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The surface charge properties of two SiO2 and three Al2O3 mineral adsorbents with varying degrees of framework porosity were investigated using discontinuous titration and ion adsorption methodologies. Points of zero net charge (p.z.n.c) for porous and non-porous SiO2 were <2.82 and for Al2O3 minerals ranged from 6.47–6.87. Silica surfaces possessed very slight negative charge in the acid pH range...
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