摘要
以自制三氧化钨(WO_3)、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WO_3/TiO_2-GO,再通过硼氢化钠(NaBH4)还原得到WO_3/TiO_2-还原氧化石墨烯(WO_3/TiO_2-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WO_3/TiO_2粒子均匀分散于rGO表面;rGO的引入能够有效抑制TiO_2晶粒的长大;400、450℃热处理样品中TiO_2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WO_3/TiO_2-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(WO_3)and graphene oxide(GO)as raw materials,tetrabutyl titanate(TBT)as titanium source,citric acid as hydrolysis inhibitor and surfactant,the WO_3/TiO_2-GO composite was fabricated with sol-gel process.And then a WO_3/TiO_2-reductive graphene oxide(WO_3/TiO_2-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 WO_3/TiO_2 nanoparticles would be uniformly dispersed on the surface of the rGO;the introduction of rGO could effectively inhibit the growth of TiO_2nano-particles,the TiO_2 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 WO_3/TiO_2-rGO sample heat-treated at 450 ℃ would have maximal efficiency of photocatalytic degradation of methyl orange,amounting possibly to 95%.
出处
《兰州理工大学学报》
CAS
北大核心
2017年第3期25-29,共5页
Journal of Lanzhou University of Technology
基金
省部共建有色金属先进加工与再利用国家重点实验室开放基金(SKLAB02015010)的资助
关键词
还原氧化石墨烯
二氧化钛
氧化钨
光催化
reduced graphene oxide
titanium dioxide
tungsten trioxide
photocatalysis
