Characterization of Lin'an montmorillonite and its application in the removal of Ni2+ from aqueous solutions
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X. L. Tan
Summary
Clay minerals have been studied extensively because of their strong sorption and complexation ability. In this work, Na-montmorillonite was characterized by using acid-base titration, XRD and FTIR in detail. Sorption of Ni(II) on Na-montmorillonite was investigated under ambient conditions as a function of pH, ionic strength, and temperature. The results indicate that sorption of Ni2+ on montmorillonite are strongly dependent on pH and ionic strength. The sorption of Ni2+ is mainly dominated by ion exchange at low pH values and by inner-sphere surface complexation at high pH values. The relationships of pH–Ceq, Q–Ceq and pH–Q are compared and shown clearly in a 3-D plot, and all Q–Ceq data lie in a straight line with slope (−V/m) and intercept (C0V/m). The thermodynamic parameters (ΔH°, ΔS°, and ΔG°) are calculated from the temperature dependent sorption isotherms, and the results suggest that the sorption reaction of Ni(II) from solution to montmorillonite is endothermic and spontaneous.
© Oldenbourg Wissenschaftsverlag
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Articles in the same Issue
- Precise isotope ratio measurements by MC-ICP-MS and application of the isotope dilution technique for the determination of germanium in the Gallium Neutrino Observatory
- Search for the “missing” α-decay branch in 239Cm
- Cross sections of proton induced nuclear reactions on natural cadmium leading to the formation of radionuclides of indium
- Comparative studies on the dissolution of ceramic UO2 pellets in nitric acid by microwave and conventional heating
- Selenide retention onto pyrite under reducing conditions
- Kinetics and thermodynamics of adsorption of trace amount of uranium on activated carbon
- Characterization of Lin'an montmorillonite and its application in the removal of Ni2+ from aqueous solutions
- Effect of ozone on ruthenium species in alkaline medium – Part III: Oxidative dissolution of ruthenium deposits onto stainless steel
- Computer-aided design of new metal binders
