Assessment of clay mineral selectivity for adsorption of aliphatic/aromatic humic acid fraction

El-Sayed, Mohamed E. A.; Khalaf, Moustafa M.R.; Gibson, Dennis; Rice, James A.

doi:10.1016/j.chemgeo.2019.02.034

Cited by 37 publications

(15 citation statements)

References 23 publications

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“…3a) despite the aromatic content deduced from table 1, which were lower in the 7-year SD. This observation could be attributed to a stronger stability in the 14-year SD as compared to the 7-year sample of the complexes between organic compounds and clay [6] or metal-oxyhydroxides [56] within the SD particles. Under very acidic conditions, the SUVA of the leached compounds was slightly higher than under natural pH conditions (around 1.5 and 0.5-1.0 respectively).…”

Section: Ph-dependent Characteristics Of Soluble Organic Compoundsmentioning

confidence: 98%

“…Depending of the SOM of origin, these molecules may exhibit different molecular sizes and chemical compositions, particularly with regards to their functional groups (aromatic rings, carboxylic acids, N-containing groups, etc.). Molecular fractionation using ultrafiltration [6,7] and UV-visible spectroscopy [8,9] have been used extensively to characterize the molecular weight (MW) and aromaticity of DOM. SUVA 254 , defined as the ratio between absorbance at a wavelength of 254 nm and dissolved organic carbon concentration, is a well-known indicator of DOM aromaticity.…”

Section: Introductionmentioning

confidence: 99%

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Influence of pH on the release of colloidal and dissolved organic matter from vertical flow constructed wetland surface sludge deposits

Banc¹,

Gautier²,

Blanc³

et al. 2021

Chemical Engineering Journal

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Section: Ph-dependent Characteristics Of Soluble Organic Compoundsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Influence of pH on the release of colloidal and dissolved organic matter from vertical flow constructed wetland surface sludge deposits

Banc¹,

Gautier²,

Blanc³

et al. 2021

Chemical Engineering Journal

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“…Humic acid is a chemically heterogeneous compound which contains both hydrophilic and hydrophobic molecules with numerous functional groups -for example, hydroxyl and carboxyl, phenolic and amino groups. Humic acid is mostly negatively charged due to deprotonation of the phenolic and carboxyl groups in aqueous solutions where environment is from weakly acidic to basic (Anirudhan, Suchithra, & Radhakrishnan, 2009;El-Sayed et al, 2019). (Zhu et al, 2018).…”

Section: Clay Minerals and Hs Composites For Pharmaceutical Treatmentmentioning

confidence: 99%

Clay minerals and humic substances as landfill closure covering material constituents: first studies

Burlakovs¹,

Pilecka-Ulcugaceva²,

Grīnfelde³

et al. 2020

Research for Rural Development

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Soil and groundwater as the leachate may contaminate surrounding watersheds, thus different pollutants from closed dumps and landfills pose significant risks to human health and ecology. Pollution may lead to soil and water degradation however it might be diminished through sustainable dump site closure projects and processual management. Several decades of clays and clay minerals studies lead to modified clay composites concept that is one of the potential promising solutions for building the landfill covering material and serve as capping biocover layer at the same time. As humic substances are constituents of soil organic matter, pollutants can be sorbed on the surfaces of complex molecules. This kind of humic acid-clay mineral composite materials thus might become as low cost building material component - covering material. Construction of such layer are to be performed as a combination of clay-humic composites and landfill mined fine fraction of waste with small amendment of natural soil. Several hypotheses that are already proven has to be mentioned: a) Clay minerals produce composites with humic substances; 2) Clay-humic complexes reduce through sorption both organic and inorganic pollutants; 3) Low risk of toxic byproducts from landfill mined waste fine fraction can be the problem; 4) Such composites mostly would trap toxic contaminants (e.g., pharmaceuticals) found in reworked fine fraction of waste. The aim of the work is to provide alternative solution for landfill closure by giving theoretical considerations from multidisciplinary knowledge of environmental engineering, chemistry and waste management.

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“…HA is commonly used in agriculture, medicine, health, and wastewater management (Santos et al, 2016). HA possess negative charge in aqueous solutions due to having carboxylic and phenolic groups (El-sayed et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Extraction and Characterization of Humic Acid from Agriculture Soil and Its Effect on Wheat (Triticum indicum) Seed Growth

Chandio¹,

Pirzada²,

Majid³

et al. 2021

SJA

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Assessment of clay mineral selectivity for adsorption of aliphatic/aromatic humic acid fraction

Cited by 37 publications

References 23 publications

Influence of pH on the release of colloidal and dissolved organic matter from vertical flow constructed wetland surface sludge deposits

Influence of pH on the release of colloidal and dissolved organic matter from vertical flow constructed wetland surface sludge deposits

Clay minerals and humic substances as landfill closure covering material constituents: first studies

Extraction and Characterization of Humic Acid from Agriculture Soil and Its Effect on Wheat (Triticum indicum) Seed Growth

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