Surface charge properties of Fe2O3 in aqueous and alcoholic mixed solvents

Effect of Water Hardness and pH on Adsorption Kinetic of Arsenate on Iron Oxide

“…At pH > 8, equilibrium arsenic concentration in water increased to 512.82 and 905.52 µg/L at pH 10 and 12. Two studies, Mustafa et al, and Parks and Bruyn [32,33] which measured the surface charge of iron oxide as a function of pH may explain the results of our study. At pH 8, iron oxide has a negative surface charge [32,33].…”

“…Two studies, Mustafa et al, and Parks and Bruyn [32,33] which measured the surface charge of iron oxide as a function of pH may explain the results of our study. At pH 8, iron oxide has a negative surface charge [32,33]. At pH > 8, arsenic exists as HAsO4 2- [34], which adsorbs on positive iron oxide [32,33].…”

“…Iron oxide particles have an irregular shape and rough surface. The optimal pH for adsorption is around 8.0, which indicated that electrostatic repulsion between arsenic and iron oxide particles was lowest at this point [32,33]. adsorb arsenic to reach equilibrium.…”

“…At pH 8, iron oxide has a negative surface charge [32,33]. At pH > 8, arsenic exists as HAsO4 2- [34], which adsorbs on positive iron oxide [32,33]. These two effects leads to electrostatic repulsion between the negatively charged iron oxide and arsenic oxide particles [35].…”

Adsorption of phosphate from water on lake sediments amended with zirconium-modified zeolites in batch mode

“…The effect of pH on phosphate adsorption onto the raw and ZrMZamended sediments could be attributed to the acid-base properties of hydroxyl groups on the metal oxides, which resulted in the protonation or deprotonation of its surface. The pH PZC of iron oxides was reported to be between 5.7 and 6.2 (Mustafa et al, 2004). The pH PZC of aluminum oxides was reported to be above 8.0 (Lǔ et al, 2013).…”