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Surface Modification of SiC Powder with Sodium Humate: Adsorption Kinetics, Equilibrium, and Mechanism
Youxing Liu1, Jiaxiang Liu1, Tianyu Yang2
1Beijing Key Laboratory of Electrochemical Process and Technology for Materials , Beijing University of Chemical Technology , Beijing 100029 , P. R. China.
Abstract:
Highly dispersible SiC powder was prepared using sodium humate as a modifier. The results showed that the ζ-potential absolute value of the modified SiC powder increased from 13.1 to 38.7 mV when the adsorption capacity of sodium humate on the SiC surface was 2.368 mg/g. The slurry with a maximum solid content of 65 vol % was obtained using the modified SiC powder, and the minimum viscosity value was 0.322 Pa s at a solid content of 50 vol %. The adsorption kinetics equation of sodium humate on the SiC surface is t/ q t = 0.6253 t + 11.0472, which is in accordance with the pseudo-second-order kinetics model. In addition, the isotherm equation, ln qe = 0.461 ln Ce - 0.334, agrees with the Freundlich model. The adsorption energy of sodium humate on the SiC surface was 0.8280 kJ/mol, indicating that the adsorption type was physical adsorption.
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