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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:二氧化硅气体支持的羟基齐齐齐齐齐齐齐齐齐齐齐,用于通过沉淀转化反应高效除去Pb(II)离子

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摘要

Abstract 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.
机译:摘要在这项工作中,通过简单且经济的方法制备二氧化硅气凝胶上负载的羟基胞菌和Zn / Al-Co3 2-水滑石,并用作Pb(ii)的吸附剂。支持的羟基胞质和Zn / Al-Co3 2-水滑石具有超薄厚度,高表面积和弱结晶度。在分批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)吸附能力,并且吸附数据与Langmuir等温模型和伪二阶动力学模型很好,表明a表面化学机制。基于Langmuir等温模型计算的吸附容量分别为384.9mg / g和555.6mg / g,分别高于其他水滑石的吸附剂和大多数无机的吸附能力高于吸附容量和其他无机的吸附能力之前报道的吸附剂。在吸附后,羟基胞菌和Zn / Al-Co3 2-水滑石的XRD衍射峰消失,并且Pb(II)物种以Pb3(CO 3)2(OH)2的形式均匀地分散在吸附剂中,通过TEM,EDS被证明映射和XRD分析,证明吸附性质是羟基胞菌或Zn / Al-Co3 2-水滑石的沉淀转化为PB3(CO 3)2(OH)2。这些结果证明了CO 3的协同PB(II)和OH------衍生自羟基胞质和Zn / Al-Co3 2-水滑石,其超薄厚度和高表面积有助于吸附剂的优异性能。

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