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The effect of competitive cations and anions on ion exchange of heavy metals

机译:竞争性阳离子和阴离子对重金属离子交换的影响

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In the present study,the effects of competitive cations NH_4~+,K~+,Ca~(2+),Na~+,Mg~(2+) and Li~+ and co-anions Cl~- and Br~- on ion exchange of heavy metals Pb~(2+),Fe~(3+),Cr~(3+) and Cu~(2+) on clinoptilolite is examined.The presence of cations and anions in the solutions of heavy metals is reducing the removal of the latter and the order of decreasing negative effect is the following:NH_4~+ > Mg~(2+) > Ca~(2+) > Na~+ > K~+ > Li~+ and Br~- > Cl~- for Pb~(2+),NH_4~+ > K~+ > Ca~(2+) > Na~+,Mg~(2+) approx = Li~+ and Br~- > Cl~- for Cr~(3+),NH_4~+ > K~+ > Na~+ > Ca~(2+) > Li~+ > Mg~(2+) and Cl~- > Br~- for Fe~(3+) and Ca~(2+) > NH_4~+ > Li~+ > K~+ > Na~+ > Mg~(2+) and Cl~- > Br~- for Cu~(2+).In all cases,the selectivity of clinoptilolite for heavy metals is the following:Pb~(2+)>Fe~(3+)>Cr~(3+)>=Cu~(2+).
机译:在本研究中,竞争性阳离子NH_4〜+,K〜+,Ca〜(2 +),Na〜+,Mg〜(2+)和Li〜+和共阴离子Cl〜-和Br〜-的影响斜发沸石上重金属Pb〜(2 +),Fe〜(3 +),Cr〜(3+)和Cu〜(2+)离子交换的研究。重金属溶液中阳离子和阴离子的存在减少了后者的去除,负效应的降低顺序如下:NH_4〜+> Mg〜(2+)> Ca〜(2+)> Na〜+> K〜+> Li〜+和Br〜 -> Cl〜-对于Pb〜(2 +),NH_4〜+> K〜+> Ca〜(2+)> Na〜+,Mg〜(2+)大约= Li〜+和Br〜-> Cl〜 -对于Cr〜(3 +),NH_4〜+> K〜+> Na〜+> Ca〜(2+)> Li〜+> Mg〜(2+)和Cl〜-> Br〜-对于Fe〜( 3+)和Ca〜(2+)> NH_4〜+> Li〜+> K〜+> Na〜+> Mg〜(2+)和Cl〜-> Br〜-对于Cu〜(2+)。在所有情况下,斜发沸石对重金属的选择性为:Pb〜(2 +)> Fe〜(3 +)> Cr〜(3 +)> = Cu〜(2+)。

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