Mg-Al layered double hydroxide intercalated with ethylene-diaminetetraacetate anion: Synthesis and application to the uptake of heavy metal ions from an aqueous solution
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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DOI：
10.1016/j.seppur.2005.06.001
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发表时间：
2005-12-01
影响因子：
8.6
通讯作者：
Umetsu, Y
中科院分区：
文献类型：
--
作者：
Kameda, T;Saito, S;Umetsu, Y
将Mg-Al层状双氢氧化物（Mg-Al LDH）与乙二胺四乙酸乙酯（edta）阴离子偶联，尝试开发一种具有从高浓度水溶液中选择性吸收重金属离子功能的清除剂。在NaOH和edta- 2na （edta二水二氢二钠）溶液中加入Mg(NO3)(2)和Al(NO3)(3)溶液，可以合成在Mg-Al LDH中间层中嵌入edta阴离子的Mg-Al LDH。溶液中NaOH浓度对edta生成的影响。研究了Mg-Al LDH对掺杂在中间层中的edta阴离子的化学种类的控制作用。合成的edta。Mg-Al LDH在恒定pH为5.0的水溶液中具有快速吸收Cu2+和Cd2+的能力。这种能力归因于edta中间层中edta-金属配合物的形成。Mg-Al LDH。本文报道，由于edta的作用，Cu2+浓度从64 mg/l下降到低于日本出水标准（3 mg/1）。M-Al LDH在10分钟的短时间内。Cd2+浓度在15 min内由112mg /l降至1mg /1以下。观察到edta优先从Cu-Cd混合氯化物溶液中吸收Cu2+。Mg-Al LDH在pH为5.0时。edta阴离子作为螯合剂的功能被认为在edta的中间层中具有充分的活性。Mg-Al LDH。(C) 2005 Elsevier B.V.版权所有
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.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(NO3)(2) and Al(NO3)(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 Cu2+ and Cd2+ 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.Mg-Al LDH. This paper reports that the concentration of Cu2+ decreased from 64 mg/l to less than the effluent standards in Japan (3 mg/1) due to the edta.M-Al LDH in a short span of 10 min. Furthermore, the concentration of Cd2+ decreased from 112 mg/l to less than I mg/1 within 15 min. The Cu2+ was observed to be preferentially uptaken from a Cu-Cd mixed chloride solution by the edta.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.Mg-Al LDH. (C) 2005 Elsevier B.V. All rights reserved.