Removal of Cr(VI) from aqueous solutions via reduction and absorption by green synthesized iron nanoparticles
Removal of Cr(VI) from aqueous solutions via reduction and absorption by green synthesized iron nanoparticles
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通过绿色合成铁纳米颗粒的还原和吸收去除水溶液中的 Cr(VI)
DOI：
10.1016/j.jclepro.2017.12.026
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发表时间：
2018-03-01
影响因子：
11.1
通讯作者：
Chen, Zuliang
中科院分区：
文献类型：
--
作者：
Jin, Xiaoying;Liu, Yong;Chen, Zuliang
以桉叶提取物为原料，采用绿色合成了铁基纳米粒子（Fe-NPs）。随后，在不同的实验条件下，包括温度、pH、初始Cr（VI）浓度和Fe-NPs负载，Fe-NPs用于从水溶液中去除Cr（VI）。在最佳实验条件下，总铬去除率为84.6%，Cr（VI）去除率为98.6%。即使重复使用四次，Cr（VI）的去除率仍然相对较高（55.7%）。纳米粒子的特点是使用一系列的技术，如DLS，EDS，FTIR，SEM和XRD之前和之后与铬的相互作用。这一表征揭示了铬及其氧化物或络合物在Fe-NP表面上的存在，表明发生了Cr（VI）的吸附，并提出了Cr（VI）去除的机理。吸附动力学符合Langmuir模型（R-2 = 0.999），q（m）= 20.5 mg g（-1），B = 3.6 L mg（-1）。(C)2017爱思唯尔有限公司版权所有
Iron-based nanoparticles (Fe-NPs) were successfully green synthesized using eucalyptus leaf extracts. Subsequently Fe-NPs were used to remove Cr(VI) from aqueous solution under varying experimental conditions, including temperature, pH, initial Cr(VI) concentration and Fe-NPs loading. Under optimal experimental conditions, 84.6% of total chromium and 98.6% of Cr(VI) were removed. The removal efficiency of Cr(VI) was still relatively high (55.7%) even after reusing the material four times. Nanoparticles were characterized using a range of techniques such as DLS, EDS, FTIR, SEM and XRD both before and after interaction with Cr. This characterization revealed the existence of chromium and its oxide or complex on the surface of Fe-NPs, indicating that adsorption of Cr(VI) was occurring and a mechanism of Cr(VI) removal was proposed. Batch experiments revealed that the reduction kinetics followed a pseudo second order rate model whereas adsorption was best fitted to the Langmuir model (R-2 = 0.999) with q(m) = 20.5 mg g(-1) and b = 3.6 L mg(-1). (C) 2017 Elsevier Ltd. All rights reserved.