In this paper,static adsorption method was used to study adsorption characteristics and the adsorption kinetics mechanisms of strontium ions on P-Al-MMT and Ca-MMT.The effects of adsorption time,strontium ion concentration,pH and temperature on the adsorption of P-Al-MMT and Ca-MMT were explored.P-Al-MMT and Ca-MMT were characterized,and the adsorption process were fitted with isothermal adsorption equation and kinetic equation.Th results showed that the surfaces of P-Al-MMT and Ca-MMT were relatively uniform,indicating that the isothermal equilibrium adsorption belonged to monolayer adsorption.The isothermal adsorption equation of P-Al-MMT and Ca-MMT for strontium ions was in line with Langmuir model.The adsorption kinetics curves of strontium ions on P-Al-MMT and Ca-MMT were fitted by Elovich model,double constant rate model,parabolic diffusion model and first-order reaction kinetic model.The adsorption processes of P-Al-MMT and Ca-MMT for strontium ions were non-homogeneous diffusion process,and both were in accordance with Elovich model.The adsorption process of Sr2+ by P-Al-MMT and Ca-MMT increased with the increase of pH and temperature.
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基金资助
国家自然科学基金(21167010)
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