to the formation of 4-nitrocatechol [25,26]. Nevertheless, hydroquinone, 1,4-benzoquinone and catechol can also be formed, in accordance with the oxidation mechanism previously proposed [26].…”

Section: Oxidation Mechanismsupporting

confidence: 57%

“…Total organic carbon (TOC) was determined using a Shimadzu TOC-L CSN analyser. In both cases, sodium sulphite was used in order to consume residual H 2 O 2 [26]. The concentration of H 2 O 2 [26] and the dissolved iron content [23] were determined by colorimetric methods, while the dissolved cobalt was determined by atomic absorption spectroscopy [23].…”

Section: Methodsmentioning

confidence: 99%

“…The parent compound 4-NP and possible oxidation by-products were determined by high performance liquid chromatography (HPLC), using a previously described method [26]. Total organic carbon (TOC) was determined using a Shimadzu TOC-L CSN analyser.…”

Section: Methodsmentioning

confidence: 99%

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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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Section: Oxidation Mechanismsupporting

confidence: 57%

Section: Methodsmentioning

confidence: 99%

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

et al. 2017

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“…At the same surface area dose, the catalytic efficiencies of three rGOs followed the ascending order of rGO 250 rGO 600 < rGO 1000 . Previous research had presented that structural defect region in carbon nanomaterials had higher electron density and more active than the pristine graphite region [42]. Therefore, the catalytic ability of three rGOs increasing with the increase of their structural defect contents in this study clearly suggested the relationship between oxidative reaction of MOP and the structural defects on rGOs.…”

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confidence: 48%

Reduced graphene oxide-catalyzed oxidative coupling reaction of 4-methoxyphenol in aerobic aqueous solution

Xie

Sun

et al. 2017

Carbon

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“…Extensive studies have been conducted on their synthesis, characterization, and applications [35][36][37]. In literature, different catalytic systems have been employed where hydrogen peroxide decomposition was carried out using 17.8 g·L −1 of H 2 O 2 and 2.5 g·L −1 of bimetallic magnetic carbon xerogels with cobalt and iron microparticles at 50 • C and pH = 3 for 2 h. A maximum yield of 65% H 2 O 2 decomposition was reported [38]. Bourlinos et al studied the constant rate of hydrogen peroxide decomposition using Fe-doped carbon dots as a nanocatalyst, which was found to be 0.7 × 10 −1 min −1 (with 10 mL 0.02 M of peroxide solution and 10 mg of Fe-doped carbon dots).…”

Section: Introductionmentioning

confidence: 99%

Highly ordered Nanomaterial Functionalized Copper Schiff Base Framework: Synthesis, Characterization, and Hydrogen Peroxide Decomposition Performance

2017

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An immobilized copper Schiff base tridentate complex was prepared in three steps from SBA-15 supports. The immobilized copper nanocatalyst (heterogeneous catalyst) was characterized by Fourier transform infrared spectroscopy (FT-IR), cross polarization magic angle spinning (CP-MAS), 13-carbon nuclear magnetic resonance ( 13 C-NMR), atomic absorption spectroscopy (AAS), thermogravimetric analysis (TGA), and N 2 -physisorption. Moreover, morphological and structural features of the immobilized nanocatalyst were analyzed using transmission electron microscopy (TEM) and X-ray powder diffraction spectrometry (PXRD). After characterizing the nanocatalyst, the catalytic activity was determined in hydrogen peroxide (H 2 O 2 ) decomposition. The high decomposition yield of H 2 O 2 was obtained for low-loaded copper content materials at pH 7 and at room temperature. Furthermore, the nanocatalyst exhibited high activity and stability under the investigated conditions, and could be recovered and reused for at least five consecutive times without any significant loss in activity. No copper leaching was detected during the reaction by AAS measurements.

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Graphene-based materials for the catalytic wet peroxide oxidation of highly concentrated 4-nitrophenol solutions

Cited by 62 publications

References 41 publications

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

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

Reduced graphene oxide-catalyzed oxidative coupling reaction of 4-methoxyphenol in aerobic aqueous solution

Highly ordered Nanomaterial Functionalized Copper Schiff Base Framework: Synthesis, Characterization, and Hydrogen Peroxide Decomposition Performance

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