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ZnO surface is positively charged below pH 9 and above this pH, surface is negatively charged by adsorbed OH− ions.
As particle surfaces are positively charged below the pHPZC, cation adsorption in this pH region likely involves specific interactions.
This partially neutral and partially negatively charged arsenite ion is attracted to the positively charged (below 8.2) surface of the resin (Budinova et al. 2006).
ZnO surface is positively charged below pH 9, whereas it is negatively charged above pH 9 based on their pzc (Bansal and Sud 2011).
Maghemite, with a pHPZC of 6.3 6.9 (Vayssieres 2009) is positively charged below pH 6.3 6.9 but becomes increasingly negatively charged as pH increases.
By lowering the pH from 7 to 4, the increase in BSA adsorption was remarkable, whereas the decrease was very slight when pH was increased from 7 to 10. Knowing that BSA has an IEP of 4.7 [35], BSA molecules bore, therefore, negative charges at pH above 7 and were positively charged below its IEP.
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