Journal
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Volume 506, Issue -, Pages 431-437Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.colsurfa.2016.06.046
Keywords
Rutile; Lead ion; Adsorption; Flotation
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Funding
- Ministry of Land and Resources, China [201511063-2]
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The adsorption of Pb2+ at the rutile/water interface has been studied for the activation of rutile flotation with salicyl hydroxamic acid (SHA) as a collector in this work. This study was performed through measurement of the zeta potential, adsorption capacity, calorimetry and X-ray photoelectron spectroscopy. The experimental results showed that the adsorption of SHA on rutile and the flotability of rutile were significantly improved by the addition of Pb2+. This improvement was attributed to the specific adsorption of Pb2+ in the form of PbOH+, which interacted with the Ti-OH at the rutile surface and formed a surface Ti-O-Pb+ complex. This adsorption followed the Langmuir model. It reversed the zeta potential sign of rutile at pH 5.5-6.8 and had a heat of adsorption of-46.71 kJ/mol, suggesting the occurrence of a chemiosorptive process. (C) 2016 Elsevier B.V. All rights reserved.
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