纳米氧化石墨烯复合材料的制备及重金属废水处理研究  

Study on preparation of nanometer graphite oxide composites andtreatment of heavy metal wastewater

作　　者：段翠清 任珺[1,2,4] 陶玲 DUAN Cuiqing;REN Jun;TAO Ling(Key Laboratory of Yellow River Water Environment in Gansu Province,Lanzhou Jiaotong University,Lanzhou 730070,China;Institute of Environmental Ecology School of Environmental and Municipal Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China;Gansu Academy of Social Sciences,Lanzhou 730070,China;Gansu Hanxing Environmental Protection Co.,Ltd.,Lanzhou 730070,China)

机构地区：[1]兰州交通大学甘肃省黄河水环境重点实验室,兰州730070 [2]兰州交通大学环境与市政工程学院环境生态研究所,兰州730070 [3]甘肃省社会科学院,兰州730070 [4]甘肃瀚兴环保科技有限公司,兰州730070

出　　处：《功能材料》2023年第12期12085-12090,共6页Journal of Functional Materials

基　　金：甘肃省教育厅产业支撑计划项目(2021CYZC-31);甘肃省黄河水环境重点实验室基金(20JR2RA002,21YRWEK007,21YRWEG003);兰州市人才创新创业项目(2021-RC-41)。

摘　　要：以改进的Hummers法制备了纳米氧化石墨烯(GO),以乙二胺四乙酸(EDTA)为改性剂,制备了功能化GO复合材料。通过XRD、SEM、FT-IR对功能化GO复合材料的晶格结构、微观形貌和官能团进行了表征,并以此作为吸附剂,测试了不同pH值、初始浓度、吸附时间等吸附环境对含Cd的重金属废水吸附性能的影响。结果表明,EDTA表面具有丰富的羟基、羧基等含氧基团,嫁接到GO表面后使GO表面的活性点位增多,Cd(Ⅱ)被功能化GO复合材料表面的活性点位所吸附后沉积在了原有的沟槽中,使复合材料的表面变得光滑。当pH=6时,功能化GO复合材料对含Cd重金属废水的吸附容量和去除率达到最大值,分别为45.8 mg/g和95.3%;在初始浓度为120 mg/L时,吸附容量和去除率达到了最大值,分别为66.5 mg/g和96.3%;在吸附时间为60 min时,可达饱和吸附,吸附容量和去除率达到最高值,分别为78.0 mg/g和98.5%。经过5次重复使用后,吸附容量可保持在23.8 mg/g,去除率保持在85.4%,具有优异的循环性能。Nano graphite oxide(GO)was prepared by an improved Hummers method,and functionalized GO composites were prepared with ethylenediaminetetraacetic acid(EDTA)as modifier.The lattice structure,microstructure,and functional groups of functionalized GO composite materials were characterized by XRD,SEM,and FT-IR,and were used as adsorbents to test the effects of different pH values,initial concentrations and adsorption times on the adsorption performance of heavy metal wastewater containing Cd.The results showed that the surface of EDTA was rich in oxygen-containing groups such as hydroxyl and carboxyl groups.After grafting onto the GO surface,the number of active sites on the GO surface increased.Cd(Ⅱ)was adsorbed by the active sites on the functionalized GO composite material surface and deposited in the original grooves,making the surface of the composite material smooth.When the pH value was 6,the adsorption capacity and removal rate of functionalized GO composite materials for Cd containing heavy metal wastewater reached their maximum values,which were 45.8 mg/g and 95.3%,respectively.At an initial concentration of 120 mg/L,the adsorption capacity and removal rate reached their maximum values of 66.5 mg/g and 96.3%,respectively.When the adsorption time was 60 min,saturation adsorption could be achieved,and the adsorption capacity and removal rate reached the highest values,which were 78.0 mg/g and 98.5%,respectively.After 5 repeated uses,the adsorption capacity could be maintained at 23.8 mg/g,and the removal rate could be maintained at 85.4%,demonstrating excellent cycling performance.

关 键 词：纳米氧化石墨烯 功能化 EDTA 重金属废水 去除率 循环性能 

分 类 号：TB332[一般工业技术—材料科学与工程]