煤基石墨烯促进TiO_(2)光催化降解有机物  

Coal-based graphene as a promoter of TiO_(2)catalytic activity for the photocatalytic degradation of organic dyes

作　　者：刘国阳[1,2] 李可可 贾嘉[1] 张亚婷 LIU Guo-yang;LI Ke-ke;JIA Jia;ZHANG Ya-ting(College of chemistry and chemical engineering,Xi’an University of Science and Technology,Xi’an 710054,China;National Engineering Research Center of Coal Preparation and Purification,China University of Mining&Technology,Xuzhou 221116,China)

机构地区：[1]西安科技大学化学与化工学院,陕西西安710054 [2]中国矿业大学,国家煤加工与洁净化工程技术研究中心,江苏徐州221116

出　　处：《新型炭材料（中英文）》2022年第6期1172-1182,共11页New Carbon Materials

基　　金：国家煤加工与洁净化工程技术研究中心开放基金(2018NERCCPP-B06);NSFC-山西煤基低碳联合基金(U1810113);陕西省自然科学基金-陕煤联合基金(2019JLP-12).

摘　　要：石墨烯协同TiO_(2)光催化降解有机物是一种很有前景的解决水体污染问题的方法。本文以低成本煤炭作为石墨烯碳源,成功地制备了TiO_(2)-石墨烯复合催化剂。利用扫描电子显微镜、原子力显微镜、X射线衍射仪和拉曼光谱仪等研究了TiO_(2)-石墨烯复合催化剂的微观结构和形貌。煤基石墨烯的引入促进了TiO_(2)光催化降解有机物的反应。特别是在水热还原法制备的TiO_(2)-石墨烯催化剂中,TiO_(2)堆积在石墨烯片层结构上形成层状结构。由于石墨烯的引入,复合催化剂表现出良好的导电性和光电响应特性,并展示出较高的光催化活性。Graphene oxide(GO)obtained from coal-based graphite by the Hummers method was hydrothermally treated to obtain reduced GO(rGO).TiO_(2)was mixed with aqueous suspensions of GO and rGO and dried at 70 oC to obtain GO-TiO_(2)and rGO-TiO_(2)with 95%(mass fraction)TiO_(2).TiO_(2)was also combined with a GO suspension by hydrothermal treatment to obtain rGO-hTiO_(2)with 95%TiO_(2).The three hybrids were used as catalysts for the photocatalytic degradation of rhodamine B(Rh B)and methyl orange(MO).Of the three materials,rGO-hTiO_(2)had the highest catalytic activity for the degradation of Rh B and MO under visible light irradiation.The reasons for having the best catalytic activity are that the incorporation of rGO into TiO_(2)helps increase its adsorption capacities for Rh B and MO as evidenced by adsorption in dark,and a narrowing of the TiO_(2)band gap as revealed by diffuse UV reflectance spectroscopy.This reduces the rate of recombination of electron–hole pairs by there being intimate contact between the TiO_(2)particles and rGO,forming Ti-O-C bonds as confirmed by XPS,with the TiO_(2)particles being uniformly decorated on the rGO sheets.

关 键 词：煤基石墨烯 水热法 光催化降解 TiO_(2) 

分 类 号：TB33[一般工业技术—材料科学与工程]