以自制三氧化钨(WO3)、氧化石墨烯(GO)为原料,钛酸四丁酯(TBT)为钛源,柠檬酸为水解抑制剂和表面活性剂,采用溶胶-凝胶法制备WO3/TiO2-GO,再通过硼氢化钠(NaBH4)还原得到WO3/TiO2-还原氧化石墨烯(WO3/TiO2-rGO)三元复合材料.通过X射线衍射(XRD)、透射电镜(TEM)对样品进行分析表征;研究GO质量分数、热处理温度对复合材料结构和甲基橙降解效率的影响.结果表明:纳米WO3/TiO2粒子均匀分散于rGO表面;rGO的引入能够有效抑制TiO2晶粒的长大;400、450 ℃热处理样品中TiO2为锐钛矿相,随着热处理温度的升高,晶体结构由锐钛矿晶相向金红石晶相转变,同时微晶的颗粒尺寸增加,晶型转变温度约为500 ℃;当GO质量分数为10%时,450 ℃热处理的WO3/TiO2-rGO样品光催化降解甲基橙效率最高,可达95%以上.%Taking self-prepared tungsten trioxide(WO3) and graphene oxide(GO) as raw materials, tetrabutyl titanate(TBT) as titanium source, citric acid as hydrolysis inhibitor and surfactant, the WO3/TiO2-GO composite was fabricated with sol-gel process.And then a WO3/TiO2-reductive graphene oxide (WO3/TiO2-rGO) ternary composite was obtained by means of sodium borohydride(NaBH4) reduction.The composite sample was analyzed and characterized with x-ray diffraction(XRD) and transmission electron microscopy(TEM).The effect of GO addition amount and heat-treatment temperature on the structure of the composite and its degradation efficiency of methyl orange was investigated.The result showed that WO3/TiO2 nanoparticles would be uniformly dispersed on the surface of the rGO;the introduction of rGO could effectively inhibit the growth of TiO2 nano-particles, the TiO2 in the composite sample heat-treated at 400, 450 ℃ would be of anatase phase, and with increasing the heat-treatment temperature, the crystal structure would transform from anatase crystal phase into rutile one and, meantime, the crystallite size would grow and the critical line transformation temperature would be about 500 ℃.When the addition amountof GO was 10%, the WO3/TiO2-rGO sample heat-treated at 450 ℃ would have maximal efficiency of photocatalytic degradation of methyl orange, amounting possibly to 95%.
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