电场辅助α-磷酸锆/氧化石墨烯复合材料吸附Sr^(2+)  

Electric-field assisted adsorption of Sr^(2+)onα-zirconium phosphate/graphene oxide composites

作　　者：汪媛 杨沛霖 赵茂杰 唐维汕 何平[1] 董发勤[2] WANG Yuan;YANG Peilin;ZHAO Maojie;TANG Weishan;HE Ping;DONG Faqin(School of Materials and Chemistry,Southwest University of Science and Technology,Mianyang 621010,China;Key Laboratory of Solid Waste Treatment and Resource Recycle,Ministry of Education,Mianyang 621010,China)

机构地区：[1]西南科技大学材料与化学学院,四川绵阳621010 [2]固体废物处理与资源化教育部重点实验室,四川绵阳621010

出　　处：《化工环保》2023年第3期331-338,共8页Environmental Protection of Chemical Industry

基　　金：国家自然科学基金项目(51602267,41802037);西南科技大学微纳米颗粒应用研究国际科技合作实验室项目(19MNA001)。

摘　　要：采用水热法制备了α-磷酸锆(α-ZrP)/氧化石墨烯(GO)纳米复合材料,采用XRD、SEM、EDX、FTIR和XPS对其进行了表征,并将其制成电极,考察了其在电场辅助下对Sr^(2+)的吸附性能。表征结果显示,纳米片状的α-ZrP在具有大比表面积的GO表面生长,团聚现象减少。实验结果表明:在α-ZrP与GO质量比9∶1、外加电压1.2 V、溶液pH 7.0的条件下,采用α-ZrP/GO吸附50 mg/L SrCl2溶液120 min,Sr^(2+)吸附量可达45.28 mg/g,高于纯α-ZrP和GO,约为无电场吸附时的2倍;α-ZrP/GO具有良好的稳定性,可循环使用,5次循环后的Sr^(2+)吸附量仍保持原吸附量的88%;α-ZrP/GO对Sr^(2+)的吸附符合准二级动力学模型和Langmuir等温吸附模型,吸附过程以离子交换反应的化学吸附为主,存在单层吸附。α-Zirconium phosphate(α-ZrP)/graphene oxide nanocomposites(GO)were prepared by hydrothermal method and characterized by XRD,SEM,EDX,FTIR and XPS.The adsorption capability of the electrode made ofα-ZrP/GO on Sr^(2+)was investigated under electric-field assistance.The characterization results show that nanoflakeα-ZrP grows on the surface of GO with large specific surface area,and the agglomeration phenomenon is reduced.The experimental results show that:Under the conditions of mass ratio ofα-ZrP to GO 9∶1,applied voltage 1.2 V,solution pH 7.0,SrCl2 mass concentration 50 mg/L and adsorption time 120 min,the Sr^(2+)adsorption amount is up to 45.28 mg/g,which is higher than that of pureα-ZrP and GO,and is about two times as much as that without electric field;α-ZrP/GO has good stability and recyclability,and the Sr^(2+)adsorption amount remains 88%of the original adsorption amount after 5 cycles;The adsorption of Sr^(2+)onα-ZrP/GO conforms to the quasi-second-order kinetic model and Langmuir isothermal adsorption model,and the adsorption process is dominated by chemisorption of ion exchange reaction,existing a single layer adsorption.

关 键 词：Sr^(2+) 吸附 电场辅助 磷酸锆 氧化石墨烯 解吸 

分 类 号：X505[环境科学与工程—环境工程]