GO/介孔TiO2复合材料的制备及性能研究

Preparation and Properties of GO/TiO2 Mesoporous Composites

以硫酸钛为钛源、聚乙二醇为模板剂,采用水热法制备了一系列具有吸附及光催化双功能的GO（氧化石墨烯）/介孔Ti O2复合材料,采用XRD、TEM、BET和紫外-可见漫反射等测试手段对所制备系列样品的微观结构、孔结构和光谱学性能进行了初步表征,并以甲基橙溶液为目标污染物测试其吸附性能及光催化活性,进而探讨了GO/介孔Ti O2复合材料的最佳制备条件。结果表明,GO/介孔Ti O2复合材料中氧化钛均为锐钛矿相,晶粒尺寸均在7 nm左右,系列复合材料均属于LangmuirⅣ型介孔结构,GO的复合适当拓宽体系光响应范围;水热温度为110℃、水热时间为24 h、GO的复合比为5 wt%时,对甲基橙溶液的吸附及光催化活性最强,1 h内降解率可达100%。

A series of GO/TiO2 mesoporous composites that have bi-functions of absorption and photocatalytic properties were pre- pared by hydrothermal method using titanium sulfate as titanium source and polyethylene glycol as template agent.The microstruc- ture,pore structure and spectroscopic properties of as-prepared GO/TiO2 samples were thoroughly characterized by X-ray power diffraction （ XRD）, transmission electron microscopy （ TEM ）, BET, ultraviolet-visible spectrometer.And the methyl orange solution was used as the target pollutant to test the adsorption performance and photoeatalytic activity of degradation of organic pollutants. The best preparation condition for GO/TiO2 composite was then investigated using the adsorption performance and photocatalytic activity as indicators.The results showed that the as-obtained GO/TiO2 composites were all in anatase phase,and their grain sizes were about 7 nm,and had the Langmuir 1V pore structures.Compositing titanium dioxide with graphene oxide can broaden its light response range.Results found that GO （ 5.0 wt% ） -TiO2 prepared under the hydrothermal temperature of 110 ~C and reaction time of 24 h had the best adsorption performance and photocatalytic activity of degrading methyl orange, and the degradation rate can reach up to 100% within 1 h.