石墨烯氢氧化钴复合催化剂的一步合成及其对酸性橙的催化降解(英文)

Facile Synthesis of Graphene-Cobalt Hydroxide Nanocomposite and Application in Degradation of Acid Orange 7

用一步合成自组装法制备出了氢氧化钴与还原氧化石墨烯(Co(OH)2/rGO)的复合催化剂,并将其用于水中染料的催化降解实验.通过X射线衍射(XRD),激光拉曼(Raman)光谱,透射电镜(TEM),X射线能量色散谱(EDS)以及X射线光电子能谱(XPS)等一系列分析手段对催化剂的结构形貌进行了详细的表征,表征结果证实氢氧化钴很好地附着在还原石墨烯的表面.最后初步考察了催化剂催化单过硫酸钾(PMS)降解酸性橙(AO7)的性能.结果表明,催化剂显示出了高效的催化性能,酸性橙的色度可在12 min内完全去除,总有机碳(TOC)实验也表明染料降解的同时也可获得较高的矿化度.循环稳定性实验表明在进行到第三次实验时,催化剂仍能保持高的催化活性,将酸性橙在16 min内降解完毕.

In this study, a cobalt hydroxide-reduced grephene oxide （Co（OH）2/rGO） composite was synthesized by one-step self-assembly, and used as a catalyst in dye degradation. The catalyst was characterized using X-ray diffraction （XRD）, Raman spectroscopy, transmission electron microscopy （TEM）, energy-dispersive X- ray spectroscopy （EDS）, and X-ray photoelectron spectroscopy （XPS）. The catalyst had well-distributed Co（OH）2 nanoparticles on the reduced graphene oxide surface. The catalytic performance of this hybrid material was investigated for the activation of peroxymonosulfate （PMS）, and used to degrade acid orange 7 （AO7） dye in aqueous solution. The experimental results showed that the composite had high catalytic activity in the degradation of AO7, and 100% decomposition was achieved in less than 12 rain. Total organic carbon （TOC） experiments indicated a high degree of mineralization, suggesting excellent catalytic activity. Stability tests showed that the catalyst was stable in the degradation of AO7 over several runs. AO7 was completely degraded in 16 min in the third run.