The role of mineral surface chemistry in modified dextrin adsorption

Beaussart, Audrey; Mierczyńska-Vasilev, Agnieszka; Harmer, Sarah L.; Beattie, David A.

doi:10.1016/j.jcis.2011.02.017

Cited by 15 publications

(2 citation statements)

References 52 publications

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“…This technique exploits hydrophobic attraction between the air bubbles and the hydrophobic particles to recycle low-grade valuable components in the raw ore or wastes. , More than one billion tons of ores are processed by flotation annually in the world . Enormous effort has been made to understand and to enhance the surface/interface processes of flotation. − The flotation collectors (surfactants) are usually used to improve the mineral surface hydrophobicity. , However, similar to other oxide minerals, such as mica, quartz, and scheelite, the cassiterite surface is strongly hydrophilic and gets hydrated easily. − Thus, the collector is difficult to adsorb effectively on the hydrated surface. The strategy of enhancing the surface activity by preadsorption of metal ions (so-called surface activation) is an effective way to promote the adsorption of surfactant on surface, which is very important in many surface process engineering.…”

Section: Introductionmentioning

confidence: 99%

Effects of Hydration on the Adsorption of Benzohydroxamic Acid on the Lead-Ion-Activated Cassiterite Surface: A DFT Study

Zhang

Yue

et al. 2021

Langmuir

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The strategy of enhancing the surface activity by preadsorption of metal ions (surface activation) is an effective way to promote the adsorption of surfactant on surfaces, which is very important in surface process engineering. However, the adsorption mechanism of surfactant (collector) on the surface preadsorbed by metal ions in the explicit solution phase is still poorly understood. Herein, the effects of hydration on the adsorption of benzohydroxamic acid (BHA) onto the oxide mineral surface before and after lead-ion activation are investigated by first-principles calculations, owing to its importance in the field of flotation. The results show that the direct adsorption of BHA on the hydrated surface is not thermodynamically allowed in the absence of metal ions. However, the adsorption of BHA onto the lead-ion-activated surface possesses a very low barrier and a very negative reaction energy difference, indicating that the adsorption of BHA on hydrated Pb2+ at cassiterite surface is very favorable in both thermodynamics and kinetics. In addition, the adsorption of BHA results in the dehydration of hydrated Pb2+. More interestingly, the surface hydroxyl groups could participate in and may promote the coordination adsorption through proton transfer. This work sheds some new lights on understanding the roles of interfacial water and the mechanisms of metal-ion surface activation.

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Section: Introductionmentioning

confidence: 99%

Effects of Hydration on the Adsorption of Benzohydroxamic Acid on the Lead-Ion-Activated Cassiterite Surface: A DFT Study

Zhang

Yue

et al. 2021

Langmuir

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“…Each contact angle was express as the angle between the solid and the air bubble for direct comparison. All Captive bubble contact angle experiments were performed using the Sinterface Profile Analysis Tensiometer PAT1 Version 8 (Sinterface, Berlin, Germany), and the contact angles from the images captured by the Sinterface PAT1 CCD camera were analysed using "ImageJ" imaging analysis software [43].…”

Section: Captive Bubble Contact Anglementioning

confidence: 99%

Surface Chemical Characterisation of Pyrite Exposed to Acidithiobacillus ferrooxidans and Associated Extracellular Polymeric Substances

et al. 2018

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A. ferrooxidans and their metabolic products have previously been explored as a viable alternative depressant of pyrite for froth flotation; however, the mechanism by which separation is achieved is not completely understood. Scanning electron microscopy (SEM), photoemission electron microscopy (PEEM), time-of-flight secondary ion mass spectrometry (ToF-SIMS) and captive bubble contact angle measurements have been used to examine the surface physicochemical properties of pyrite upon exposure to A. ferrooxidans grown in HH medium at pH 1.8. C K-edge near edge X-ray absorption fine structure (NEXAFS) spectra collected from PEEM images indicate hydrophilic lipids, fatty acids and biopolymers are formed at the mineral surface during early exposure. After 168 h, the spectra indicate a shift towards protein and DNA, corresponding to an increase in cell population and biofilm formation on the surface, as observed by SEM. The Fe Ledge NEXAFS show gradual oxidation of the mineral surface from Fe(II) sulfide to Fe(III) oxyhydroxides. The oxidation of the iron species at the pyrite surface is accelerated in the presence of A. ferrooxidans and extracellular polymeric substances (EPS) as compared to HH medium controls. The surface chemical changes induced by the interaction with A. ferrooxidans show a significant decrease in surface hydrophobicity within the first 2 h of exposure. The implications of these findings are the potential use of EPS produced during early attachment of A. ferrooxidans, as a depressant for bioflotation.

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Dissolubility and surface properties of a natural sphalerite in aqueous solution

Liu

Wen

Xian

et al. 2012

Mining, Metallurgy & Exploration

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The role of mineral surface chemistry in modified dextrin adsorption

Cited by 15 publications

References 52 publications

Effects of Hydration on the Adsorption of Benzohydroxamic Acid on the Lead-Ion-Activated Cassiterite Surface: A DFT Study

Effects of Hydration on the Adsorption of Benzohydroxamic Acid on the Lead-Ion-Activated Cassiterite Surface: A DFT Study

Surface Chemical Characterisation of Pyrite Exposed to Acidithiobacillus ferrooxidans and Associated Extracellular Polymeric Substances

Dissolubility and surface properties of a natural sphalerite in aqueous solution

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