Adsorption of Hydrogen Sulfide onto Activated Carbon Fibers:  Effect of Pore Structure and Surface Chemistry

Feng, Wenguo; Kwon, Sung Youn; Borguet, Eric; Vidic, Radisav D.

doi:10.1021/es0507158

Cited by 163 publications

(89 citation statements)

References 34 publications

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“…These structures are known to be active sites for H 2 S adsorption [57] and contributed to the high removal capacity of ac.UWP. The two pyrolysis chars had significantly different physicochemical properties which were simultaneously modified during oxygenation and steam activation processes.…”

Section: −1mentioning

confidence: 99%

H2S removal from syngas using wastes pyrolysis chars

Hervy

Minh

Gérente

et al. 2018

Chemical Engineering Journal

105

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A B S T R A C TPyrolysis chars from wastes were investigated as sorbents for H 2 S removal from syngas. The H 2 S removal tests were performed at ambient temperature in various dry gas matrices (N 2 , Air, Syngas) to study the effect of the gas composition on the adsorption efficiency. Two chars were produced by the pyrolysis of: used wood pallets (UWP), and a 50/50% mixture of food waste (FW) and coagulation-flocculation sludge (CFS). The chars were functionalized by low-cost processes without chemicals: gas phase oxygenation and steam activation. Activated chars were the most efficient materials due to their large specific surface area, alkaline pH, basic O-containing groups and structural defects in graphene-like sheets. Raman analysis evidenced that inherent mineral species (especially Ca and Fe) increased the H 2 S removal efficiency by promoting the formation of metal sulfide and metal sulphate species at the char surface. Mesopores lower than 70 Å were revealed to be important adsorption sites. Under dry Syngas matrix, the chars remained efficient and selective toward H 2 S removal despite the presence of CO 2 , while O 2 in the Air matrix decreased their removal capacity due to the formation of sulfur acid species. The most efficient material was the steam activated char from FW/CFS, with a removal capacity of 65 mg H2S .g −1 under dry syngas. This char was proved to be completely regenerated with a thermal treatment under N 2 at 750°C. This study demonstrated that activated chars from food waste and sludge could be used as eco-friendly, affordable, and selective materials for syngas desulfurization even under dry atmosphere.

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Section: −1mentioning

confidence: 99%

H2S removal from syngas using wastes pyrolysis chars

Hervy

Minh

Gérente

et al. 2018

Chemical Engineering Journal

105

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“…The main premises in favor of undertaking the adsorption study toward gas pollutants of acidic nature were the high content of mineral substance in the activated carbons structure as well as the presence of a high number of basic surface functional groups, which, according to previous literature reports, have a positive impact on the effectiveness of removal of this type of pollution (Yuan and Bandosz 2007;Feng et al 2005;Nowicki et al 2013Nowicki et al , 2014Kante et al 2012). To verify this supposition, all the materials prepared were subjected to adsorption tests in four variants.…”

Section: Sorption Abilities Of the Activated Carbons Toward Nitrogen mentioning

confidence: 99%

The effect of mineral matter on the physicochemical and sorption properties of brown coal-based activated carbons

Nowicki

2015

Adsorption

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A series of new carbonaceous adsorbents has been obtained by means of direct and physical activation of Polish brown coal, characterised by high mineral matter content. The influence of activation procedure on the porous structure development, acidic and basic surface groups generation as well as the sorptive properties of the adsorbents prepared toward liquid and gas pollutants was tested. Additionally the effect of mineral matter presence on the physicochemical and sorption properties of materials prepared was studied. The final products were micro/mesoporous activated carbons of medium developed surface area ranging from 407 to 674 m 2 /g, showing strongly basic or intermediate acidic-basic character of the surface. The results obtained during this study showed that direct and physical activation of low quality brown coal led to activated carbons with very good sorption capacity both toward gas contamination of acidic character (especially nitrogen dioxide) as well as toward methylene blue and inorganic pollutants of molecules of size similar to that of iodine molecules. It was also proved that demineralization of prepared activated carbons by hydrochloric acid significantly reduced their ability to toxic gases sorption, but simultaneously increased the efficiency of removing impurities from the liquid phase.

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“…In fact, mixing Fe 0 -H 2 O systems is mostly considered as an important tool to facilitate the transport of contaminants from the solution to the surface of Fe 0 materials. However, in contrast to inert materials such as activated carbon [58][59][60], Fe 0 dissolves in aqueous solutions [e.g. 29,30,61] and the dissolution is increased by any mixing procedure [57,62], yielding more corrosion products.…”

Section: Implications For Fe 0 Reactive Wallsmentioning

confidence: 99%

A CRITICAL REVIEW ON THE PROCESS OF CONTAMINANT REMOVAL IN FE⁰–H₂O SYSTEMS

Noubactep¹

2008

Environmental Technology

344

308

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A central aspect of the contaminant removal by elemental iron materials (Fe 0 or Fe 0 materials) is that reduction reactions are mediated by the iron surface (direct reduction). This premise was introduced by the pioneers of the reactive wall technology and is widely accepted by the scientific community. In the meantime enough evidence has been provided to suggest that contaminant reduction through primary corrosion products (secondary reductants) does indeed occur (indirect reduction). It was shown for decades that iron corrosion in the pH range of natural waters (4-9) inevitably yields an obstructive oxide film of corrosion products at the metal surface (oxide film). Therefore, contaminant adsorption on to corrosion products and contaminant co-precipitation with corrosion products inevitably occurs. For adsorbed and coprecipitated contaminants to be directly reduced the oxide film should be electronic conductive. This study argues through a literature review a series of points which ultimately lead to the conclusion that, if any quantitative contaminant reduction occurs in the presence of Fe 0 materials, it takes place within the matrix of corrosion products and is not necessarily a direct reduction. It is concluded that Fe 0 materials act both as source of corrosion products for contaminant adsorption/coprecipitation and as a generator of Fe II and H 2 (H) for possible catalytic contaminant reduction.

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Adsorption of Hydrogen Sulfide onto Activated Carbon Fibers: Effect of Pore Structure and Surface Chemistry

Cited by 163 publications

References 34 publications

H2S removal from syngas using wastes pyrolysis chars

H2S removal from syngas using wastes pyrolysis chars

The effect of mineral matter on the physicochemical and sorption properties of brown coal-based activated carbons

A CRITICAL REVIEW ON THE PROCESS OF CONTAMINANT REMOVAL IN FE⁰–H₂O SYSTEMS

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Adsorption of Hydrogen Sulfide onto Activated Carbon Fibers: Effect of Pore Structure and Surface Chemistry

Cited by 163 publications

References 34 publications

H2S removal from syngas using wastes pyrolysis chars

H2S removal from syngas using wastes pyrolysis chars

The effect of mineral matter on the physicochemical and sorption properties of brown coal-based activated carbons

A CRITICAL REVIEW ON THE PROCESS OF CONTAMINANT REMOVAL IN FE0–H2O SYSTEMS

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A CRITICAL REVIEW ON THE PROCESS OF CONTAMINANT REMOVAL IN FE⁰–H₂O SYSTEMS