Journal of Surface Science and Technology

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Temperature and Electrolytic Effect on the Point of Zero Charge of Iron Hydroxide (AM)


Affiliations
1 National Centre of Excellence in Physical Chemistry, University of Peshawar, Peshawar, Pakistan
     

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The point of zero charge (PZC) of iron hydroxide has been determined between 30 and 60°C by measuring the distribution of the potential determining ions (H+, OH-) at the hydroxide-solution interfaces for six different electrolytes (LiCl, NaCl, KCl, LiNO3, NaNO3 and KNO3). For all these electrolytes a decrease in PZC has been observed. The cationic effect on the PZC of iron hydroxide (am) has been observed similar to lyotropic series i.e. Li+ > Na+ > K+. The investigated anionic effect for iron hydroxide is greater for nitrates than those of chlorides. Furthermore ΔH*, ΔS* and ΔG0* have been calculated by using Berube and DeBruyn equation.

Keywords

Point of Zero Charge, Iron Hydroxide-Solution Interface, Adsorption of Ions, Thermodynamics of Adsorption.
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  • Temperature and Electrolytic Effect on the Point of Zero Charge of Iron Hydroxide (AM)

Abstract Views: 263  |  PDF Views: 2

Authors

S. Mustafa
National Centre of Excellence in Physical Chemistry, University of Peshawar, Peshawar, Pakistan
Imtiaz Ahmad
National Centre of Excellence in Physical Chemistry, University of Peshawar, Peshawar, Pakistan
Dilara Begum
National Centre of Excellence in Physical Chemistry, University of Peshawar, Peshawar, Pakistan

Abstract


The point of zero charge (PZC) of iron hydroxide has been determined between 30 and 60°C by measuring the distribution of the potential determining ions (H+, OH-) at the hydroxide-solution interfaces for six different electrolytes (LiCl, NaCl, KCl, LiNO3, NaNO3 and KNO3). For all these electrolytes a decrease in PZC has been observed. The cationic effect on the PZC of iron hydroxide (am) has been observed similar to lyotropic series i.e. Li+ > Na+ > K+. The investigated anionic effect for iron hydroxide is greater for nitrates than those of chlorides. Furthermore ΔH*, ΔS* and ΔG0* have been calculated by using Berube and DeBruyn equation.

Keywords


Point of Zero Charge, Iron Hydroxide-Solution Interface, Adsorption of Ions, Thermodynamics of Adsorption.