Abstract: According to kinetic calculation of adsorption K⁺ using coconut activated carbon in molten aluminum electrolyte， the modification of the surface properties and the capacity of removing potassium (K⁺) using the high-temperature modified cocoanut activated carbon were studied， associated with the analysis of SEM， ASAP2000M and FTIR spectrometer. The results showed that the specific surface area changed from 918m²/g to 2544 m²/g after high-temperature modification and the pore size distribution of the adsorbent which exhibited the uniform mesopores were optimized. Meanwhile， the functional group species of activated carbon were not changed after high-temperature modification， which indicated that the structure of high-temperature modification activated carbon could keep stable in molten aluminum electrolyte. For the capacity of removing K⁺， it was found that the adsorption kinetics process could be described using the pseudo-second-order model and the adsorption equilibrium was reached after 35 minutes with the maximum adsorption capacity of K⁺ of 20.8mg/g.

Key words: high temperature modification, coconut activated carbon, aluminum electrolyte, potassium； adsorption