I found that, there is a difference in pHPZC value when higher impregnation ratio of acid on adsorbent surface. Lower pHPZC value when higher ratio of acid impregnation and adsorption performance is also better for heavy metals removal (+ charge).
Dear Dr Nur--please take a look at the following useful links:
https://www.researchgate.net/post/What_is_use_of_point_of_zero_charge_of_any_adsorbent_How_can_we_use_that_value_to_support_the_results_of_experiment
Article Estimation of the Point of Zero Charge of Simple Oxides by M...
Regards--
Not at all. The surface charge can be related to 'zeta-potential', not 'zero point charge'. If the zeta-potential is negative, surface charge is positive and vice versa.
For measuring Zeta-potential, you have to use a particle-size analyzer, while zero-point charge can be obtained through a simple pH metric titration.
I would like to suggest you, please have a clear idea about the difference of the two.
https://www.researchgate.net/post/What_are_the_differences_between_zeta_potential_and_point_of_zero_charge
This question-answer forum is very good to understand what these are actually, although the specific answer about the 'difference' is not elucidated well. If you want more distinct idea, please download the attached paper with this answer.
If you want to learn more, please read: Carbon 40, (2002), 95-102
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