摘要
纳米Fe_(3)O_(4)作为典型的磁性吸附材料可应用于放射性废水处理,为进一步提高其吸附性能,本文通过Zn和S双修饰Fe_(3)O_(4)制备出纳米磁性S-ZnFe_(2)O_(4),并通过SEM、XRD、EDS、FT-IR、Raman等手段对比表征了Fe_(3)O_(4)及S-ZnFe_(2)O_(4)的结构及形貌,研究了pH对其吸附铀酰离子(UO_(2)^(2+))效果的影响,并基于变量接触时间及初始浓度探索了其吸附动力学及热力学规律。结果表明:Zn和S的双修饰后,纳米材料对UO_(2)^(2+)的吸附量显著增加,从27.12 mg/g增加至51.68 mg/g;纳米Fe_(3)O_(4)和S-ZnFe_(2)O_(4)吸附UO_(2)^(2+)的最佳pH为6.0,吸附过程均符合伪二阶动力学模型;纳米Fe_(3)O_(4)的吸附过程同时符合Langmuir和Freundlich吸附模型,纳米S-ZnFe_(2)O_(4)的吸附过程符合Langmuir等温吸附模型。本研究对开发新型高效含铀废水处理用吸附材料具有重要指导意义。
Fe_(3)O_(4) as a typical nano-magnetic material was widely used in wastewater treatment.In this work,in order to further improve its adsorption performance,S-ZnFe_(2)O_(4) was prepared by double modification Zn and sulfur on Fe_(3)O_(4),the structures and morphologies of Fe_(3)O_(4) and S-ZnFe_(2)O_(4) were compared and characterized by SEM,XRD,EDS,FT-IR,Raman and other characterization methods.Adsorption experiments explored the influence of pH on the adsorption of uranyl ions.Its adsorption kinetics and thermodynamics were explored based on variable contact time and initial concentration.The results showed that after the double modification of Zn and S,the adsorption capacity for UO_(2)^(2+) increased significantly,from 27.12 mg/g to 51.68 mg/g.the optimal pH for the adsorption of UO_(2)^(2+) by nano-Fe_(3)O_(4) and S-ZnFe_(2)O_(4) was 6.0;the adsorption process fitted to the pseudo second-order kinetic model;the adsorption process of nano-Fe_(3)O_(4) fitted to both Langmuir isotherm adsorption model and Freundlich isotherm adsorption model,the adsorption process of nano-S-ZnFe_(2)O_(4) fitted to Langmuir isotherm adsorption model;This research is of great guiding significance to the development of new adsorbents that efficiently adsorb uranium-containing wastewater.
作者
刘孟清
霍婷婷
董发勤
边亮
王欢博
李宇
万秋月
蒋璐蔓
杜康婷
LIU Mengqing;HUO Tingting;DONG Faqin;BIAN Liang;WANG Huanbo;LI Yu;WAN Qiuyue;JIANG Luman;DU Kangting(School of Environment and Resource, Southwest University of Science and Technology,Mianyang 621010, China;Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education,Mianyang 621010, China)
出处
《功能材料》
CAS
CSCD
北大核心
2021年第6期6200-6207,共8页
Journal of Functional Materials
基金
国家重点基础研究发展计划(973计划)资助项目(2014CB846003)
国家自然科学基金资助项目(41872039)
西南科技大学博士基金资助项目(18zx7156)
西南科技大学龙山人才资助项目(18lzx651)
四川省教育厅2020年省级大学生创新创业训练计划资助项目(S202010619061)。
