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首页> 外文期刊>RSC Advances >Preparation and characterization of chitosan/silver nanoparticle/copper nanoparticle/carbon nanotube multifunctional nano-composite for water treatment: heavy metals removal; kinetics, isotherms and competitive studies
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Preparation and characterization of chitosan/silver nanoparticle/copper nanoparticle/carbon nanotube multifunctional nano-composite for water treatment: heavy metals removal; kinetics, isotherms and competitive studies

机译：用于水处理的壳聚糖/银纳米颗粒/铜纳米颗粒/碳纳米管多功能纳米复合材料的制备与表征。动力学，等温线和竞争性研究

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摘要

In this work, a multifunctional nanocomposite of chitosan, silver nanoparticles (Ag NPs), copper nanoparticles (Cu NPs) and carbon nanotubes (CNTs) has been successfully prepared. The structure has been confirmed using X-ray diffraction, scanning and transmittance electron microscopes. CNTs, Ag NPs and Cu NPs are distributed homogeneously inside the polymer matrix. The adsorption efficiency of chitosan for Cu(II), Cd(II) and Pb(II) reached 60% using 5 g L-1 adsorbent dose while for the multifunctional composite, it reached 100% adsorption efficiency with a reduction of the amount of adsorbent to 1 g L-1. For the multifunctional composite, 10 min is enough for almost complete removal of metal ions from the solution while for chitosan the efficiency is rather lower. The adsorption process fitted to the pseudo-second order kinetic model and Langmuir isotherm in the linear form in case of chitosan while in case of the multifunctional composite, it fitted to the pseudo-second order kinetic model and Langmuir and Freundlich models in the non-linear forms. The maximum amount adsorbed (Q(max)) was found to be directly related to and fitted well with the electrode potential values of metal ions in case of chitosan while for the multifunctional composite, the ionic radius is the most dependent parameter. The multifunctional composite was found to be regenerated effectively using EDTA solution for up to five efficient cycles of adsorption/desorption processes.
机译：在这项工作中，已成功制备了壳聚糖，银纳米颗粒（Ag NPs），铜纳米颗粒（Cu NPs）和碳纳米管（CNTs）的多功能纳米复合材料。使用X射线衍射，扫描和透射电子显微镜已确认了该结构。 CNT，Ag NP和Cu NPs在聚合物基体内均匀分布。使用5 g L-1吸附剂量，壳聚糖对Cu（II），Cd（II）和Pb（II）的吸附效率达到60％，而对于多功能复合材料，壳聚糖的吸附效率达到100％，同时减少了吸附剂至1 g L-1。对于多功能复合材料，10分钟就足以从溶液中几乎完全除去金属离子，而对于壳聚糖，效率则相当低。在壳聚糖的情况下，吸附过程符合拟二阶动力学模型和Langmuir等温线的线性关系;在多功能复合材料的情况下，吸附过程符合拟二阶动力学模型以及Langmuir和Freundlich模型的吸附峰。线性形式。发现在壳聚糖的情况下，最大吸附量（Q（max））与金属离子的电极电势值直接相关并很好地拟合，而对于多功能复合材料，离子半径是最相关的参数。发现该多功能复合材料使用EDTA溶液可有效再生多达五个有效的吸附/解吸过程循环。

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