TiO_(2)-rGO紫外光催化臭氧耦合高效降解双酚A的研究  

The Efficient Degradation of Bisphenol A with Ozonation Photocatalyzed by TiO_(2)-rGO Composites under UV Irradiation

作　　者：朱锡淼[1] 刘金华 廖高祖[1] 冷晟萌 许晓春 方建章[1] ZHU Ximiao;LIU Jinhua;LIAO Gaozu;LENG Chengmeng;XU Xiaochun;FANG Jianzhang(School of Environment,South China Normal University,Guangzhou 510006,China;Jiangmen Solid Waste Treatment Co.,Ltd.,Jiangmen 529000,China;Guangdong Lingxiu Technology Co.,Ltd.,Guangzhou 510530,China)

机构地区：[1]华南师范大学环境学院,广州510006 [2]江门市固体废物处理有限公司,江门529000 [3]广东岭秀科技有限公司,广州510530

出　　处：《华南师范大学学报（自然科学版）》2022年第4期40-47,共8页Journal of South China Normal University(Natural Science Edition)

基　　金：广东省基础与应用基础研究基金项目(2022A1515011014);广东省企业科技特派员项目(GDKTP2021002500)。

摘　　要：采用液相沉积-煅烧法制备二氧化钛-还原氧化石墨烯(TiO_(2)-rGO)复合光催化剂。利用扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X射线衍射仪(XRD)、比表面积与孔隙率分析仪(BET)和紫外-可见漫反射分光光度计(UV-Vis DRS)等对所制备的催化剂进行表征分析。以双酚A(BPA)为模拟污染物,考察了TiO_(2)-rGO的光催化臭氧氧化降解性能,并通过活性物种捕获实验探究反应机制。结果表明,锐钛矿型TiO_(2)纳米颗粒成功附着在石墨烯上,颗粒直径约为20 nm;当前驱体溶液中氧化石墨投加量为0.02 g时,样品催化活性最高,反应45 min后双酚A被完全矿化,经过5次循环使用后,仍保持高效催化性能;TiO_(2)-rGO催化活性的提高主要归因于引入石墨烯后提高了光生载流子的分离效率,促进了光催化与臭氧氧化协同降解;在反应过程中,空穴(h+)和羟基自由基(·OH)是主要的活性物种,·OH对BPA的降解起主导作用。TiO_(2)-rGO composites were synthesized with the liquid phase deposition and calcination method.The as-prepared photocatalysts were characterized with scanning electron microscopy(SEM),transmission electron microscopy(TEM),X-ray diffractometer(XRD),specific surface and porosity analyzer(BET)and ultraviolet-visible diffuse reflectance spectrophotometer(UV-Vis DRS).The degradation performance of ozonation photocata-lyzed by TiO_(2)-rGO was investigated using bisphenol A(BPA)as the model pollutant.The reaction mechanism was further explored through the active species trapping experiment.The results showed that anatase TiO_(2) nanoparticles about 20 nm in diameter had been successfully anchored on the surface of graphene.The sample obtained when 0.02 g graphite oxide was added in precursor solution exhibited the highest activity and BPA was completely mineralized within 45 min.The catalytic activity of TiO_(2)-rGO still showed efficient performance after recycling for five consecutive runs.The catalytic activity of TiO_(2)-rGO was enhanced owing to the improved separation efficiency of photo-generated charges through the introduction of rGO,which benefited the synergistic degradation of photocata-lysis and ozonation.In the reaction process,holes(h+)and hydroxyl radical(·OH)were the main active species and·OH played a dominant role in BPA degradation.

关 键 词：TiO_(2)-rGO 光催化臭氧氧化 协同作用 双酚A 

分 类 号：O644[理学—物理化学]