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首页> 外文期刊>Separation and Purification Technology >Mg-Al layered double hydroxide intercalated with ethylene-diaminetetraacetate anion: Synthesis and application to the uptake of heavy metal ions from an aqueous solution
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Mg-Al layered double hydroxide intercalated with ethylene-diaminetetraacetate anion: Synthesis and application to the uptake of heavy metal ions from an aqueous solution

机译：Mg-Al层状双氢氧化物与乙二胺四乙酸根阴离子的嵌入：合成及其在从水溶液中吸收重金属离子中的应用

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摘要

The development of a scavenger,which has a function of selective uptake of heavy metal ions from an aqueous solution with a high concentration,has been attempted by coupling Mg-Al layered double hydroxide (Mg-Al LDH) with ethylenediaminetetraacetate (edta) anion. edta centre dot Mg-Al LDH that had an edta anion intercalated in the interlayer of Mg-Al LDH,could be synthesized by adding a solution of Mg(NO_3)_2 and Al(NO_3)_3 to a solution of NaOH and edta-2Na (disodium dihydrogen edta dihydrate).The effect of the NaOH concentration in the solution on the formation of edta-Mg-Al LDH was examined to control the chemical species of the edta anion incorporated in the interlayer.The synthesized edta-Mg-Al LDH was found to have a capacity for rapid uptake of Cu~(2+) and Cd~(2+) from an aqueous solution at the constant pH of 5.0.This capacity is attributed to the formation of the edta-metal complex in the interlayer of edta centre dot Mg-Al LDH.This paper reports that the concentration of Cu~(2+) decreased from 64 mg/1 to less than the effluent standards in Japan (3 mg/1) due to the edta centre dot Mg-Al LDH in a short span of 10 min.Furthermore,the concentration of Cd~(2+) decreased from 112 mg/1 to less than 1 mg/1 within 15 min.The Cu~(2+) was observed to be preferentially uptaken from a Cu-Cd mixed chloride solution by the edta centre dot Mg-Al LDH at the pH of 5.0.The function of edta anions as chelating agents is considered to be adequately active in the interlayer of edta centre dot Mg-Al LDH.
机译：已经尝试通过将Mg-Al层状双氢氧化物（Mg-Al LDH）与乙二胺四乙酸（edta）阴离子偶联来开发具有从高浓度水溶液中选择性吸收重金属离子的功能的清除剂。可以通过将Mg（NO_3）_2和Al（NO_3）_3的溶液添加到NaOH和edta-2Na的溶液中来合成具有edta阴离子插在Mg-Al LDH的中间层中的edta中心点Mg-Al LDH研究了溶液中NaOH浓度对edta-Mg-Al LDH形成的影响，以控制夹层中掺入的edta阴离子的化学种类。合成的edta-Mg-Al LDH发现在恒定的pH值为5.0时具有从水溶液中快速吸收Cu〜（2+）和Cd〜（2+）的能力，这归因于中间层中形成edta-金属络合物本文报道了由于EDTA中心点Mg-Al导致Cu〜（2+）的浓度从64 mg / 1降至日本的出水标准（3 mg / 1）以下。 Al LDH在短短10分钟内。此外，Cd〜（2+）的浓度在15分钟内从112 mg / 1降至小于1 mg / 1.Cu〜（2+）较黑最好是在pH为5.0时由EDTA中心点Mg-Al LDH从Cu-Cd混合氯化物溶液中优先摄取.EDTA阴离子作为螯合剂的功能被认为在EDTA中心点Mg的中间层中具有足够的活性。 -Al LDH。

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