TY - JOUR
T1 - Comparison of different methods for the point of zero charge determination of NiO
AU - Mahmood, Tahira
AU - Saddique, Muhammad Tahir
AU - Naeem, Abdul
AU - Westerhoff, Paul
AU - Mustafa, Syed
AU - Alum, Absar
PY - 2011/9/7
Y1 - 2011/9/7
N2 - Four methods, fast titration, salt addition, mass titration, and Χ potentiometry, were employed to determine the point of zero charge (PZC) and isoelectric point (IEP) of NiO. However, this work mainly focuses on the fast titration method because it limits the release of Ni from the substrate. Furthermore, the fast titration is simple, rapid, and accurate and requires a small quantity of substrate as compared to the salt addition and mass titration techniques. The similarity between the PZC and IEP values rules out the specific adsorption of the bulk electrolyte onto the NiO surface. However, the PZC values shift downward with the increase in Cd ion concentration, which indicates the specific adsorption of Cd onto the NiO. In addition, temperature has a mild effect on the deprotonation constants and PZC of NiO. It was also observed that the thermodynamic parameters favor the deprotonation of NiO.
AB - Four methods, fast titration, salt addition, mass titration, and Χ potentiometry, were employed to determine the point of zero charge (PZC) and isoelectric point (IEP) of NiO. However, this work mainly focuses on the fast titration method because it limits the release of Ni from the substrate. Furthermore, the fast titration is simple, rapid, and accurate and requires a small quantity of substrate as compared to the salt addition and mass titration techniques. The similarity between the PZC and IEP values rules out the specific adsorption of the bulk electrolyte onto the NiO surface. However, the PZC values shift downward with the increase in Cd ion concentration, which indicates the specific adsorption of Cd onto the NiO. In addition, temperature has a mild effect on the deprotonation constants and PZC of NiO. It was also observed that the thermodynamic parameters favor the deprotonation of NiO.
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U2 - 10.1021/ie200271d
DO - 10.1021/ie200271d
M3 - Article
AN - SCOPUS:80052379636
SN - 0888-5885
VL - 50
SP - 10017
EP - 10023
JO - Industrial and Engineering Chemistry Research
JF - Industrial and Engineering Chemistry Research
IS - 17
ER -