Colloid Geochemistry of Clay Minerals

Yariv, S.; Cross, Harold

doi:10.1007/978-3-642-67041-1_8

Cited by 8 publications

(5 citation statements)

References 100 publications

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“…It should be noted, however, that perlite is in principle a negatively charged aluminosilicate (unbound terminal –SiO – groups and isomorphous substitutions) and that the balancing cations are very labile, i.e., easily exchangeable. Thus, adsorption of AB 1 in patches onto perlite unravels, besides the structural diversity, the charge heterogeneity in perlite possibly accompanying the “broken-bond” or “edge” existing surfaces where the unsatisfied atoms may bring positive charges (Yariv & Cross, 1979 ).…”

Section: Resultsmentioning

confidence: 99%

C.I. Acid Black 1 transfer from dilute solution to perlite framework in organic waste management

Roulia,

Vassiliadis

2024

Environ Geochem Health

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Dyes, considered as toxic and persistent pollutants, must be removed from organic wastes prior to their composting and application in sustainable agriculture. Azo dyes, capable of altering the physicochemical properties of soil, are difficult to expel by conventional wastewater treatments. C.I. Acid Black 1 (AB 1), a sulfonated azo dye, inhibits nitrification and ammonification in the soil, lessens the nitrogen use efficacy in crop production and passes substantially unaltered through an activated sludge process. The retention of C.I. Acid Black 1 by raw and expanded perlite was investigated in order to examine the potential effectiveness of this aluminosilicate material toward organic waste cleanup. Dye adsorption proved spontaneous and endothermic in nature, increasing with temperature for both perlites. Expanded perlite having a more open structure exhibited a better performance compared to the raw material. Several of the most widely recognized two-parameter theoretical models, i.e., Langmuir, Freundlich, Temkin, Brunauer–Emmett–Teller (BET), Harkins–Jura, Halsey, Henderson, and Smith, were applied to reveal physicochemical features characterizing the adsorption. The Langmuir, Freundlich, Temkin, BET, Henderson, and Smith equations best fitted experimental data indicating that the adsorption of anionic dye on perlites is controlled by their surface, i.e., non-uniformity in structure and charge. This heterogeneity of surface is considered responsible for promoting specific dye adsorption areas creating dye “islands” with local dye supersaturations.

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Section: Resultsmentioning

confidence: 99%

C.I. Acid Black 1 transfer from dilute solution to perlite framework in organic waste management

Roulia,

Vassiliadis

2024

Environ Geochem Health

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“…In addition, negative surface charge in layers may be accounted for by broken bonds at the edges of the sheets, on noncleavage surfaces [ 117 ]. This second source of charge is generally negative and pH dependent [ 21 ].…”

Section: Natural Mineral Catalystsmentioning

confidence: 99%

“…This second source of charge is generally negative and pH dependent [ 21 ]. The unsatisfied charges may be balanced by the sorption of cations and anions, either specifically by chemisorption or nonspecifically by electrostatic attraction, the latter ions being easily exchangeable [ 117 ].…”

Section: Natural Mineral Catalystsmentioning

confidence: 99%

Clay, Zeolite and Oxide Minerals: Natural Catalytic Materials for the Ozonation of Organic Pollutants

Inchaurrondo

Font

2022

Molecules

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Ozone has been successfully employed in water treatment due to its ability to oxidize a wide variety of refractory compounds. In order to increase the process efficiency and optimize its economy, the implementation of heterogeneous catalysts has been encouraged. In this context, the use of cheap and widely available natural materials is a promising option that would promote the utilization of ozone in a cost-effective water treatment process. This review describes the use of natural clays, zeolites and oxides as supports or active catalysts in the ozonation process, with emphasis on the structural characteristics and modifications performed in the raw natural materials; the catalytic oxidation mechanism; effect of the operating parameters and degradation efficiency outcomes. According to the information compiled, more research in realistic scenarios is needed (i.e., real wastewater matrix or continuous operation in pilot scale) in order to transfer this technology to the treatment of real wastewater streams.

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“…are the well-studied phyllosilicate minerals in different fields. Because the Al atoms in pyrophyllite exist within the structure of the octahedral sheet, they do not appear on cleavage surfaces during grinding in mill (Yariv and Cross, 1979). Cleavage occurs between two tetrahedral sheets in adjacent layers, resulting in lower free energy on the exposed surface of the ground pyrophyllite particles and increased hydrophobicity of the particles (Newton and Sposito, 2015).…”

Section: Introductionmentioning

confidence: 99%

Flotation of Smithsonite From Quartz Using Pyrophyllite Nanoparticles as the Natural Non-toxic Collector

2021

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The use of natural hydrophobic mineral nanoparticles as a collector in froth flotation has recently attracted the attention of researchers. In this article, the separation performance and mechanism of pyrophyllite nanoparticles (PNPs) on smithsonite and quartz flotation system were investigated using the method of flotation, zeta potential, contact angle, and scanning electron microscope (SEM)/energy disperse spectroscopy (EDS). The results of single mineral flotation showed that the difference in flotation recovery between smithsonite and quartz was large for NaOL, DDA, and PNP collectors in the acidic pH range, the largest of which was the PNP system. At pH 6, the optimal dosage of PNPs was 1,000 mg/L. Separation of mixed minerals of smithsonite and quartz using a PNP collector provides the optimum concentrate index (Zn grade 50.84% and Zn recovery 85.36%). According to the results of zeta potential measurement, PNPs and quartz were negatively charged, and the surface of smithsonite was positively charged at pH 6. This provided conditions for smithsonite to selectively adsorb PNPs due to different electrostatic forces. Selective adsorption of PNPs in the smithsonite/quartz flotation system was directly observed by SEM/EDS detection. Hydrophobic PNPs were adsorbed on the surface of hydrophilic smithsonite to make it hydrophobic, and the surface of quartz remained hydrophilic. This is the mechanism for separating smithsonite and quartz using PNPs.

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Colloid Geochemistry of Clay Minerals

Cited by 8 publications

References 100 publications

C.I. Acid Black 1 transfer from dilute solution to perlite framework in organic waste management

C.I. Acid Black 1 transfer from dilute solution to perlite framework in organic waste management

Clay, Zeolite and Oxide Minerals: Natural Catalytic Materials for the Ozonation of Organic Pollutants

Flotation of Smithsonite From Quartz Using Pyrophyllite Nanoparticles as the Natural Non-toxic Collector

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