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2,6-二氨基蒽醌/石墨烯复合电极强化电吸附Pb2+
摘要点击 1549  全文点击 535  投稿时间:2019-02-25  修订日期:2019-03-20
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中文关键词  2,6-二氨基蒽醌  还原氧化石墨烯  复合电极  电吸附  铅离子(Pb2+)
英文关键词  2,6-diaminoanthraquinone  reduced graphene oxide  composite electrode  electrosorption  Pb2+
作者单位E-mail
晋圣珧 北京化工大学化学工程学院, 北京 100029
清华大学水质与水生态研究中心, 北京 100084
中国科学院生态环境研究中心, 北京 100085 
18811720595@163.com 
向阳 北京化工大学化学工程学院, 北京 100029  
张隽瑀 清华大学水质与水生态研究中心, 北京 100084  
张凯 中国科学院生态环境研究中心, 北京 100085  
吉庆华 清华大学水质与水生态研究中心, 北京 100084
中国科学院生态环境研究中心, 北京 100085 
qhji@tsinghua.edu.cn 
中文摘要
      电吸附高效去除水中重金属离子的关键在于开发性能优异的电极材料.采用2,6-二氨基蒽醌(DA)修饰还原氧化石墨烯(rGO),通过溶剂热法成功制备了DA@rGO复合电极,考察了复合电极的电化学性质及电吸附Pb2+性能.循环伏安测试表明,复合电极电化学性质优异,比电容在电流密度为1 A·g-1时达到304.4 F·g-1,DA修饰显著提高了复合电极的赝电容.电吸附Pb2+测试表明,施加电压为-1.2 V时电吸附效果最优,反应60 min后Pb2+去除率达94.8%.电吸附过程符合一级动力学方程,Langmuir模型拟合得到Pb2+的饱和吸附量为356.66 mg·g-1,明显高于rGO电极(319.40 mg·g-1),DA修饰引起的电容增加是复合电极Pb2+吸附量提高的重要原因.使用0.5 mol·L-1硝酸处理可使电极吸附的Pb2+在5 min内脱附完全,实现吸附剂再生.经过10次电极吸附-脱附循环后,DA@rGO复合电极对Pb2+的吸附去除率保持在88%左右,电极循环性能稳定.
英文摘要
      The key to efficient removal of heavy metal ions from water by electrosorption is to develop electrode materials with excellent performance. In this study, 2,6-diaminoanthraquinone (DA)-modified reduced graphene oxide (rGO) was used to prepare a DA@rGO composite electrode using the solvothermal method. The electrochemical properties, electrosorption of Pb2+, adsorption kinetics, and cycle regeneration performance of the composite electrode were investigated. Cyclic voltammetry showed that the composite electrode had excellent electrochemical properties, and the specific capacitance reached 304.4 F·g-1 at a current density of 1 A·g-1. The DA modification significantly increased the pseudocapacitance of the composite electrode. The electrosorption Pb2+ test showed that optimal electrosorption was achieved with -1.2 V of the applied voltage, and the removal rate of the Pb2+ reached 94.8% after 60 min. The electrosorption process is in accord with the first-order kinetic equation. The saturated adsorption capacity of Pb2+ obtained by the Langmuir model was 356.66 mg·g-1, which is significantly higher than that of rGO electrode, at 319.40 mg·g-1. The increase in Pb2+ adsorption amount of the composite electrode can be attributed to the increase in capacitance caused by DA modification. Treatment with 0.5 mol·L-1 nitric acid can desorb the Pb2+ within 5 min to achieve regeneration of the composite electrode. After 10 adsorption-desorption cycles, the adsorption removal rate of Pb2+ by the composite electrode was kept at 88%, indicating robust stability.

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