Fabrication of Hierarchical Layer-by-Layer Assembled Diamond-based Core-Shell Nanocomposites as Highly Efficient Dye Absorbents for Wastewater Treatment.
Fabrication of Hierarchical Layer-by-Layer Assembled Diamond-based Core-Shell Nanocomposites as Highly Efficient Dye Absorbents for Wastewater Treatment.
复制标题
分层层状组装的金刚石核壳纳米复合材料的制备作为废水处理的高效染料吸收剂
DOI：
10.1038/srep44076
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发表时间：
2017-03-08
影响因子：
4.6
通讯作者：
Yan X
中科院分区：
文献类型：
--
作者：
Zhao X;Ma K;Jiao T;Xing R;Ma X;Hu J;Huang H;Zhang L;Yan X
金刚石基分级复合材料的有效化学改性和自组装对于金刚石的广泛应用至关重要。在此，我们报道了新型核-壳金刚石基纳米复合材料的制备，用于通过逐层（LbL）组装策略对废水处理的染料吸附。所报道的复合材料的合成开始于通过金刚石@石墨的氧化对金刚石@氧化石墨烯复合材料进行化学改性来对微米金刚石进行羧基官能化。然后将端羧基的微金刚石交替浸泡在含胺聚乙烯亚胺和含羧基聚丙烯酸的水溶液中，在金刚石表面形成吸附层。在含胺和含羧基的聚合物的溶液中的交替（自限性）浸渍持续进行，直到在微金刚石周围形成所需数量的壳层。所得到的核壳纳米复合材料成功地合成和表征的形态和光谱技术，表现出较高的表面积和介孔结构，良好的染料吸附能力比无孔固体金刚石颗粒。以两种模型染料为污染物进行废水处理实验，结果表明LBL组装的核壳纳米复合材料具有很强的吸附能力。因此，目前LBL组装的金刚石基复合材料的工作为开发金刚石混合物以及纳米材料用于废水处理应用提供了新的替代方案。
The effective chemical modification and self-assembly of diamond-based hierarchical composite materials are of key importance for a broad range of diamond applications. Herein, we report the preparation of novel core-shell diamond-based nanocomposites for dye adsorption toward wastewater treatment through a layer-by-layer (LbL) assembled strategy. The synthesis of the reported composites began with the carboxyl functionalization of microdiamond by the chemical modification of diamond@graphene oxide composite through the oxidation of diamond@graphite. The carboxyl-terminated microdiamond was then alternatively immersed in the aqueous solution of amine-containing polyethylenimine and carboxyl-containing poly acrylic acid, which led to the formation of adsorption layer on diamond surface. Alternating (self-limiting) immersions in the solutions of the amine-containing and carboxyl-containing polymers were continued until the desired number of shell layers were formed around the microdiamond. The obtained core-shell nanocomposites were successfully synthesized and characterized by morphological and spectral techniques, demonstrating higher surface areas and mesoporous structures for good dye adsorption capacities than nonporous solid diamond particles. The LbL-assembled core-shell nanocomposites thus obtained demonstrated great adsorption capacity by using two model dyes as pollutants for wastewater treatment. Therefore, the present work on LbL-assembled diamond-based composites provides new alternatives for developing diamond hybrids as well as nanomaterials towards wastewater treatment applications.