Rational design of manganese ferrite-graphene hybrid photocatalysts: Efficient water splitting and effective elimination of organic pollutants

Mohamed, Mohamed Mokhtar; Ibrahim, Islam; Salama, Tarek M.

doi:10.1016/j.apcata.2016.06.031

Cited by 51 publications

(13 citation statements)

References 54 publications

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“…As a decrease in the oxygen content on the NG and the consequences of the formation of sp 3 -hybridized carbon atoms, an upward VB shift with no change of the CB is likely. 46 Thus, the exhibited small band gap can allow NG to work as a photosensitizer capable of expanding the visible light absorption range. Due to the declared semiconductor nature of the NG, it excites more electrons from the VB, which hardly can react with O 2 – as the reactive study confirms but indeed can be trapped by carbon atoms in GO/G due to their p-type character.…”

Section: Results and Discussionmentioning

confidence: 99%

Nitrogen Graphene: A New and Exciting Generation of Visible Light Driven Photocatalyst and Energy Storage Application

et al. 2018

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The synthesis of nitrogen, boron, and nitrogen–boron-codoped graphenes was attained via mixing solutions of GO with urea, boric acid, and a mixture of both, respectively, followed by drying in vacuum and annealing at 900 °C for 10 h. These materials were thoroughly characterized employing XRD, TEM, FTIR, Raman, UV–vis, XPS, IPCE%, and electrical conductivity measurements. The nitrogen-doped graphene (NG) showed an excellent supercapacitor performance with a higher specific capacitance (388 F·g –1 at 1 A·g –1 ), superior stability, and a higher power density of 0.260 kW kg –1 . This was mainly due to the designated N types of doping and most importantly N–O bonds and to lowering charge transfer and equivalent series resistances. The NG also indicated the highest photocatalytic performance for methylene blue (MB 20 ppm, power = 160 W, λ > 420 nm) and phenol (5 ppm) degradation under visible light illumination with rate constants equal 0.013 min –1 and 0.04 min –1 , respectively. The photodegradation mechanism was proposed via determining the energy band potentials using the Mott–Schottky measurements. This determined that photoactivity enhancement of the NG is accounted for by acquisition of nitrogen-oxy-carbide phases that shared in inducing a higher IPCE% (60%) and a lower band gap value (1.68 eV) compared to boron and nitrogen–boron-codoped graphenes. The achieved photodegradation mechanism relied on scavengers performance suggesting that • OH and electrons were the main reactive species responsible for the MB photodegradation.

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Section: Results and Discussionmentioning

confidence: 99%

Nitrogen Graphene: A New and Exciting Generation of Visible Light Driven Photocatalyst and Energy Storage Application

et al. 2018

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“…The hollow porouss phere is as pecial functional material, due to its unique structure, whichh as become ap romising and attractive material for chemical catalysis, nanoreactors, drug delivery vehicles, and energy conversion and storage. [40][41][42][43][44][45][46] Nano-sized hollow porouss pheres can adjust the volume change in the catalytic process to increaset he structural stability.T herefore, hollow porousM nFe 2 O 4 spheres were prepared in presentw ork to obtain excellent HER and OER performance, and it was further optimized by growingo nt he surfaceo fb iochar.T he elm moneyh as meritorious physical and chemical properties because of its unique structure and natural carbon skeleton, which could afford many natural pores and facilitate the rapid transfer of electrolytes, and is beneficialt of aster release of air bubbles. [47][48][49] In this paper, MnFe 2 O 4 hollow porous sphere ande lm-money-derived biocharc omposites (MnFe 2 O 4 / BC) are obtained as dual-functional electrocatalysts for overall water decomposition.…”

Section: Introductionmentioning

confidence: 99%

Hollow Porous MnFe₂O₄ Sphere Grown on Elm‐Money‐Derived Biochar towards Energy‐Saving Full Water Electrolysis

Liu

Huo

Yan

et al. 2020

Chemistry A European J

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The development of inexpensive and efficient bifunctional electrocatalysts is significant for widespreadp ractical applications of overall water splittingt echnology. Herein,aone-pot solvothermal method is used to prepare hollow porousM nFe 2 O 4 spheres, which are grown on natural-abundant elm-money-derived biocharm aterial to construct MnFe 2 O 4 /BC composite. When the overpotential is 156 mV for both the oxygen evolution reaction and the hydrogen evolution reaction, the current density reaches up to 10 mA cm À2 ,a nd its duration is 10 h. At 1.51 V, the overall waterd ecomposition currentd ensity of 10 mA cm À2 can be obtained in 1 m KOH. This work proves that elm-money-derived biochar is av alid substrate for growingh ollow porous spheres.M nFe 2 O 4 /BC give ap romising general strategy for preparing the effective and stable bifunctional catalysis that can be expand to multiple transition metal oxide.

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“…The column temperature was adjusted at 40°C, and the injection volume was 3.0 μL. The retention time of naproxen was 7.5 min, and the related peak was monitored at the wavelength of 235 nm .…”

Section: Resultsmentioning

confidence: 99%

Visible Light Degradation of Naproxen by Enhanced Photocatalytic Activity of NiO and NiS, Scavenger Study and Focus on Catalyst Support and Magnetization

Torki

Faghihian

2018

Photochem & Photobiology

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This research was aimed to prepare a magnetically photocatalyst enabling to degrade pharmaceutical wastewater and detoxification of pollutant such as naproxen, by visible light irradiation. The nano-sized NiS and NiO photocatalysts exhibit higher reactivity than their microsized counterparts, but separation of the used photocatalyst from the degradation solution is hard and imperfect. To remove this difficulty, magnetic polypyrrole core-shell (Fe O @PPY) was synthesized and employed as catalyst support. The magnetization property of the synthesized photocatalysts measured by VSM technique indicated that the photocatalysts were sufficiently magnetized to be readily separated from degradation solution by use of external magnetic field. The DRS study showed that the band gap of the photocatalysts shifted to lower energy after immobilization on the support materials leading to higher degradation efficiency. The optimal efficiency was obtained with the catalysts loaded with 50% of NiO and 50% of NiS. The augmenting effect of H O and the inhibition influence of some organic and inorganic compounds on the degradation process were studied. Regeneration of the used photocatalyst was performed by heat treatment, and the catalyst treated at 400°C retained most of its initial capacity. The degradation capacity was kinetically fast, and the equilibrium was attained within 30 min.

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Rational design of manganese ferrite-graphene hybrid photocatalysts: Efficient water splitting and effective elimination of organic pollutants

Cited by 51 publications

References 54 publications

Nitrogen Graphene: A New and Exciting Generation of Visible Light Driven Photocatalyst and Energy Storage Application

Nitrogen Graphene: A New and Exciting Generation of Visible Light Driven Photocatalyst and Energy Storage Application

Hollow Porous MnFe₂O₄ Sphere Grown on Elm‐Money‐Derived Biochar towards Energy‐Saving Full Water Electrolysis

Visible Light Degradation of Naproxen by Enhanced Photocatalytic Activity of NiO and NiS, Scavenger Study and Focus on Catalyst Support and Magnetization

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Rational design of manganese ferrite-graphene hybrid photocatalysts: Efficient water splitting and effective elimination of organic pollutants

Cited by 51 publications

References 54 publications

Nitrogen Graphene: A New and Exciting Generation of Visible Light Driven Photocatalyst and Energy Storage Application

Nitrogen Graphene: A New and Exciting Generation of Visible Light Driven Photocatalyst and Energy Storage Application

Hollow Porous MnFe2O4 Sphere Grown on Elm‐Money‐Derived Biochar towards Energy‐Saving Full Water Electrolysis

Visible Light Degradation of Naproxen by Enhanced Photocatalytic Activity of NiO and NiS, Scavenger Study and Focus on Catalyst Support and Magnetization

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Hollow Porous MnFe₂O₄ Sphere Grown on Elm‐Money‐Derived Biochar towards Energy‐Saving Full Water Electrolysis