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首页> 美国卫生研究院文献>Springer Open Choice >Enhanced chromium (VI) removal using activated carbon modified by zero valent iron and silver bimetallic nanoparticles
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Enhanced chromium (VI) removal using activated carbon modified by zero valent iron and silver bimetallic nanoparticles

机译：使用零价铁和银双金属纳米粒子改性的活性炭增强的铬（VI）去除

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摘要

Recently, adsorption process has been introduced as a favorable and effective technique for the removal of metal ions from aqueous solutions. In the present study, bimetallic nanoparticles consisting of zero valent iron and silver were loaded on the activated carbon powder for the preparation of a new adsorbent (PAC-Feo/Ag). The above adsorbent was characterized by using XRD, SEM and TEM techniqes. Experimental data were exploited for kinetic, equilibrium and thermodynamic evaluations related to the adsorption processes. The Cr(VI) adsorption process was found to be favorable at pH 3 and it reached equilibrium state within 60 min. The stirring rate did not have a significant effect on the adsorption efficiency. Furthermore, the monolayer adsorption capacity of Cr(VI) based on the Langmuir model was measured to be 100 mg/g. The experimental equilibrium data were fitted to the Freundlich adsorption and pseudo second-order models. According to the thermodynamic study, the adsorption process was spontaneous and endothermic in nature, indicating the adsorption capacity increases with increasing the temperature. The results also revealed that the synthesized composite can be potentially applied as a magnetic adsorbent to remove Cr(VI) contaminants from aqueous solutions.
机译：近来，已经引入吸附方法作为从水溶液中去除金属离子的有利且有效的技术。在本研究中，将由零价铁和银组成的双金属纳米颗粒负载在活性炭粉末上，以制备新的吸附剂（PAC-Fe o / Ag）。通过使用XRD，SEM和TEM技术对上述吸附剂进行表征。利用实验数据进行了与吸附过程有关的动力学，平衡和热力学评估。发现Cr（VI）的吸附过程在pH值为3时是有利的，并且在60分钟内达到平衡状态。搅拌速率对吸附效率没有显着影响。此外，根据Langmuir模型测得的Cr（VI）的单层吸附容量为100 mg / g。实验平衡数据拟合到Freundlich吸附和伪二级模型。根据热力学研究，吸附过程本质上是自发的和吸热的，表明吸附能力随温度的升高而增加。结果还表明，合成的复合材料可潜在地用作磁性吸附剂，以从水溶液中去除Cr（VI）污染物。

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