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The effect of Zn 2+ on both the kinetic and equilibrium aspects of arsenic adsorption to magnetite nanoparticles was investigated at pH 4.5–8.0. At pH 8.0, adsorption of both arsenate and arsenite to magnetite nanoparticles was significantly enhanced by the presence of small amount of Zn 2+ in the solution. With less than 3 mg/L of Zn 2+ added to the arsenic solution prior...
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