Green Synthesized Superparamagnetic Iron Oxide Nanoparticles for Water Treatment with Alternative Recyclability
Green Synthesized Superparamagnetic Iron Oxide Nanoparticles for Water Treatment with Alternative Recyclability
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DOI：
10.1016/j.molliq.2022.118983
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发表时间：
2022-03
影响因子：
6
通讯作者：
Yohannes W. Getahun;J. Gardea-Torresdey;F. Manciu;Xiujun Li;A. El-Gendy
中科院分区：
文献类型：
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作者：
Yohannes W. Getahun;J. Gardea-Torresdey;F. Manciu;Xiujun Li;A. El-Gendy
广泛使用的水处理方法是以化学物质为基础的，这些化学物质会留下不需要的残留杂质，从而对健康造成长期影响。因此，功能化磁性纳米颗粒(MNPs)被用来填充这些缝隙，并通常用于污染水域中的金属吸附。这些MNPs的高表面积与体积比使其具有更大的污染物吸附能力。本研究以能够吸收多种有机污染物的植物化学物质为原料，采用一种新型的绿色方法合成了功能化的氧化铁MNPs。在这里，我们研究了用一种简单的浸渍技术从植物粗提物中合成氧化铁MNPs。在乙醇的超临界条件下进行的热处理进一步支持了反应，完成了还原过程，得到了超顺磁性的氧化铁纳米颗粒。X-射线衍射仪的结果表明：针铁矿(处理前为-Y0PL)、磁铁矿(处理后为-Y0PR)和磁铁矿(处理后为-Y0PRP)的平均粒径分别为277、29、45 nm。植物化学物质增加了纳米颗粒的尺寸并改变了其质地。测量了Y0PR、Y0PRP和Y0PL的磁化强度与外加磁场的关系，结果表明，Y0PR、Y0PRP和Y0PL的磁化强度与外加磁场的关系表现出超顺磁性，其磁化强度分别为：M_s=0.44(Hc_e=0.123 Oe)，M_s=36(H_c=0.133 Oe)，M_s=13(H_c=0.44 Oe)emu/g。考察了纳米颗粒对亚甲基蓝(10-140mg·L)和4-硝基(0.5mM~1mM)的吸附/还原效率。合成的绿色纳米颗粒在很短的时间内对模型染料的吸附效率可达80%以上，在最佳条件下吸附效率可达94%。此外，这项工作引入了成功的替代回收，特别是通过将弱磁性纳米颗粒生长在聚乙烯醇固体载体的表面上。因此，本研究制备的绿色合成的超顺磁性氧化铁纳米颗粒具有合成简单、成本低、环境友好的特点。
Widely used water treatment methods are based on chemicals that leave residual unwanted impurities, instigating long-term health impacts. Hence, functionalizedmagneticnanoparticles (MNPs) have been used to fill those gabs and are commonly used for metallic adsorption in contaminated waters. High surface to volume ratio of those MNPs allows for a larger capacity of pollutant adsorption. In this study, functionalized iron oxide MNPs are synthesized by a novel green approach using plant phytochemicals with the capability of absorbing multiple organic pollutants. Herein, we studied synthesis of iron oxide MNPs with crude plant extracts using a simple maceration technique. The reaction was supported further by heat treatments at the supercritical condition of ethanol to complete the reduction process to superparamagnetic iron oxide nanoparticles. Our XRD result shows formation of spherical and cubic goethite (before treatment-Y0PL), magnetite (after treatment -Y0PR) and magnetite (after treatment and functionalization-Y0PRP) with an average crystalline size 277, 29, 45 nm respectively. Phytochemicals increased the size and altered texture of nanoparticles. The magnetic properties were measured for magnetization dependence on external magnetic field to show superparamagnetic behavior with Ms = 44 (Hc = 123 Oe), 36 (Hc = 133 Oe) and 13 (Hc = 44 Oe) emu/g for Y0PR, Y0PRP and Y0PL, respectively. Absorption/reduction efficiency of nanoparticles was studied against MB (10–140 mg/L) and 4-NA (0.5–1 mM). As synthesized green nanoparticles absorbed the model dyes above 80% efficiency under a wide range of conditions in a very short time and 94% under optimum conditions. Moreover, this work introduces successful alternative recyclability in particular for weakly magnetic nanoparticles by growing them on the surface of polyvinyl alcohol solid support. Therefore, the green synthesized superparamagnetic iron oxide nanoparticles prepared in this study are easy to synthesize and cost-effective and enviro-friendly water treatment agents.