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Simultaneous adsorption of mercury species from aquatic environments using magnetic nanoparticles coated with nanomeric silver functionalized with l-Cysteine
Chemosphere ( IF 8.8 ) Pub Date : 2021-06-07 , DOI: 10.1016/j.chemosphere.2021.131128
Y Vicente-Martínez 1 , M Caravaca 1 , A Soto-Meca 1
Affiliation  

We introduce a novel, efficient and fast method for the total and simultaneous removal of monomethylmercury, dimethylmercury, ethylmercury and Hg (II) from aquatic environments using magnetic core nanoparticles, coated with metallic nanomeric silver and functionalized with l-Cysteine. As far as the authors know, simultaneous removal has not been achieved previously. The experimental design was based on exploring a wide range of experimental conditions, including pH of the medium (2−12), contact time (up to 20 min), adsorbent dose (50–800 μL) and temperature (293–323 K), in order to achieve the highest adsorption efficiency. The results show that, for a pH equal to 6.2 at room temperature, 400 μL of nanoparticles is sufficient to achieve 100% adsorption efficiency for all the studied Hg species after a contact time of 30 s. The adsorbent was characterized by means of Scanning Electron Microscopy, Energy Dispersive X-ray Analysis, Fourier-Transform Infrared Spectroscopy and a BET test. Moreover, the procedure allows the total recovery and recycling of the nanoparticles using 50 μL of 0.01 M KI. As regards reuse, the adsorbent exhibits no loss of adsorption capacity during the first three adsorption cycles. Thermodynamics reveals that adsorption is of a physicochemical nature, the equilibrium isotherms being described by a Langmuir model for all the Hg species. The ability of the method to simultaneously adsorb all species of mercury present in water, achieving full adsorption in just a few seconds, along with the simple experimental conditions and its cost-effectiveness, strongly support the approach as an alternative to current procedures.



中文翻译:

使用涂有 l-半胱氨酸功能化纳米银的磁性纳米粒子同时吸附水生环境中的汞

我们介绍了一种新颖、高效和快速的方法,用于使用磁核纳米粒子从水生环境中同时去除单甲基汞、二甲基汞、乙基汞和 Hg (II),该纳米粒子涂有金属纳米银并用l功能化。-半胱氨酸。据作者所知,以前还没有实现同时去除。实验设计基于对各种实验条件的探索,包括介质的 pH 值 (2-12)、接触时间(最多 20 分钟)、吸附剂剂量(50-800 μL)和温度(293-323 K) ,以达到最高的吸附效率。结果表明,在室温下 pH 值等于 6.2 时,400 μL 纳米颗粒足以在 30 秒的接触时间后对所有研究的 Hg 物质实现 100% 的吸附效率。通过扫描电子显微镜、能量色散X射线分析、傅立叶变换红外光谱和BET测试表征吸附剂。此外,该程序允许使用 50 μL 的 0.01 M KI 对纳米粒子进行总回收和再循环。至于再利用,吸附剂在前三个吸附循环中没有表现出吸附容量的损失。热力学表明吸附具有物理化学性质,平衡等温线由所有 Hg 物质的 Langmuir 模型描述。该方法能够同时吸附水中存在的所有种类的汞,在短短几秒钟内实现完全吸附,加上简单的实验条件和成本效益,强烈支持该方法作为当前程序的替代方案。

更新日期:2021-06-11
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