The eutrophication of water bodies is mainly in relation to nitrate and phosphate. However ,most treatment methods at present can have removing effects only on one kind of the pollutants. The home-made bimetal Fe/Na supported composite materials (DOW 3N-Fe/Ni) can realize the simultaneous removal of nitrate/phosphate. When NO3--N is 20 mg/L,and PO43--P 1 mg/L,the removing rates of NO3-and PO43-can research 70%and 99%,respectively. The mechanisms of simultaneous removal of nitrate/phosphate by using DOW 3N-Fe/Ni are discussed. It is known that Fe/Ni metals in the reduction process of NO3-are oxidized as metallic ions or metallic oxidants and hydroxide. Based on Lewis acid-base theory,electrostatic effect,and adsorption effect on the removal of PO43-,the simultaneous removal of NO3-and PO43-is achieved.%水体的富营养化主要与硝酸盐和磷酸盐有关,但目前的处理方法大多只对其中一种污染物有去除效果.制备的负载型Fe/Ni双金属复合材料(DOW 3N-Fe/Ni)能实现NO3-和PO43-的同步去除.当NO3--N为20 mg/L,PO43--P为1 mg/L时,NO3-和PO43-的去除率分别可达70%和99%.探讨了DOW 3N-Fe/Ni同步去除NO3-和PO43-的机理,铁镍金属在还原NO3-的过程中被氧化为金属离子或金属氧化物及氢氧化物,并通过Lewis酸碱理论、静电作用及吸附作用去除PO43-,实现NO3-和PO43-的同步去除.
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