Adsorption of corn starch molecules at hydrophobic mineral surfaces

Shrimali, Kaustubh; Atluri, Venkata; Wang, Xuming

doi:10.1016/j.colsurfa.2018.03.001

Cited by 27 publications

(9 citation statements)

References 38 publications

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“…Similar adsorption mechanisms have also been reported for other organic depressants on the oxidized pyrite surface [43,44]. surfaces [40][41][42]. Zeta potential measurements and infrared spectral analysis indicated the presence of surface oxidation species on the pyrrhotite surface.…”

Section: Infrared Spectroscopysupporting

confidence: 77%

“…The elemental concentration and the changes in the binding energies of elements after the reaction with PGA are shown in Tables 3 and 4, respectively. surfaces [40][41][42]. Zeta potential measurements and infrared spectral analysis indicated the presence of surface oxidation species on the pyrrhotite surface.…”

Section: X-ray Photoelectron Spectroscopymentioning

confidence: 95%

“…Polyglutamic acid is one of the categories of polysaccharide-based polymers whose adsorption behavior depends essentially on the extent of hydroxyl metal species present on the mineral surfaces [40][41][42]. Zeta potential measurements and infrared spectral analysis indicated the presence of surface oxidation species on the pyrrhotite surface.…”

Section: Infrared Spectroscopymentioning

confidence: 99%

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The Depression and Adsorption Mechanism of Polyglutamic Acid on Chalcopyrite and Pyrrhotite Flotation Systems

et al. 2019

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The rejection of pyrrhotite and pyrite has become a long-standing problem in the copper ore industry. This paper describes the first successful depression and adsorption mechanism of a novel and non-hazardous reagent, polyglutamic acid (PGA), on pyrrhotite in the selective flotation of chalcopyrite with xanthate as the collector, making use of various laboratory-scale measurement techniques. The addition of PGA inhibited the flotation of pyrrhotite much more strongly than that of the chalcopyrite in a wide pH range. The prior addition of PGA achieved an improved selective flotation of chalcopyrite from pyrrhotite at pH 8, at which the grade and recovery of chalcopyrite in concentrate were over 80%. Surface measurement techniques including XPS spectral, IR spectral, zeta potential, and reagent adsorption analyses indicated that the PGA interacted differently with the two minerals, and had much greater affinity towards pyrrhotite than chalcopyrite. The presence of PGA blocked the electrochemical activity of the collector on the pyrrhotite surface and thus depressed its flotation, whereas the adsorption of the collector and its oxidation to dixanthogen were more effective on the chalcopyrite surface, indicating a weaker interaction of PGA with chalcopyrite. Our results suggest that the application of PGA could replace the toxic inorganic depressants in flotation technology, and could significantly reduce the environmental impacts of processing.

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Section: Infrared Spectroscopysupporting

confidence: 77%

Section: X-ray Photoelectron Spectroscopymentioning

confidence: 95%

Section: Infrared Spectroscopymentioning

confidence: 99%

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The Depression and Adsorption Mechanism of Polyglutamic Acid on Chalcopyrite and Pyrrhotite Flotation Systems

et al. 2019

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“…Tolstoguzov (1999Tolstoguzov ( , 2003 coined the term "molecular mimicry" to describe such capability. This capability is consistent with starch's ability to serve as a medium for the distribution of highly hydrophobic nanoparticles (Chen et al 2017) and to adsorb onto hydrophobic mineral surfaces (Shrimali et al 2018).…”

Section: Development Of Hydrophobic Effects Wettability Characteristics Of Starchsupporting

confidence: 71%

“…Lichtenthaler 2000; Roy et al 2015;Chen et al 2017;Shrimali et al 2018 A degree of self-association of the hydrophobic copolymers also plays a role in the distribution of the mixture of starch and hydrophobic copolymer.…”

Section: Hypothesis Statementsmentioning

confidence: 99%

Hydrophobic copolymers added with starch at the size press of a paper machine: A review of findings and likely mechanisms

Dal

Hubbe

2020

BioRes

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This article reviews publications with the goal of understanding the role of hydrophobic copolymers added to size-press starch as a means to make paper products more resistant to penetration by aqueous fluids. The underlying technology is considered, including background related to starch, size-press equipment, and various hydrophobic copolymers and latex products that have been evaluated. The resulting hydrophobization of the paper has been reported to depend not only on the dosage of the hydrophobic additive, but also on its molecular mass and ionic form. The mechanism appears to rely on an ability of starch to serve as a temporary host for hydrophobic compounds in aqueous solution. It has been proposed that hydrophobic copolymers added with size press starch tend to migrate to the air interface during drying of the starch film, thus allowing the low-energy functional groups, such as styrene or alkyl chains, to face outwards. Further research is needed to address various mechanistic questions. There may be opportunities to further raise the performance of this type of technology as practiced within paper production factories.

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The Influence of Polysaccharides on Film Stability and Bubble Attachment at the Talc Surface

Atluri

Gao

Wang

et al. 2018

Mining, Metallurgy & Exploration

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Adsorption of corn starch molecules at hydrophobic mineral surfaces

Cited by 27 publications

References 38 publications

The Depression and Adsorption Mechanism of Polyglutamic Acid on Chalcopyrite and Pyrrhotite Flotation Systems

The Depression and Adsorption Mechanism of Polyglutamic Acid on Chalcopyrite and Pyrrhotite Flotation Systems

Hydrophobic copolymers added with starch at the size press of a paper machine: A review of findings and likely mechanisms

The Influence of Polysaccharides on Film Stability and Bubble Attachment at the Talc Surface

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