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The influence of chemical modification on the CO2plus ion sorption process by anaerobic sludge

100%

Fristak V., Valovciakova M., Pipiska M., Lesny J.

Polish Journal of Environmental Studies

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2014

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tom 23

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nr 3

Modification by chemical agents affected the sorption capacities of sludge from municipal wastewater treatment plants (WWTPs). We tried to characterize changes in sorption capacity of dried anaerobic sludge (DANS) after chemical modification by formaldehyde, methanol, and hydrochloric acid. Modified sludges were characterized by FT-IR spectroscopy, cation exchange capacity, and electrothermal atomic absorption spectrometry (ETAAS) analysis. Maximum sorption capacities Qmax at pH 6.0 for Co²⁺ ions calculated from Langmuir isotherm model were 175±5 μmol/g for unmodified DANS, 170±2 μmol/g for CH₂O-modified DANS, 12±0.2 μmol/g for CH₃OH-modified DANS, and 15±0.3 μmol/g for HCl-modified DANS. Our paper established the crucial role of carboxyl functional groups against amino and hydroxyl groups in sorption process of cobalt ions.

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Studies of competitive Cu2plus, Co2plus and Cr3plus sorption in grey-brown podzolic soils

84%

Paszko T.

Polish Journal of Environmental Studies

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2003

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tom 12

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nr 4

Studies of competitive sorption were carried out using the three-component solution CuCl2, CoCl2 and CrCl3 in two grey-brown podzolic soils saturated with Ca2+ cations. In most cases in batch experiments the Freundlich equation was the best to describe the sorption process. The linear sorption equation was success-fully applied to describe Cr3+ and Cu2+ sorption in column experiments. A significant effect of Cu2+ and Cr3+ on Co2+ sorption was found in both column and batch experiments. Sorption of ions of the studied heavy metals was not equivalent to Ca2+ desorption from soil.

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Impact of comminution on adsorption properties of gluten-free wheat starch

67%

Ocieczek A.

Acta Agrophysica

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2013

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tom 20

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nr 1

The process of grinding of wheat grain endosperm leads to damage of the starch fraction. Starch damage in wheat flour changes its water absorption. Intact starch absorbs water in the amount of 70% of its mass, and damaged granules have up to 3-fold higher level of absorption, which is conditioned by the increased number of small crystalline structures and damage to many crystalline structures. These changes cause an increase of the volumetric water absorption capacity and it can be assumed that this will be reflected in the surface microstructure of starch particles that affect the adsorption of water vapour. The aim of the study was to evaluate the impact of comminu-tion of gluten-free wheat starch on the adsorption properties of its granules. The study included the determination of adsorption isotherms of water vapour at 20°C with the static-desiccator method and the determination of adsorption parameters and microstructure of starch granule surface based on the GAB and Kelvin equations. The results confirmed the positive impact of mechanical processing on the capacity of surface water vapour adsorption by starch granules and this was indicated by a significantly diversified distribution of adsorption isotherms, surface adsorption parameters and parameters of microstructure of molecules on which adsorption was tested.

Ograniczanie wyników

2 Polish Journal of Environmental Studies

1 Acta Agrophysica

1 Fristak V.

1 Lesny J.

1 Ocieczek A.

1 Paszko T.

1 Pipiska M.

1 Valovciakova M.

1 2014

1 2013

1 2003

The influence of chemical modification on the CO2plus ion sorption process by anaerobic sludge

Studies of competitive Cu2plus, Co2plus and Cr3plus sorption in grey-brown podzolic soils

Impact of comminution on adsorption properties of gluten-free wheat starch