以MCM-22分子筛为载体,利用浸渍、超声分散和液相还原等方法将纳米铁离子均匀地负载到其表面,制备出负载型Fe0/MCM-22复合材料.通过XRD、SEM和EDS等手段对复合材料进行了表征分析,并探讨不同反应条件对Fe0/MCM-22去除水体中Pb(Ⅱ)的影响.结果表明,Fe0/MCM-22保持了MCM-22分子筛的薄片状结构,这些薄片有规则的聚集在一起,而且紧凑有序.另外,纳米铁颗粒均匀地分散负载在薄片上,颗粒呈球形或椭球形,粒径约为50～80nm,其团聚明显减少.在常温下,初始Pb(Ⅱ)的浓度为140mg/L,pH值为5,Fe0/MCM-22的投加量为0.5g/L,反应时间为120min时,Pb(Ⅱ)的去除率可达92.52％.对其反应动力学研究表明,反应过程符合一级反应动力学.
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