Characterization of adsorption removal of hydrogen sulfide by waste biocover soil, an alternative landfill cover

He, Ruo; Xia, Fangfang; Wang, Jing; Pan, Chang-Liang; Fang, Chengran

doi:10.1016/j.jhazmat.2010.11.062

Cited by 55 publications

(23 citation statements)

References 33 publications

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“…First, H 2 S can be absorbed by the water film. 51 Furthermore, hydroxylation occurs on the surface of ZnO in contact with the liquid water film, which in turn leads to gradual alkalinification of the water film. 52,53 Basic conditions can trigger the dissociation of dissolved H 2 S into HS − and S 2− .…”

Section: Resultsmentioning

confidence: 99%

Design of a Sorbent to Enhance Reactive Adsorption of Hydrogen Sulfide

Wang

Fan

et al. 2014

ACS Appl. Mater. Interfaces

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A series of novel zinc oxide-silica composites with three-dimensionally ordered macropores (3DOM) structure were synthesized via colloidal crystal template method and used as sorbents for hydrogen sulfide (H2S) removal at room temperature for the first time. The performances of the prepared sorbents were evaluated by dynamic breakthrough testing. The materials were characterized before and after adsorption using scanning electron microscopy (SEM), transmission electron microscopy (TEM), nitrogen adsorption, X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy and X-ray photoelectron spectroscopy (XPS). It was found that the composite with 3DOM structure exhibited remarkable desulfurization performance at room temperature and the enhancement of reactive adsorption of hydrogen sulfide was attributed to the unique structure features of 3DOM composites; high surface areas, nanocrystalline ZnO and the well-ordered interconnected macroporous with abundant mesopores. The introduction of silica could be conducive to support the 3DOM structure and the high dispersion of zinc oxide. Moisture in the H2S stream plays a crucial role in the removal process. The effects of Zn/Si ratio and the calcination temperature of 3DOM composites on H2S removal were studied. It demonstrated that the highest content of ZnO could reach up to 73 wt % and the optimum calcination temperature was 500 °C. The multiple adsorption/regeneration cycles showed that the 3DOM ZnO-SiO2 sorbent is stable and the sulfur capacity can still reach 67.4% of that of the fresh sorbent at the fifth cycle. These results indicate that 3DOM ZnO-SiO2 composites will be a promising sorbent for H2S removal at room temperature.

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Section: Resultsmentioning

confidence: 99%

Design of a Sorbent to Enhance Reactive Adsorption of Hydrogen Sulfide

Wang

Fan

et al. 2014

ACS Appl. Mater. Interfaces

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“…When the content of humidity in materials significantly increases, the specific odour emissions also increase. The increased emission of hydrogen sulphide at a higher humidity of the ambient air was identified by [8]. At higher temperature water vapour pressure grows, which deteriorates the adsorption properties of the filler resulting in more intensive emissions of H 2 S. Fig.…”

Section: Research Resultsmentioning

confidence: 91%

“…It has been determined that the capacity of compost to adsorb hydrogen sulphide increases when the size of particles and acidity decrease and the content of humidity increases [8]. The optimum adsorption of H 2 S is achieved by the compost with the size of particles below 4 mm, natural pH and 40% humidity content.…”

Section: Introductionmentioning

confidence: 99%

Experimental Tests on the Influence of Waste Covering Layer on Odour Reduction

Vasarevičius¹,

Batavičius²

2013

Ecological Chemistry and Engineering S

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Abstract:Waste management is one of the most relevant problems of environmental protection. Landfills constitute an unavoidable component of the waste management system. The article discusses the problem of landfill odours. Reduction of waste tipping areas and temporary waste covering are the most efficient measures for reducing odours from landfills. The article presents the results of experimental tests on the use of building debris for the reduction of odours from landfills. Tests were performed by applying dynamic olfactometry. Upon covering waste with the building debris layer of 10 cm thickness odour thresholds fell from 51.0 to 79.7% compared with uncovered waste.

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“…Toluene is a volatile compound that easily evaporates, and the moisture content in R1 fell from 50.3 % to 48.1 % and the moisture content in R3 fell from 50.2% to 47.2%. The volatilization process of toluene may have helped H 2 S (g) be released into the headspace, and the decrease of the moisture content would result in the decrease about the ability of adsorbing H 2 S to solid material (He et al, 2011), which could have caused its concentration in the headspace to increase. Thus, the concentration of H 2 S in R1 and R3 are a bit higher.…”

Section: H 2 S (Aq) 4 H 2 S (G)mentioning

confidence: 99%