List of Articles نانو کامپوزیت سیلیکاآﺋروژل

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  1 - Kinetics and Thermodynamics studies of Ni (II) adsorption by silica aerogel-activated carbon nanocomposite
  Zohreh Saadati Mahmood Shoogardzadeh
  10.22034/jest.2018.13740
  Abstract Background and Objective: Presence of toxic heavy metals like nickel in water resources is a major environmental problem in many communities.   Method: In this study, to stimulate the removal of Ni (II) from aqueous solution by silica aerogel-activated car More

  Abstract Background and Objective: Presence of toxic heavy metals like nickel in water resources is a major environmental problem in many communities.   Method: In this study, to stimulate the removal of Ni (II) from aqueous solution by silica aerogel-activated carbon nanocomposite, the parameters affecting the adsorption process such as pH, amount of adsorbent, contact time, temperature and concentration were investigated and optimized. Findings: The results showed the maximum adsorption at pH= 5. The lower pH, the more H+ ion competing with the metal ion for adsorption sites. Kinetic studies indicated that the adsorption process followed the pseudo-second order kinetics. Moreover, the equilibrium data related to adsorption isotherms showed a superiority of the Langmuir isotherm compared to other models. Discussion and Conclusion: Calculation of thermodynamic factors, such as ΔG◦, ΔH◦ and ΔS◦, indicated that the adsorption process is spontaneous, endothermic and irreversible. The results showed that silica aerogel-activated carbon nanocomposite has been successfully employed for the removal of Ni (II) from aqueous solutions.   Manuscript profile