Surface stoichiometry of zinc sulfide and its effect on the adsorption behaviors of xanthate

In this paper, the surface stoichiometry, acid-base properties as well as the adsorption of xanthate at ZnS surfaces were studied by means of potentiometric titration, adsorption and solution speciation modeling. The surface proton binding site was determined by using Gran plot to evaluate the poten...

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Bibliographic Details
Published in:BMC chemistry 2011-11, Vol.5 (1), p.73-73, Article 73
Main Authors: Wang, Meng, Zhang, Qi, Hao, Wei, Sun, Zhong-Xi
Format: Article
Language:English
Subjects:
Acids
Adsorption
Aqueous solutions
Binding sites
Chemical reactions
Chemistry
Chemistry and Materials Science
Chemistry/Food Science
Crystal structure
Hydroxides
Inorganic Chemistry
Mathematical models
Nanoparticles
Research Article
Stoichiometry
Surface charge
Surface chemistry
Titration
Zinc
Zinc sulfide
Zinc sulfides
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Summary:In this paper, the surface stoichiometry, acid-base properties as well as the adsorption of xanthate at ZnS surfaces were studied by means of potentiometric titration, adsorption and solution speciation modeling. The surface proton binding site was determined by using Gran plot to evaluate the potentiometric titration data. Testing results implied that for stoichiometric surfaces of zinc sulfide, the proton and hydroxide determine the surface charge. For the nonstoichiometric surfaces, the surface charge is controlled by proton, hydroxide, zinc and sulfide ions depending on specific conditions. The xanthate adsorption decreases with increasing solution pH, which indicates an ion exchange reaction at the surfaces. Based on experimental results, the surface protonation, deprotonation, stoichiometry and xanthate adsorption mechanism were discussed.
ISSN:1752-153X
1752-153X
2661-801X
DOI:10.1186/1752-153X-5-73