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本文对中和共沉淀法Fe_3O_4生成过程中重金属离子并合程度及其影响因素进行了研究,在实验条件下,发现重金属离子在Fe_3O_4晶格中的并合与其离子半径、电负性和外层电子分布等因素有关。并合程度为:Cu~(2+),CO~(2+),Fe~(2+)>Mn~(2+),Zn~(2+)>Ni~(2+),Cd~(2+),当Fe~(2+)/Fe~(3+)=0.5,pH=9.5±0.5时,对40mgCu~(2+),总铁量(Fe~(2+)+Fe~(3+))2.5g为最小投料量,其并合率可达99.7％以上,相同条件下CO~(2+)并合率大于99.7％,其它重金属离子由于本征特性影响,并合率各不相同,工艺条件适合于污水中Cu~(2+)和Co~(2+)的有效去除,对Mn~(2+),Zn~(2+)的去除也有一定效果,从沉渣的XRD物相分析可知,重金属离子在Fe_3O_4中的并合,是以尖晶石型结构取代式固溶体组成完成的。
In this paper, the degree of coexistence of heavy metal ions and their influencing factors during the Fe_3O_4 formation by the coprecipitation method were studied. Under the experimental conditions, it was found that the combination of heavy metal ions in the Fe_3O_4 lattice with its ionic radius, electronegativity and outer layer Electronic distribution and other factors. (2 +), CO ~ (2 +), Fe ~ (2 +)> Mn ~ (2 +), Zn ~ (2 +)> Ni ~ (2+), Cd ~ (Fe 2+ + Fe 2+ + Fe 2+ + Fe 2+ + Fe 2+ + Fe 2+ + Fe 2+ + Fe 2+ + Fe 2+ + Fe 2+ + Fe 2+ + 3 +)) 2.5g is the minimum amount of feed, the combined rate of up to 99.7%, the CO 2 under the same conditions the combined rate of more than 99.7%, other heavy metal ions due to the intrinsic characteristics of the impact, the combined rate of The process conditions are suitable for the effective removal of Cu2 + and Co2 + from wastewater, and also have certain effects on the removal of Mn2 + and Zn2 + from the sediment by XRD Phase analysis shows that the combination of heavy metal ions in Fe_3O_4 is based on the substitution of spinel-type solid solution.