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首页> 外文期刊>Journal of Materials Chemistry, A. Materials for energy and sustainability >Separation and recovery of heavy metal ions and salt ions from wastewater by 3D graphene-based asymmetric electrodes via capacitive deionization
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Separation and recovery of heavy metal ions and salt ions from wastewater by 3D graphene-based asymmetric electrodes via capacitive deionization

机译：基于3D石墨烯基的不对称电极通过电容去离子通过废水分离和回收重金属离子和盐离子

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Herein, a novel concept for the separation and recovery of heavy metal ions and salt ions from wastewater by 3D graphene-based asymmetric electrodes via capacitive deionization is presented for the first time. Instead of the traditional practice to adsorb heavy metals via the stirring method, we rationally design functional 3D graphene by grafting ethylenediamine triacetic acid (EDTA) and 3-aminopropyltriethoxysilane on the 3D graphene surface, and take advantage of capacitive deionization for wastewater treatment. In this process, Pb2+ is adsorbed by EDTA through chelation reaction and Na+ is adsorbed into the 3D graphene pores by electrosorption. Meanwhile, 3D graphene aminated with 3-aminopropyltriethoxysilane is used as an anode to minimize the co-ion effects and improve the removal efficiency. This research investigates the adsorption and desorption behaviors of Pb2+ and Na+ and the influence of operation conditions, such as pH, voltage, concentration and time on Pb2+ and Na+ removal. The removal efficiency is 99.9% at pH 6.0 for Pb2+ and 98.7% for Na+. It is worth noting that Pb2+ and Na+ can be separated and recovered in the desorption process in two steps due to the different adsorption mechanisms of Pb2+ and Na+. The desorption rates are similar to 99.6% for Pb2+ and similar to 97.2% for Na+, which remain at similar to 94.3% and similar to 88.2%, respectively, without further degradation after 8 cycles. Overall, CDI with 3D graphene-based asymmetric electrodes is a promising route for the separation and recovery of heavymetals and salt ions from wastewater.
机译：在此，首次介绍了通过电容去离子通过基于3D石墨烯基的不对称电极从废水中分离和回收重金属离子和盐离子的新概念。通过搅拌方法而不是传统的方法吸附重金属，我们通过将乙二胺三醋酸（EDTA）和3-氨基丙基三乙氧基硅烷在3D石墨烯表面上进行合理设计功能3D石墨烯，并利用电容去离子进行废水处理。在该方法中，PB2 +通过EDTA通过螯合反应吸附，Na +通过电放度吸附到3D石墨烯孔中。同时，用3-氨基丙基三乙氧基硅烷胺化的3D石墨烯用作阳极，以最小化共离子效应并提高去除效率。本研究研究了PB2 +和Na +的吸附和解吸行为以及操作条件的影响，例如PB2 +和Na +上的pH，电压，浓度和时间。 PH6.0的去除效率为pB2 +和Na +的98.7％。值得注意的是，由于PB2 +和Na +的不同吸附机制，可以在解吸过程中分离和回收PB2 +和Na +。解吸速率与PB2 +的99.6％相似，类似于NA +的97.2％，其仍然与94.3％相似，分别类似于88.2％，而8次循环后不再降解。总的来说，具有3D石墨烯的非对称电极的CDI是远离废水的重留和盐离子的分离和恢复的有希望的路线。

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