Influence of structural Al species on Cd(II) capture by iron muscovite nanoparticles
Influence of structural Al species on Cd(II) capture by iron muscovite nanoparticles
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结构 Al 物种对铁白云母纳米颗粒捕获 Cd(II) 的影响
DOI：
10.1016/j.chemosphere.2019.04.015
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发表时间：
2019
期刊：
影响因子：
8.8
通讯作者：
Cui Hao-Jie
中科院分区：
文献类型：
--
作者：
Wu Cong;Wei Xiaoqing;Liu Pei;Tan Jie;Liao Chaolin;Wang Hongzheng;Yin Lichu;Zhou Weijun;Cui Hao-Jie
层状硅酸盐矿物结构中的类质同象取代对矿物表面化学性质起着重要的调控作用。在这项工作中，铁白云母纳米粒子与各种铝物种成功地制备，探索结构的Fe和Al物种对镉（II）的捕获溶液。合成的纳米晶体具有不规则的形状，直径为10-50 nm。Al（III）的掺入对铁的种类和产物的晶相有轻微的影响。随着Al掺杂量的增加，Al（III）取代Si（IV）的程度明显增加。对于低Al掺杂水平（5%和10%）的样品，铁白云母纳米颗粒对Cd（II）的吸附容量略有增加。随着Al掺杂比例增加到15%，所获得的铁白云母纳米颗粒表现出对Cd（II）的最大吸收为41.4 mg g− 1，约为未掺杂样品（22.8 mg g−1）的两倍。溶液的pH值有轻微的影响，镉（II）捕获在一个广泛的pH值范围从4至8。Cd（II）的吸附速度很快，在5 min内达到稳定吸附。脱附结果表明，高浓度Al的掺入明显增强了Cd（II）与铁白云母纳米粒子之间的结合强度。离子交换和表面络合是铁白云母纳米材料与各种结构的铝物种捕获镉（II）的主要机制。
The isomorphous substitution in the structure of phyllosilicate minerals plays an important role in regulating of surface chemical properties. In this work, iron muscovite nanoparticles with various Al species were successfully prepared to explore the structural Fe and Al species on the capture of Cd(II) from solutions. The synthesized nanocrystals have irregular shapes with diameters of 10–50 nm. The incorporation of Al(III) into the iron muscovite nanostructure has slight effect on the species of Fe and the crystal phase of the products. The degree of Al(III) substituting Si(IV) in the tetrahedral sheets of the minerals obviously increased with increasing of Al doping levels. For the samples with low Al doping levels (5% and 10%), the adsorption capacity of the iron muscovite nanoparticles for Cd(II) increased slightly. With increasing of Al doping ratio to 15%, the obtained iron muscovite nanoparticles exhibited a maximal uptake of 41.4 mg g−1for Cd(II), which is about two times that of the undoped samples (22.8 mg g−1). The solution pH had a slight effect on the Cd (II) capture at a wide pH range from 4 to 8. The adsorption of Cd(II) is very fast and reached a steady state within 5 min. Desorption results showed that the binding strength between Cd(II) and iron muscovite nanoparticles was obviously enhanced by incorporation of Al at a high level. The ion exchange and surface complexation are principal mechanisms in the Cd(II) capture by the iron muscovite nanomaterials with various structural Al species.