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Temperature Effects on Nickel Sorption Kinetics at the Mineral–Water Interface

^a National Risk Management Research Lab., USEPA, 5995 Center Hill Avenue, Cincinnati, OH 45268
^b Dept. of Plant and Soil Sciences, Univ. of Delaware, Newark, DE 19717-1303

View larger version (28K): [in a new window]   Fig. 1. Macroscopic sorption of Ni sorbed ([Ni]o = 3.0 mM) on (a) pyrophyllite, (b) talc, (c) gibbsite, (d) silica, and (e) gibbsite/silica mixture at three different temperatures vs. time

View larger version (26K): [in a new window]   Fig. 3. Macroscopic sorption and apparent first-order kinetic plots of Ni sorbed ([Ni]o = 1.5 mM) on pyrophyllite (a and b) and talc (c and d) at three different temperatures

View larger version (28K): [in a new window]   Fig. 2. Apparent first-order kinetic plots of Ni sorption ([Ni]o = 3.0 mM) on (a) pyrophyllite, (b) talc, (c) gibbsite, (d) silica, and (e) gibbsite/silica mixture at three different temperatures

View larger version (24K): [in a new window]   Fig. 4. Parallel relationship of the first-order kinetic model with changing Co at three temperatures while all other reaction parameters remained constant (extract of Fig. 2a and 3b)

View larger version (14K): [in a new window]   Fig. 5. Comparison showing the near parallel relationship of Arrhenius and Eyring plots for data collected for Ni sorption ([Ni]o = 3.0 mM) on pyrophyllite at three temperatures

View larger version (17K): [in a new window]   Fig. 6. Compiled Arrhenius plots of Ni sorption on clay mineral and oxide surfaces at three different temperatures

View larger version (16K): [in a new window]   Fig. 7. Compiled Eyring plots of Ni sorption on clay mineral and oxide surfaces at three different temperatures

View larger version (25K): [in a new window]   Fig. 8. Effect of equivalent time at 25°C on Ni concentration in solution as affected by first-order kinetics for Ni sorption on (a) pyrophyllite, (b) talc, (c) gibbsite, (d) silica, and (e) gibbsite/silica mixture. Equivalent time was calculated from Eq. [7] and solid lines denote the fitted first-order kinetic model relationship (Eq. [8])

View larger version (11K): [in a new window]   Fig. 9. Relationship of energy of activation (Ea) and enthalpy of activation (H) by H = Ea – RT