节点文献

rGO、TiO₂修饰铁基磁性吸附材料除铊的性能

Removal of thallium by rGO and TiO₂ modified iron-based magnetic adsorbents

推荐 CAJ下载
PDF下载
不支持迅雷等下载工具，请取消加速工具后下载。

【Author】 LI Liangzhong;YU Lu;LIU Chang;MA Ruixue;YU Yang;LI Wei;YU Yunjiang;LIU Yongdi;State Environmental Protection Key Laboratory of Environmental Pollution Health Risk Assessment,South China Institute of Environmental Sciences,Ministry of Ecology and Environment;School of Resources and Environmental Engineering,East China University of Science and Technology;Beijing University of Technology;Inner Mongolia Autonomous Region Key Laboratory of Water Pollution Control,School of Ecology and Environment,Inner Mongolia University;School of Environment,Jinan University;

【通讯作者】刘勇弟;

【机构】生态环境部华南环境科学研究所国家环境保护环境污染健康风险评价重点实验室；华东理工大学资源与环境工程学院；北京工业大学；内蒙古大学生态与环境工程学院内蒙古水污染控制重点实验室；暨南大学环境学院；

【摘要】近年来，铊（Tl）污染事件时有发生，对饮用水源造成了严重威胁，含铊废水的高效处理刻不容缓。通过化学共沉淀法制备Fe₃O₄颗粒，结合水热反应、溶胶凝胶等改性方法，制备了磁性钛铁纳米颗粒（TFNPs）、四氧化三铁/二氧化钛核壳颗粒（Fe₃O₄@TiO₂）和还原氧化石墨烯负载四氧化三铁/二氧化钛（rGO-Fe₃O₄@TiO₂）复合磁性材料，考察磁性复合材料吸附、氧化去除Tl（Ⅰ）的性能，并阐明其作用机制。结果表明，TFNPs、Fe₃O₄@TiO₂和rGO-Fe₃O₄@TiO₂单位Ti含量条件下Tl（I）最大吸附容量分别为200、271.8和440 mg-Tl·g-Ti^-1。TFNPs/过硫酸盐（PS）、Fe₃O₄@TiO₂/PS和rGO-Fe₃O₄@TiO₂/PS耦合体系对Tl的去除率分别为51.7%、47.2%和88.4%，这表明rGO-Fe₃O₄@TiO₂/PS耦合体系能够高效的去除Tl。在Tl（Ⅰ）和PS混合溶液中，Fe₃O₄、rGO和rGO-Fe₃O₄@TiO₂的电子供给容量（EDC）分别为168.2、225.4和195.4μmol-e^-·g^-1，而电子接受容量（EAC）分别为131.4、746.8和571.3μmol-e^-·g^-1，表明rGO具有优异的电子转移能力。本研究结果可为含铊废水高效处理材料的开发提供参考。更多还原

【Abstract】 The thallium pollution leading to a serious threat to the safety of drinking water in downstream cities.Therefore,the efficient treatment of thallium containing wastewater is urgently needed.In this study,Fe₃O₄ particles were prepared by chemical coprecipitation method and the surface loading of TiO₂ nanoparticles was prepared by hydrothermal reaction and sol-gel method.Three different magnetic adsorbents including TFNPs,Fe₃O₄@TiO₂ and rGO-Fe₃O₄@TiO₂ composite were developed for the removal of thallium from water.The maximum adsorption capacities of Tl（Ⅰ） under unit Ti content on TFNPs,Fe₃O₄@TiO₂ and rGO-Fe₃O₄@TiO₂ magnetic composites were 200,271.8 and 440 mg-Tl·g-Ti^-1,respectively.Therefore,the rGO-Fe₃O₄@TiO₂ adsorbent achieved the efficient removal of Tl（Ⅰ） from water.The Tl removal rates of TFNPs/PS,Fe₃O₄@TiO₂/PS and rGO-Fe₃O₄@TiO₂/PS hybrid systems were respectively 51.7%,47.2%and 88.4%,indicating that rGO-Fe₃O₄@TiO₂/PS hybrid system could remove Tl quickly and efficiently.The electronic supply capacities （EDC） of Fe₃O₄,rGO and rGO-Fe₃O₄@TiO₂ were respectively 168.2,225.4 and 195.4μmole^-·g^-1,when they were added into Tl（Ⅰ） and PS mixed solution.The electron acceptance capacity （EAC） values were respectively,131.4,746.8 and 571.3μmol-e^-·g^-1,which indicated that rGO nanosheets have excellent electron transfer ability.The results of this study can provide a reference for the development of efficient thallium containing wastewater treatment materials.更多还原