High-performance iron oxide-graphene oxide nanocomposite adsorbents for arsenic removal
High-performance iron oxide-graphene oxide nanocomposite adsorbents for arsenic removal
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DOI：
10.1016/j.colsurfa.2017.02.065
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发表时间：
2017-06
期刊：
影响因子：
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通讯作者：
H. Su;Zhibin Ye;Nuri Hmidi
中科院分区：
文献类型：
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作者：
H. Su;Zhibin Ye;Nuri Hmidi
我们报告了一系列新型氧化铁-氧化石墨烯 (GO) 纳米复合材料的合成，该复合材料具有不同的氧化铁含量 (36-80 wt%)，作为高性能除砷吸附剂。纳米复合材料中的氧化铁是通过在改进的 Hummers 方法制备的 GO 片上共沉淀合成的，其主要特征是平均尺寸为 ca 的无定形纳米粒子的理想形式。 5 纳米。氧化铁的这种独特的无定形纳米颗粒形态有益地赋予纳米复合材料高表面积（氧化铁含量为 80 wt% 的 FeOx-GO-80 高达 341 m2g−1）和主要的中孔结构，从而增加吸附位点并增强砷吸附能力。 FeOx–GO-80 对 As(III) 和 As(V) 的最大砷吸附容量 (qmax) 分别为 147 和 113 mg g−1。这些值是迄今为止报道的所有氧化铁-GO/还原GO复合吸附剂中最高的，并且也与各种复杂合成的氧化铁纳米结构所达到的最佳值相当。更引人注目的是，FeOx–GO-80 还被证明可以几乎完全（>99.98%）去除砷，将浓度从 118（对于 As(III)）或 108（对于 As(V)）降低至 <0.02 µg L−1，远低于世界卫生组织 (WHO) 推荐的饮用水限值 10 µg L−1。优异的吸附性能、低成本和方便的合成使得该系列吸附剂在饮用水净化和废水处理的商业应用中极具前景。
We report the synthesis of a new range of iron oxide–graphene oxide (GO) nanocomposites having different iron oxide content (36–80 wt%) as high-performance adsorbents for arsenic removal. Synthesized by co-precipitation of iron oxide on GO sheets that are prepared by an improved Hummers method, the iron oxide in the nanocomposites is featured primarily in the desirable form of amorphous nanoparticles with an average size of ca. 5 nm. This unique amorphous nanoparticle morphology of the iron oxide beneficially endows the nanocomposites with high surface area (up to 341 m2g−1for FeOx–GO-80 having the iron oxide content of 80 wt%) and predominant mesopore structures, and consequently increased adsorption sites and enhanced arsenic adsorption capacity. FeOx–GO-80 shows high maximum arsenic adsorption capacity (qmax) of 147 and 113 mg g−1for As(III) and As(V), respectively. These values are the highest among all the iron oxide–GO/reduced GO composite adsorbents reported to date and are also comparable to the best values achieved with various sophisticatedly synthesized iron oxide nanostructures. More strikingly, FeOx–GO-80 is also demonstrated to nearly completely (>99.98%) removes arsenic by reducing the concentration from 118 (for As(III)) or 108 (for As(V)) to <0.02 μg L−1, which is far below the limit of 10 μg L−1recommended by the World Health Organization (WHO) for drinking water. The excellent adsorption performance, along with their low cost and convenient synthesis, makes this range of adsorbents highly promising for commercial applications in drinking water purification and wastewater treatment.