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Adsorption of Heavy Metal Ions from Aqueous Solutions by Bentonite Nanocomposites

机译:膨润土纳米复合材料对水溶液中重金属离子的吸附

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摘要

A series of bentonite nanocomposites have been synthesized by modifying bentonite with hexadecyltrimethylammonium bromide (CTMAB) and the common complexing agents, complexone (ethylene diamine tetraacetic acid, EDTA) or mercaptocomplexant (2-Mercaptobenzothiazole, MBT). These adsorbents are used to remove heavy metal ions (Cu~(2+), Zn~(2+), Mn~(2+), Co~(2+)). The Bent-CTMAB-MBT adsorbed metal ions are higher than Bent-CTMAB-EDTA under the same ion concentration in AAS. Compared with the single ion system, the adsorption of the mixed ion system of Cu~(2+), Zn~(2+), Mn~(2+), Co~(2+) had decreased differently. In the mixed system, the adsorption of Mn~(2+) is significantly lower, but the adsorption of Cu~(2+) was highest. The adsorption sequence of these four metal ions was Cu~(2+) > Zn~(2+) > Co~(2+) > Mn~(2+), and the selective adsorption was closely related to the hydration energy of heavy metal ions. We could remove more metal ions in different stages with the adsorption sequence.
机译:通过用十六烷基三甲基溴化铵(CTMAB)和常见的络合剂,络合物(乙二胺四乙酸,EDTA)或巯基络合剂(2-巯基苯并噻唑,MBT)改性膨润土,合成了一系列膨润土纳米复合材料。这些吸附剂用于去除重金属离子(Cu〜(2 +),Zn〜(2 +),Mn〜(2 +),Co〜(2+))。在AAS中相同的离子浓度下,Bent-CTMAB-MBT吸附的金属离子高于Bent-CTMAB-EDTA。与单离子体系相比,Cu〜(2 +),Zn〜(2 +),Mn〜(2 +),Co〜(2+)混合离子体系的吸附量有所不同。在混合体系中,Mn〜(2+)的吸附明显降低,而Cu〜(2+)的吸附最高。这四种金属离子的吸附顺序为Cu〜(2+)> Zn〜(2+)> Co〜(2+)> Mn〜(2+),选择性吸附与重金属的水合能密切相关。金属离子。我们可以按照吸附顺序在不同阶段去除更多的金属离子。

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