Ni(OH)_(2)/石墨烯复合物的制备及其Cr(Ⅵ)吸附  

Preparation of Ni(OH)_(2)/Graphene Composites and Their Cr(Ⅵ)Adsorption

作　　者：赵梦奇[1] 胡文莉 陈德军[1] 米红宇[1] 廖银念[1] ZHAO Mengqi;HU Wenli;CHEN Dejun;MI Hongyu;LIAO Yinnian(College of Chemical Engineering,Xinjiang University)

机构地区：[1]新疆大学化工学院,新疆乌鲁木齐830046

出　　处：《环境科学与技术》2020年第10期90-94,共5页Environmental Science & Technology

基　　金：国家自然科学基金(21968035,51403179,51408522)。

摘　　要：该文以石墨烯为支撑,采用水热法合成了氢氧化镍/石墨烯(Ni(OH)_(2)/GNS)复合材料,其扫描电镜、透射电镜、热重和X-射线粉末衍射表明,在复合材料中平均粒径约1.5μm的花状微球Ni(OH)_(2)均一地生长在石墨烯表面,形成了特殊的三维结构,其中石墨烯所占的质量分数约为20.1%;复合材料Cr(Ⅵ)的吸附性能研究表明其对Cr(Ⅵ)水溶液具有较好的吸附能力,最高去除率约达90%,实验饱和吸附量约为52.5 mg/g,准一级和准二级动力学模型拟合实验数据的相关系数分别为0.943和0.925,相差不大。吸附热力学过程符合Freundlich模型,常温下吸附过程能自发进行。A graphene-supported nickel hydroxide/graphene(Ni(OH)_(2)/GNS)composite was synthesized by hydrothermal method.SEM,TEM,TG and XRD showed that flower-like Ni(OH)_(2) microspheres with an average diameter of ca.1.5μm uniformly grow on the surface of graphene,forming a special three-dimensional structure,and the mass fraction of graphene is about _(2)0.1%.Ni(OH)_(2)/GNS has a good adsorption ability to Cr(Ⅵ)in aqueous solution,the highest removal rate is about 90%,the saturated adsorption capacity is about 52.5 mg/g,and the correlation coefficients of pseudo-first and pseudo-second order kinetic models are 0.943 and 0.925,respectively,and they are not much different.The adsorption thermodynamics process was fitted to Freundlich model,and the adsorption process could be spontaneous at room temperature.

关 键 词：水热法 Ni(OH)_(2)/GNS 复合 Cr(Ⅵ)吸附 

分 类 号：X13[环境科学与工程—环境科学] TB33[一般工业技术—材料科学与工程]