光降解苯酚用RGO-TiO_(2)纳米复合材料的制备及性能表征

Preparation and characterization ofRGO-TiO_(2)nanocomposites for photodegradation of phenol

通过改进的Hummers法制备了氧化石墨烯,用溶胶-凝胶法结合热处理工艺制备出了RGO-TiO_(2)纳米复合材料。研究了复合材料的晶体结构、微观形貌以及RGO掺杂量对复合材料催化性能的影响。结果表明,RGO-TiO_(2)纳米复合材料是标准的锐钛矿型,纳米TiO_(2)颗粒均匀分布在片层状石墨烯的表面,结合良好;红外分析表明,3%RGO-TiO_(2)纳米复合材料中石墨烯和TiO_(2)以化学结合的形式生成了稳定的Ti-O-C键;随着RGO掺杂量的增加,RGO-TiO_(2)纳米复合材料对苯酚的去除率先升高后降低,3%RGO-TiO_(2)纳米复合材料在12 h时去除率最高为93.9%,其中在pH值=3的酸性条件下12 h时刻对苯酚的去除率最高达到96.1%,去除率要明显高于中性和碱性环境。

Graphene oxide was prepared by improved Hummers method.RGO-TiO_(2) nanocomposites were prepared by sol-gel process combined with heat treatment process.The effects of crystal structure,micro morphology and RGO doping on the catalytic properties of the composites were studied.The results showed that RGO-TiO_(2) nanocomposites were standard anatase,and nano-TiO_(2) particles were evenly distributed on the surface of lamellar grapheme and good combination.Infrared analysis showed that graphene and TiO_(2) in 3%RGO-TiO_(2) nanocomposites formed stable Ti-O-C bond in the form of chemical combination.With the increase of RGO doping,the removal of phenol by RGO-TiO_(2) nanocomposites increased first and then decreased,and the highest removal rate of 3%RGO-TiO_(2) nanocomposites was 93.9%at 12 h.The removal rate of phenol reached 96.1%at 12 h under the acidic condition of pH=3,which was significantly higher than that in neutral and alkaline environment.