The carbonated hydroxyapatite/potash feldspar composite materials(CK) were prepared by liquid method using potash feldspar as raw materials.Taking the adsorption rate of 200mg·L-1 Ni2+as response value,the preparation conditions were optimized by single factor test and response surface analysis.The results indicated that the optimal preparation conditions for CK were as follow:the molar ratio of CO2-3 to PO3-4 0.23,the mass ratio of potash feldspar to hydroxyapatite 0.4,the stirring temperature 43.1℃,the stirring time 2h,and the aging time 24h.At this condition,the adsorption rate of CK to Ni2+ can reach 92.9%.CK were characterized and analyzed by SEM,XRD,FT-IR,and BET.The result showed that the surface of potash feldspar became loosen and rough apparently after loaded on carbonated hydroxyapatite.The total pore volume and specific surface area of CK increased by nearly 55 and 60times than the raw material,respectively.Therefore,the CK obtained were expectable and can to be a novel environmental mineral adsorbent for removing heavy metal pollution.
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基金资助
国家自然科学基金资助项目(21467029)
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