In this paper,the surface sites of quartz and their protonation were first analyzed and discussed,and then the surface reaction of heavy metal ions,involving Cu2+,Pb2+,Cd2+ and Ni2+,with quartz were completely investigated.The pHPPZC (pristine point of zero charge) for quartz was about 2.8 and the surface protonation constants in log form,lgKint1 and lgKint2,were about -1.5,7.0,respectively.The adsorption mass of Cu2+ decreased with the ionic strength changing from 0.1 to 1.0mol/L;while the adsorption mass of heavy metal ions,including Cu2+,Pb2+,Cd2+ and Ni2+,decreased with raise in temperature.The experimental results showed that the surface reaction of heavy metal ions with quartz was surface complexation adsorption in model and the supporting electrolyte ions had taken part in competing adsorption under the experimental conditions.
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