Point of Zero Charge and Isoelectric Point of Alumina

Removal of Pb2+ ions by raw corn silk (Zea mays L.) as a novel biosorbent

“…At pH value higher than pH PZC adsorbent surface charge is negative and could interact with cations, at pH value lower than pH PZC adsorbent surface charge is positive and could interact with anions [17,18]. The knowledge about of pH PZC may indicate the possible electrostatic interactions among adsorbent and metal ions in solution [18].…”

A model to predict maximum tolerable temperatures of metal-oxide-supported 1- n -butyl-3-methylimidazolium based ionic liquids

“…PZC is a good measure of surface acidity, thus, we performed simple acid-base titration (Gulicovski et al, 2008) to quantify the surface acidity of individual metal-oxides. According to these measurements and consistent with literature data (Kosmulski, 2014), the PZC values of metal-oxides increase from a pH of 1.7 for SiO 2 to 4.5 for TiO 2 , to 7.6 for γ-Al 2 O 3 , and to 9.8 for MgO.…”

“…4 mg of each metal-oxide was dispersed in 20 g of 0.1 M KNO 3 solution and ultrasonicated for approximately 5 min to improve dispersion. Dispersed samples were titrated with 0.25 M NaOH and HNO 3 as described in the literature (Gulicovski et al, 2008). Instrument pH increment was set to 0.2 for the measurements of SiO 2 , TiO 2 , and γ-Al 2 O 3 , and that for backwards measurements was …”

Pb(II) biosorption by selected waste biomass

“…pH value at which adsorbent surface charge has a zero value is point of zero charge (pH PZC ). At pH value greater than pH PZC adsorbent surface charge is negative and might interact with cations, accordingly at pH value lower than pH PZC adsorbent surface charge is positive and could interact with anions [17,18]. The information about of pHPZC could indicate the possible electrostatic interactions between adsorbent and metal ions in solution [18].…”