Adsorption of Cu~(2+) on Nano-hydroxyapatite

Nano-hydroxyapatite synthesized by sol-gel technique was used to adsorb Cu2+ from aqueous solution.The effects of reaction time,pH and initial concentration of Cu2+ on the adsorption were investigated,and the adsorption mechanism was discussed.The results show that the adsorption quantity increases linearly from pH 4.5 to 7.5;the adsorption equilibrium can be achieved in 60min,when pH is higher than 7.5,Cu2+ is almost completely removed,and the maximum adsorption capacity is 51.28mg/g.n-HAP is an effective adsorbent for Cu2+,and the adsorption is a process of Langmuir adsorption isotherms,following the pseudo-second-order kinetic equation.