Department of Chemistry and Sophisticated Analytical Instrument Facility, HSB Block, Indian Institute of Technology Madras, Chennai, Tamil Nadu, India.
J Hazard Mater. 2011 Feb 15;186(1):921-31. doi: 10.1016/j.jhazmat.2010.11.100. Epub 2010 Nov 30.
This paper describes a versatile, and simple synthetic route for the preparation of a range of reduced graphene oxide (RGO)-metal/metal oxide composites and their application in water purification. The inherent reduction ability of RGO has been utilized to produce the composite structure from the respective precursor ions. Various spectroscopic and microscopic techniques were employed to characterize the as-synthesized composites. The data reveal that the RGO-composites are formed through a redox-like reaction between RGO and the metal precursor. RGO is progressively oxidized primarily to graphene oxide (GO) and the formed metal nanoparticles are anchored onto the carbon sheets. Metal ion scavenging applications of RGO-MnO(2) and RGO-Ag were demonstrated by taking Hg(II) as the model pollutant. RGO and the composites give a high distribution coefficient (K(d)), greater than 10 L g(-1) for Hg(II) uptake. The K(d) values for the composites are found to be about an order of magnitude higher compared to parent RGO and GO for this application. A methodology was developed to immobilize RGO-composites on river sand (RS) using chitosan as the binder. The as-supported composites are found to be efficient adsorbent candidates for field application.
本文描述了一种通用且简单的合成路线，用于制备一系列还原氧化石墨烯（RGO）-金属/金属氧化物复合材料，并将其应用于水净化。利用 RGO 的固有还原能力，从相应的前体离子制备出复合结构。采用各种光谱和显微镜技术对合成的复合材料进行了表征。数据表明，RGO-复合材料是通过 RGO 与金属前体之间的氧化还原反应形成的。RGO 主要被氧化为氧化石墨烯（GO），形成的金属纳米颗粒被锚定在碳片上。通过以 Hg(II)作为模型污染物，证明了 RGO-MnO2 和 RGO-Ag 的金属离子清除应用。RGO 和复合材料对 Hg(II)的吸附具有很高的分配系数（Kd），大于 10 L g-1。与该应用中的原始 RGO 和 GO 相比，发现复合材料的 Kd 值高一个数量级。开发了一种使用壳聚糖作为粘结剂将 RGO 复合材料固定在河砂（RS）上的方法。所支持的复合材料被发现是用于现场应用的有效吸附剂候选物。
