It is known that silicotitanate and AMP-PAN are stable to radiation, highly selective for cesium relative to sodium, potassium, rubidium, and protons, and performs well in acidic, neutral, and basic solutions. Adsorption isotherms for Sr^(2+), Co^(2+) and Cs^(+) on silicotitanate and AMP-PAN were ex...
It is known that silicotitanate and AMP-PAN are stable to radiation, highly selective for cesium relative to sodium, potassium, rubidium, and protons, and performs well in acidic, neutral, and basic solutions. Adsorption isotherms for Sr^(2+), Co^(2+) and Cs^(+) on silicotitanate and AMP-PAN were examined at 25℃ over a wide range of metal ion concentrations. The uptake of Sr^(2+) and Co^(2+) found to increase with the increase pH of the adsorptive solutions and that of Cs^(+) was not related to pH. The adsorption data obtained fitted both Langmuir and Freundlich isotherms. The goodness of fit was evaluated by the determination coefficient R². On silicotitanate, the Langmuir model was fitted successfully to Cs^(+), while the Freundlich model was fitted better for Sr^(2+) and Co^(2+). On AMP-PAN, a Langmuir model was fitted successfully to Cs^(+), while the Freundlich model was fitted better for Sr^(2+) and Co^(2+) In bi-solute competitive system, sorption of the each three solutes was reduced due to competition as compared with each single solute system. Co-exist with ion which have a bigger affinity on sorbent, the sorption rates were more decreased. The ideal adsorbed solution theory (IAST) coupled with Freundlich model and Langmuir model of single solute and Langmuir competitive model (LCM) were employed to predict the bi-solute competitive sorption. On AMP-PAN, LCM predicted more precisely while IAST model had the better R² on Silicotitanate. When the non-radionuclides like a Na^(+), Ca^(2+) or surfactant exist with solutes, silicotitanate and AMP-PAN showed distribution coefficients. In other words, these materials had excellent ability to remove radionuclides.
It is known that silicotitanate and AMP-PAN are stable to radiation, highly selective for cesium relative to sodium, potassium, rubidium, and protons, and performs well in acidic, neutral, and basic solutions. Adsorption isotherms for Sr^(2+), Co^(2+) and Cs^(+) on silicotitanate and AMP-PAN were examined at 25℃ over a wide range of metal ion concentrations. The uptake of Sr^(2+) and Co^(2+) found to increase with the increase pH of the adsorptive solutions and that of Cs^(+) was not related to pH. The adsorption data obtained fitted both Langmuir and Freundlich isotherms. The goodness of fit was evaluated by the determination coefficient R². On silicotitanate, the Langmuir model was fitted successfully to Cs^(+), while the Freundlich model was fitted better for Sr^(2+) and Co^(2+). On AMP-PAN, a Langmuir model was fitted successfully to Cs^(+), while the Freundlich model was fitted better for Sr^(2+) and Co^(2+) In bi-solute competitive system, sorption of the each three solutes was reduced due to competition as compared with each single solute system. Co-exist with ion which have a bigger affinity on sorbent, the sorption rates were more decreased. The ideal adsorbed solution theory (IAST) coupled with Freundlich model and Langmuir model of single solute and Langmuir competitive model (LCM) were employed to predict the bi-solute competitive sorption. On AMP-PAN, LCM predicted more precisely while IAST model had the better R² on Silicotitanate. When the non-radionuclides like a Na^(+), Ca^(2+) or surfactant exist with solutes, silicotitanate and AMP-PAN showed distribution coefficients. In other words, these materials had excellent ability to remove radionuclides.
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