纳米羟基磷灰石对苯酚的吸附

摘要

溶胶-凝胶法合成纳米羟基磷灰石(n - HAP)后再吸附水溶液中的苯酚,研究pH值及苯酚的初始浓度和平衡时间对吸附行为的影响,探讨其反应机理.结果表明:在碱性范围内对苯酚的吸附效果好,随着pH值的增加,吸附量逐渐增加,在pH≈11时吸附量能达到23.3mg.g-1;n - HAP对苯酚的吸附属Langmuir等温吸附模型；在120 min时吸附达到平衡,吸附速率符合拟二级动力学方程.%Nano-hydroxylapatite (n-HAP) was used to adsorb phenol from aqueous solution which was synthesized by sol-gel method, and the effect of pH,the initial concentration of phenol and equilibrium time were investigated,and the adsorption mechanism was discussed. The results show that phenol is more favorably adsorbed on n - HAP in the basic range, the adsorption capacity increases with the increase in pH,and reaches 23.3 mg · g -1 at pH = 11. The isotherm study shows that the Langmuir isotherm is the best choice to describe adsorption;the adsorption equilibrium can be achieved in 120 min,and the adsorption kinetics can be depicted by pseudo-second-order reaction model.