首页> 美国卫生研究院文献>Nanoscale Research Letters >Silica Aerogel-supported Hydrozincite and Carbonate-intercalated Hydrotalcite for High-efficiency Removal of Pb(II) Ions by Precipitation Transformation Reactions
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Silica Aerogel-supported Hydrozincite and Carbonate-intercalated Hydrotalcite for High-efficiency Removal of Pb(II) Ions by Precipitation Transformation Reactions

机译:二氧化硅气凝胶负载的水锌矿和碳酸盐插层的水滑石通过沉淀转化反应高效去除Pb(II)离子

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摘要

In this work, hydrozincite and Zn/Al-CO3 2− hydrotalcite supported on silica aerogel were prepared via a simple and economical process and used as adsorbents for Pb(II) removal. The supported hydrozincite and Zn/Al-CO3 2− hydrotalcite possess ultra-thin thickness, high surface area, and weak crystallinity. In the batch Pb(II) adsorption experiments, the adsorbents with higher Zn(II) contents showed higher Pb(II) adsorption capacities, and the adsorption data fitted well with the Langmuir isotherm model and pseudo-second-order kinetic model, indicating a mechanism of surface chemisorption. The adsorption capacities calculated based Langmuir isotherm model are 684.9 mg/g and 555.6 mg/g for the supported hydrozincite and Zn/Al-CO3 2− hydrotalcite, respectively, higher than the adsorption capacities of other hydrotalcite-based adsorbents and most of other inorganic adsorbents reported previously. The XRD diffraction peaks of hydrozincite and Zn/Al-CO3 2− hydrotalcite disappeared after the adsorption, and the Pb(II) species were uniformly dispersed in the adsorbents in form of Pb3(CO3)2(OH)2 proven by TEM, EDS mapping and XRD analysis, demonstrating the nature of the adsorption is the precipitation conversion of hydrozincite or Zn/Al-CO3 2− hydrotalcite into Pb3(CO3)2(OH)2. These results demonstrate the synergic Pb(II) removal effect of the CO3 2− and OH derived from hydrozincite and Zn/Al-CO3 2− hydrotalcite together with their ultra-thin thickness and high surface area contribute the excellent properties of the adsorbents.Electronic supplementary materialThe online version of this article (10.1186/s11671-017-2323-2) contains supplementary material, which is available to authorized users.
机译:在这项工作中,通过简单,经济的方法制备了负载在二氧化硅气凝胶上的水锌矿和Zn / Al-CO3 2-水滑石,并将其用作去除Pb(II)的吸附剂。负载水锌矿和Zn / Al-CO3 2-水滑石具有超薄的厚度,高的表面积和弱的结晶度。在分批的Pb(II)吸附实验中,具有较高Zn(II)含量的吸附剂显示出较高的Pb(II)吸附容量,并且吸附数据与Langmuir等温模型和拟二级动力学模型吻合得很好。表面化学吸附的机理。根据Langmuir等温线模型计算得出的负载水合锌矿和Zn / Al-CO3 2-水滑石的吸附容量分别为684.9 mg / g和555.6 mg / g,高于其他水滑石的吸附容量。基吸附剂和以前报道的大多数其他无机吸附剂。吸附后水锌矿和Zn / Al-CO3 2-水滑石的XRD衍射峰消失,Pb(II)物种以Pb3(CO3)2(OH)的形式均匀地分散在吸附剂中。 )2经TEM,EDS映射和XRD分析证明,表明吸附的性质是水锌矿或Zn / Al-CO3 2-水滑石的沉淀转化为Pb3(CO3)2(OH)2 。这些结果证明了水合锌矿和Zn / Al-CO3 2- 2-和OH -的协同Pb(II)去除作用>水滑石及其超薄的厚度和高的表面积,使吸附剂具有出色的性能。电子补充材料本文的在线版本(10.1186 / s11671-017-2323-2)包含补充材料,授权用户可以使用。

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