不同粘土矿物材料对Pb2+的吸附特征

探讨了在不同矿物投加量、不同振荡时间、不同Pb2 浓度、不同矿物颗粒细度和不同pH条件下,钠基膨润土、膨胀蛭石和沸石3种粘土矿物对Pb2 的吸附效果.结果表明:对于具有可膨胀层间的粘土矿物而言,其对溶液中Pb2 的吸附量不仅仅由单一的阳离子交换量所决定;Pb2 在矿物表面的吸附过程是个迅速的过程,矿物对Pb2 的吸附在10 min内即可完成;粘土矿物不同颗粒细度对Pb2 的去除率有所不同,但考虑到实际应用中的成本问题,并非颗粒越细越好;就试验所采用的3种粘土矿物而言,其对Pb2 的吸附效果是,钠基膨润土和沸石明显优于膨胀蛭石;较高的pH有助于粘土矿物对溶液中Pb2 的吸附,但考虑到实际操作的其他因素,不能把pH调得过高.

The Absorption of Characteristics of Pb2+ with Different Clay Minerals

In this paper,the absorption effect of three clay minerals,Na-bentonite,expansibility vermiculite and zeolite,on Pb~(2 ) are studied in different conditions such as the amount of minerals,shaking time,the concentration of Pb~(2 ),the granularity of minerals and pH value.The results show that the quantity of absorption by expansibility clay mineral is not just decided by single CEC;the absorption of Pb~(2 ) on clay mineral surface is a rapid process,which is completed in ten minutes;the different granularity of clay minerals have different absorption effects on Pb~(2 ),but it is not the best way considering the cost in actual application.In this study the absorption effect of Na-bentonite and zeolite on Pb~(2 ) is obviously betterthan expansibility vermiculite;the higher pH value helps the absorption of Pb~(2 ),but the pH value can not be regulated too high considering other factors in actual operations.