pH及离子强度对石英砂负载羟基磷灰石吸附锰的影响

摘要

制备石英砂负载羟基磷灰石复合材料去除铀尾矿库重金属锰,以PHREEQC计算不同pH锰的赋存形态,并用五种经典动力学模型对吸附过程进行拟合、分析其吸附机理;阐述不同离子强度、阴阳离子对锰的去除效果.试验表明,不同pH对锰的吸附效果具有较大差异,CO32、PO43可促进去除,Cd2-、Mg2+则与Mn2+竞争吸附位点,降低复合材料吸附量.%Hydroxyapatite coated quartz sands composite was prepared to remove heavy metal manganese in uranium tailing.PHREEQC was applied to calculate species of manganese in solution at different pH value.Adsorption mechanism was analyzed by five classical dynamic models.Removal efficiency of manganese by different ionic strength as well as anions and cations were expounded.The results show that there is a great difference in adsorption of manganese with different pH value conditions in that CO32+ and PO43+ can promote removal,while Cd2+,Mg2+ and Mn2+ compete on adsorption sites and reduce amount of adsorption.