4.7 Article

Effective removal of Co(II) and Sr(II) from radiocative wastes using covalent triazine frameworks: Kinetics and isotherm studies

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ELSEVIER
DOI: 10.1016/j.seppur.2021.119633

关键词

Adsorption; Langmuir isotherm; Co(II); Sr(II); CTF

资金

  1. National Natural Science Foundation of China [22076168, 21876156, 22006078, 41907100]
  2. China Postdoctoral Science Foundation [2020M681809]
  3. Zhejiang Provincial Ten Thousand Talent Program [2018R52013]
  4. Zhejiang Province Postdoctoral Foundation [ZJ2020083]
  5. Zhejiang Provincial Natural Science Foundation of China [LR21E080001]
  6. K. C. Wong Magna Fund in Ningbo University

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The study investigated the dynamic adsorption of radionuclides Co(II) and Sr(II) onto covalent triazine frameworks (CTFs) and found that the Langmuir isotherm and pseudo-second-order models performed better in describing the experimental data. The adsorption equilibrium time and maximum monolayer adsorption capacity varied for Co(II) and Sr(II) on different CTFs. Thermodynamic analyses revealed that the adsorption process of Co(II) and Sr(II) onto CTF was spontaneous and endothermic, favored at higher temperature.
Adsorption of pollutants onto adsorbents is extremely important for water purification systems. In this study, the dynamic adsorption of radionuclides Co(II) and Sr(II) onto covalent triazine frameworks (CTFs) was explored. The effects of the adsorption conditions such as the amount of CTF (10, 25, and 50 mg), radionuclides concentrations (0.50-500.0 mg L-1), and adsorption temperature (293, 303, and 313 K) on the adsorption capacity was examined. Adsorption kinetics data were analyzed by using the pseudo-first-order and pseudo-second-order kinetic models. Langmuir and Freundlich models were used for analyzing adsorption isotherms. The results showed that the Langmuir isotherm and pseudo-second-order models described the experimental data better than the other models. The adsorption equilibrium time of CTF-N and CTF-B are 600 s and 200 s. The maximum monolayer adsorption capacity (qmax) of CTF-B and CTF-N for Co(II) were determined as 50.76 mg g-1 and 60.82 mg g-1 at 303 K. The qmax of CTF-B and CTF-N for Sr(II) were 43.12 mg g-1 and 55.89 mg g-1 at 303 K. Thermodynamic analyses indicated that the adsorption process of Co(II) and Sr(II) onto CTF was spontaneous (Delta G 0) and endothermic (Delta H 0) and was favored at higher temperature.

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