Neelgund Gururaj M, Bliznyuk Valery N, Oki Aderemi
Department of Chemistry, Prairie View A&M University, Prairie View, TX 77446, USA.
Department of Environmental Engineering and Earth Science, Clemson University, Clemson, SC 29634, USA.
Appl Catal B. 2016 Jun 15;187:357-366. doi: 10.1016/j.apcatb.2016.01.009.
Herein, we present a novel acid-less synthetic approach for polymerization of aniline synchronized with reduction of graphene oxide to graphene. This method provides uniform deposition of ordered polyaniline nanotubes over the surface of graphene nanosheets. The synthesized graphene-polyaniline nanocomposite has the ability of complete removal of harmful dyes commonly used in industry: such as methyl orange, methylene blue, and rhoadmine B from the waste water under the exposure to natural sunlight. The system can be used as an efficient solar energy operated photocatalyst due to effective suppression of recombination of the charge carriers. The unique spatial structure of the graphene-polyaniline nanocomposite has high chemical stability, can be recycled after photolysis, and allows using in multiple cycles without reduction in its photocatalytic activity. In addition, the graphene-polyaniline nanocomposite exhibits strong near-infrared (NIR) absorption, good photothermal stability, as well as shows substantial thermal energy generation under exposure to 808 or 980 nm NIR lasers. The electrical conductivity of polyaniline nanotubes is improved as a result of their conjugation with graphene nanosheets in the nanocomposite. Owing to its outstanding photocatalytic activity and chemical stability, the reported graphene-polyaniline nanocomposite has a great potential in purification of industrially generated waste water.
在此，我们提出了一种新颖的无酸合成方法，用于苯胺的聚合反应，同时将氧化石墨烯还原为石墨烯。该方法可在石墨烯纳米片表面均匀沉积有序的聚苯胺纳米管。合成的石墨烯-聚苯胺纳米复合材料能够在自然阳光照射下，完全去除工业废水中常用的有害染料，如甲基橙、亚甲基蓝和罗丹明B。由于有效抑制了电荷载流子的复合，该体系可作为一种高效的太阳能光催化剂。石墨烯-聚苯胺纳米复合材料独特的空间结构具有高化学稳定性，光解后可回收利用，并能多次循环使用而不降低其光催化活性。此外，石墨烯-聚苯胺纳米复合材料表现出强烈的近红外（NIR）吸收、良好的光热稳定性，并且在808或980nm近红外激光照射下能产生大量热能。由于纳米复合材料中聚苯胺纳米管与石墨烯纳米片共轭，其电导率得到提高。由于其出色的光催化活性和化学稳定性，所报道的石墨烯-聚苯胺纳米复合材料在工业废水净化方面具有巨大潜力。
