纳米羟基磷灰石对苯酚的吸附

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.

Adsorption of Phenol from Aqueous Solution by Nano-hydroxylapatite

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 23.3mg·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 120min,and the adsorption kinetics can be depicted by pseudo-second-order reaction model.