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采用自制膨润土/木质素磺酸钠接枝丙烯酰胺-马来酸酐复合吸附树脂(Bentonite/LS-g-AM-co-MAH),研究了外加电解质中竞争阳离子与共存阴离子对Bentonite/LS-g-AM-co-MAH吸附Pb~(2+)的影响。结果表明:竞争阳离子Li~+、Na~+、K~+、Mg~(2+)、Ca~(2+)、Ni ~(2+)、Co~(2+)、Zn~(2+)、Cd~(2+)和Cu~(2+)抑制Pb~(2+)的吸附,抑制作用顺序为Cu~(2+)>Cd~(2+)>Zn~(2+)>Co~(2+)>Ni ~(2+)>Ca~(2+)>Mg~(2+)>K~+>Na~+>Li~+;Fe~(3+)和Al~(3+)在pH=2.0~3.0时抑制Pb~(2+)的吸附,在pH=4.0~6.0时促进Pb~(2+)的吸附,两者的影响顺序为Fe~(3+)>Al~(3+)。共存阴离子NO_3~-、Cl~-和Br~-抑制Pb~(2+)的吸附,抑制作用顺序为Br~->Cl~->NO_3~-;SO_4~(2-)和PO_4~(3-)有利于去除Pb~(2+),两者影响基本相同。
Bentonite / LS-g-AM-co-MAH was used to graft bentonite / sodium lignosulfonate into Bentonite / LS-g-AM- -AM-co-MAH adsorption on Pb 2+. The results show that the competitive cations Li +, Na +, K +, Mg 2+, Ca 2+, Ni 2+, Co 2+, Zn 2+ ), Cd 2+ and Cu 2+ inhibited the adsorption of Pb 2+, the order of inhibition was Cu 2+ + Cd 2+ + Zn 2+ + (2 +)> Ni 2+> Ca 2+> Mg 2+> K + Na + + Li + +; Fe 3+ and Al ~ 3+) inhibited Pb 2+ adsorption at pH = 2.0-3.0, and promoted the adsorption of Pb 2+ at pH = 4.0-6.0. The order of the effects was Fe 3+> Al ~ (3+). The coexisting anion NO_3 ~ -, Cl ~ - and Br ~ - inhibited the adsorption of Pb2 +, the order of inhibition was Br ~ -> Cl ~ -> NO_3 ~ SO_4 ~ (2-) and PO_4 ~ (3) -) is conducive to the removal of Pb ~ (2+), the impact of both are basically the same.