High surface area microporous carbons as photoreactors for the catalytic photodegradation of methylene blue under UV–vis irradiation

Matos, Juan; Fierro, Vanessa; Montaña, Ricmary; Rivero, Eliram; Yuso, Alicia Martínez de; Zhao, Wenxia

doi:10.1016/j.apcata.2016.02.031

Cited by 35 publications

(21 citation statements)

References 57 publications

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“…Figure b shows that the MB adsorption capacity of OSL‐py is 37 mg g −1 as derived from the Langmuir fit of the adsorption data, a value that is comparable to those reported for other sucrose and lignocellulose derived carbons ,. Nevertheless, this is a preliminary result that clearly leaves space for optimization by adjusting the sub‐optimal microstructure of OSL‐py in terms of increased mesopore volume . This can be achieved by modifying the KOH:biomass ratio during activation as well as by chemical or electro‐chemical post‐treatment of the activated carbon.…”

Section: Applications Of Biocharssupporting

confidence: 71%

“…[17,56] Nevertheless, this is a preliminary result that clearly leaves space for optimization by adjusting the sub-optimal microstructure of OSL-py in terms of increased mesopore volume. [57] This can be achieved by modifying the KOH:biomass ratio during activation as well as by chemical or electro-chemical post-treatment of the activated carbon. Besides, an advantage of the OSL biochar as adsorbent is its electrical conductivity, which can be beneficial in the future for the regeneration of the adsorbent material by electrochemical elimination of the adsorbed contaminant as shown by Canencia et al [17]…”

Section: Water Remediationmentioning

confidence: 99%

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Biorefinery of Lignocellulosic Biomass from an Elm Clone: Production of Fermentable Sugars and Lignin‐Derived Biochar for Energy and Environmental Applications

et al. 2018

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Valorization of lignocellulosic feedstock from a Dutch elm disease tolerant Ulmus minor clone was studied as a new biomass resource. Herein, fermentable sugars and activated carbons from the side‐stream lignins were produced. For the sugar extraction organosolv and acid hydrolysis pretreatments prior to enzymatic hydrolysis were compared for the first time for this clone prior to enzymatic hydrolysis; organosolv was more efficient for delignification (49 %), while acid hydrolysis was more efficient at eliminating hemicelluloses (95 %). A high final glucose concentration of 22–23.5 g L−1 was obtained after enzymatic hydrolysis suggesting that this clone can be considered a potential source for glucose‐based biofuel production. The side‐stream lignins were converted to microporous biochars of high surface area (1220 m2 g−1) and micropore volume (0.42 cm3 g−1). These biochars exhibited excellent properties as electrodes in supercapacitors with a specific capacitance of 118 F g−1 and a high energy density of 14 Wh kg−1 at 7000 W kg−1, while they were also efficient adsorbents in water remediation of model contaminants.

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Section: Applications Of Biocharssupporting

confidence: 71%

Section: Water Remediationmentioning

confidence: 99%

Biorefinery of Lignocellulosic Biomass from an Elm Clone: Production of Fermentable Sugars and Lignin‐Derived Biochar for Energy and Environmental Applications

et al. 2018

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“…Their electric properties depend on their oxidized/reduced states and the number and nature of their functional groups. Nevertheless, the photocatalytic activity of carbon nanostructures needs considerable further studies [19][20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

“…The origin of this phenomenon is said to be that they behave as semiconductors.Their electric properties depend on their oxidized/reduced states and the number and nature of their functional groups. Nevertheless, the photocatalytic activity of carbon nanostructures needs considerable further studies [19][20][21][22][23][24].There are several ways how photocatalytic oxide layers can be deposited on monolithic substrates as the aerogels (e.g. sol-gel synthesis, CVD, sputtering) [18].…”

mentioning

confidence: 99%

Photocatalytic properties of TiO2@polymer and TiO2@carbon aerogel composites prepared by atomic layer deposition

Justh

Mikula

Bakoš

et al. 2019

Carbon

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Monolithic structured TiO2/aerogel composites were prepared from resorcinol-formaldehyde polymer aerogel (RFA) and its carbon aerogel (RFCA) derivative. A resorcinol-formaldehyde hydrogel was synthesized in a sol-gel reaction and transformed into polymer aerogel by supercritical drying. The RFA was converted to carbon aerogel by pyrolysis at 900 °C in dry N2.Amorphous and crystalline TiO2 layers were grown from TiCl4 and H2O precursors by atomic layer deposition (ALD) at 80 °C and 250 °C, respectively, on both RFA and RFCA. The substrates and the composites were studied by N2 adsorption, TG/DTA-MS, Raman, SEM-EDX and TEM techniques. Their photocatalytic activity was compared in the UV catalyzed decomposition reaction of methyl orange dye. Keywordsresorcinol-formaldehyde polymer aerogel, carbon aerogel, photocatalysis, ALD, TiO2 IntroductionBeside crystalline carbonaceous nanomaterials such as fullerene, graphene, graphene oxide, nanodiamond, carbon nanospheres, carbon nanotubes; mesoporous carbon aerogels have attracted a great deal of attention. Carbon aerogels, available also in monolithic form, have several favorable properties, for example they can be used as adsorbents or as substrates for catalysts, because of their robustness and high specific surface area [1,2]. They are also excellent thermal and phonic insulators, while conduct electricity. These properties can be tuned through their synthesis conditions. [3][4][5][6][7] Resorcinol-formaldehyde (RF) organic aerogels, that Pekala and co-workers synthetized for the first time [8], undergo two main stages during preparation. In the first stage a hydrogel is prepared by a sol-gel process and in the second stage after drying the aerogel is obtained. The resorcinol-formaldehyde polymer aerogel becomes a carbon aerogel in a consecutive third stage, which is carbonization occasionally followed by activation. Depending on the conditions carbonization or activation influence the structural and performance characteristics, like the specific surface area, significantly [9][10][11][12].Photocatalytic carbon nanocomposites have great potential in the field of environmental remediation, water splitting and self-cleaning surfaces [13,14]. Among the various semiconductor oxide photocatalysts TiO2 is researched widely, due to being stable and nontoxic. TiO2 has ideal band gap width for the half reactions of water splitting and its composites with other nanomaterials, such as carbon nanostructures, may enhance the photocatalytic activity. However, its use still faces some difficulties, such as a narrow light response range limited to UV. The carbon nanostructure inhibits the recombination by promoting the charge separation as an electron acceptor. This effect and the widening of the wavelength response range through Ti-O-C bonds as well as modifying the photocatalytic selectivity are three advantages of TiO2 composites [3,[15][16][17][18]. Moreover, a number of studies indicates that nanoporous or nanostructured carbon materials, such as activated carbon or graphene-oxide...

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“…The adsorbed pollutant located on the surface of the activated carbon can migrates continuously to support photocatalytic activity . In the second step, several functional groups on AC surface are able to excite the electrons (e − ) from the valence band to the conduction band of AgNPs (eqn 6),,− and creating a hole (h + ) in the valence band. These holes were trapped on the surface of the hydroxyl group to furnish OH ions radicals (eqn 7 and 8).…”

Section: Results Of Discussionmentioning

confidence: 99%

AgNPs-AC Composite for Effective Removal (Degradation) of Napthol Green B Dye from Aqueous Solution

Devi

Ahmaruzzaman

2017

ChemistrySelect

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The main objective of this study is to remove toxic dyes, such as Napthol green B (NGB) from aqueous solution. The synthesized Ag‐AC composite showed an excellent photocatalytic activity for the removal of such toxic dye (Napthol green B) under solar irradiation. The Ag‐AC composite was prepared by chemical precipitation method. Here, biological waste material (Coccinia grandis peel) was used for the synthesis of composite and activated carbon was prepared from waste biomass material (saw dust). The AgNPs was synthesized using Coccinia grandis peel extract. In the present study, the photocatalytic activities of synthesized AgNPs were investigated. From the photocatalytic studies, it was observed that Ag‐AC composite showed better catalytic activity than that of pure AgNPs. This may be explained because of the dual properties of AC. The adsorption property of NGB dye was also studied using Ag‐AC composite. From the adsorption study it was observed that only 40% of dye adsorbed within 1 h but in photodegrdation process 97% of dye was degraded within 1 h. Hence it was confirmed that photodegradation process was better than adsorption process for the removal of toxic dye. The probable mechanism action of Ag‐AC composite and degraded by‐products of dye during photodegradation was also discussed in this article. It was for the first time, we report the catalytic behavior of AgNPs and Ag‐AC composite as a photocatalyst for the degradation of NGB dye.

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High surface area microporous carbons as photoreactors for the catalytic photodegradation of methylene blue under UV–vis irradiation

Cited by 35 publications

References 57 publications

Biorefinery of Lignocellulosic Biomass from an Elm Clone: Production of Fermentable Sugars and Lignin‐Derived Biochar for Energy and Environmental Applications

Biorefinery of Lignocellulosic Biomass from an Elm Clone: Production of Fermentable Sugars and Lignin‐Derived Biochar for Energy and Environmental Applications

Photocatalytic properties of TiO2@polymer and TiO2@carbon aerogel composites prepared by atomic layer deposition

AgNPs-AC Composite for Effective Removal (Degradation) of Napthol Green B Dye from Aqueous Solution

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