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针铁矿/还原氧化石墨烯纳米复合材料在去除废水中铅的适用性

Applicability of Goethite/Reduced Graphene Oxide Nanocomposites to Remove Lead from Wastewater.

作者信息

Gordon-Nuñez Franklin, Vaca-Escobar Katherine, Villacís-García Milton, Fernández Lenys, Debut Alexis, Aldás-Sandoval María Belén, Espinoza-Montero Patricio J

机构信息

Escuela de Ciencias Químicas, Pontificia Universidad Católica del Ecuador, Av. 12 de Octubre 1076, Apartado, 17-01-2184 Quito, Ecuador.

Departamento de Ingeniería Civil y Ambiental, Escuela Politécnica Nacional, Ladrón de Guevara E11·253, PO·Box 17-01-2759 Quito, Ecuador.

出版信息

Nanomaterials (Basel). 2019 Nov 7;9(11):1580. doi: 10.3390/nano9111580.

DOI:10.3390/nano9111580
PMID:31703391
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6915470/
Abstract

Lead ion in drinking water is one of the most dangerous metals. It affects several systems, such as the nervous, gastrointestinal, reproductive, renal, and cardiovascular systems. Adsorption process is used as a technology that can solve this problem through suitable composites. The adsorption of lead (Pb(II)) on graphene oxide (GO) and on two goethite (α-FeOOH)/reduced graphene oxide (rGO) composites (composite 1: 0.10 g GO: 22.22 g α-FeOOH and composite 2: 0.10 g GO: 5.56 g α-FeOOH), in aqueous medium, was studied. The GO was synthesized from a commercial pencil lead. Composites 1 and 2 were prepared from GO and ferrous sulfate. The GO and both composites were characterized by using scanning electron microscopy (SEM), scanning transmission electron microscopy (STEM), Raman spectroscopy, X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), and dynamic light scattering (DLS). The adsorption capacity of Pb(II) on the GO and both composites was evaluated through adsorption isotherms. Composite 1 presented a significant agglomeration of α-FeOOH nanorods on the reduced graphene oxide layers. Meanwhile, composite 2 exhibited a more uniform distribution of nanorods. The adsorption of Pb(II) on the three adsorbents fits the Langmuir isotherm, with an adsorption capacity of 277.78 mg/g for composite 2200 mg/g for GO and 138.89 mg/g for composite 1. Composite 2 emerged as a highly efficient alternative to purify water contaminated with Pb(II).

摘要

饮用水中的铅离子是最危险的金属之一。它会影响多个系统，如神经系统、胃肠道系统、生殖系统、肾脏系统和心血管系统。吸附过程被用作一种可以通过合适的复合材料解决此问题的技术。研究了在水介质中氧化石墨烯（GO）以及两种针铁矿（α-FeOOH）/还原氧化石墨烯（rGO）复合材料（复合材料1：0.10 g GO: 22.22 g α-FeOOH和复合材料2：0.10 g GO: 5.56 g α-FeOOH）对铅（Pb(II)）的吸附情况。GO由商用铅笔芯合成。复合材料1和2由GO和硫酸亚铁制备。通过扫描电子显微镜（SEM）、扫描透射电子显微镜（STEM）、拉曼光谱、X射线衍射（XRD）、傅里叶变换红外光谱（FTIR）和动态光散射（DLS）对GO和两种复合材料进行了表征。通过吸附等温线评估了Pb(II)在GO和两种复合材料上的吸附容量。复合材料1在还原氧化石墨烯层上呈现出α-FeOOH纳米棒的显著团聚。同时，复合材料2表现出纳米棒更均匀的分布。Pb(II)在三种吸附剂上的吸附符合朗缪尔等温线，复合材料2的吸附容量为277.78 mg/g，GO为200 mg/g，复合材料1为138.89 mg/g。复合材料2成为净化受Pb(II)污染水的高效替代品。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7a99/6915470/92903555657f/nanomaterials-09-01580-g013.jpg
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