聚氨酯海绵负载二氧化钛/石墨烯复合蒙脱土漂浮材料可见光降解17α-乙炔基雌二醇  

Floating catalyst based on polyurethane foams modified with TiO_2/graphene-montmorillonite for visible-light degradation of 17α-ethinylestradiol

作　　者：李轶[1,2] 倪凌峰 郭燕飞[1,2] 

机构地区：[1]河海大学环境学院,江苏南京210098 [2]河海大学浅水湖泊综合治理与资源开发教育部重点实验室,江苏南京210098

出　　处：《河海大学学报（自然科学版）》2017年第2期116-121,共6页Journal of Hohai University(Natural Sciences)

基　　金：国家水体污染控制与治理科技重大专项(2012ZX07506-002-2)

摘　　要：将二氧化钛/石墨烯复合蒙脱土材料负载在聚氨酯海绵上,制备了一种新型漂浮光催化材料。采用扫描电子显微镜、透射电子显微镜、能量弥散X射线探测器、X射线衍射仪和紫外-可见漫反射光谱仪等研究材料的表征,结果显示,二氧化钛纳米粒子分布于片状石墨烯表面,光催化活性组分均匀稳定地分布于聚氨酯海绵表面及基体中。该材料的密度约为0.26 g/cm^3,比表面积为17m^2/g,保证了其漂浮性质和对污染物良好的吸附能力。1 g材料对2 mg/L 17α-乙炔基雌二醇(EE2)的吸附能力达到73%,4 h降解率达到76%。此外,经5次循环使用,该材料对EE2的降解效率无明显下降,表明其在实际污染水体修复过程中具有良好的稳定性和可持续利用性。A novel floating photocatalyst based on polyurethane foams modified with TiO2/graphene-montmorillonite was synthesized. The characteristics of the photocatalyst were investigated with a scanning electron microscope, transmission electron microscope, energy-dispersive X-ray spectrometer, X-ray diffraetometer, and UV-visible diffuse reflectance spectroscope. The results showed that TiO2 nanoparticles dispersed on graphene sheets, and photoeatalytic active components uniformly and stably dispersed in the matrix and on the surface of the polyurethane foams. The density and specific surface area of the photocatalyst were 0.26 g/em3 and 17 m2/g, respectively, assuring the floating property of the photoeatalyst and good adsorption capacity of pollutants. The adsorption capacity of 1 g photocatalyst to 2 mg/L 17α-ethinylestradiol degradation efficiency was found to be 76% over a period of 4 h. （EE2） reached 73%, and the maximum EE2 Moreover, no obvious decrease of the degradation efficiency was observed after five cyclic operations. This demonstrated the strong stability and reusability of the photocatalyst for the restoration of polluted water bodies.

关 键 词：可见光 漂浮 聚氨酯 二氧化钛 石墨烯 17Α-乙炔基雌二醇 

分 类 号：O643.36[理学—物理化学]