Enhancing the water desalination and electricity generation of a microbial desalination cell with a three-dimensional macroporous carbon nanotube-chitosan sponge anode
Enhancing the water desalination and electricity generation of a microbial desalination cell with a three-dimensional macroporous carbon nanotube-chitosan sponge anode
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DOI：
10.1016/j.scitotenv.2019.04.174
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发表时间：
2019-07-20
影响因子：
9.8
通讯作者：
Hou, Chia-Hung
中科院分区：
文献类型：
--
作者：
Ma, Chih-Yu;Hou, Chia-Hung
微生物海水淡化电池(MDCs)是目前正在研究的同时用于海水淡化、发电和废水处理的一种很有前途的生物电化学系统。负极材料在决定金属间化合物的性能中起着重要作用。在本研究中，将相容导电的碳纳米管-壳聚糖(CNT-CS)涂覆在三维(3D)大孔海绵上，作为MDCs的复合电极。实验结果表明，柔性碳纳米管海绵具有较高的比容量(在20 mV S电压下为159.4 F/g)、良好的循环稳定性(1000次循环伏安循环后的比容保持率为96%)和较低的电阻。在相同条件下，碳纳米管-CS海绵阳极电极的功率密度为1776.6 mW/m(2)(单位电极面积)，脱盐速率为16.5mgh(-1)，明显高于商品碳毡电极。MDC性能的改善可以归因于海绵阳极连续的3D大孔结构促进了电极表面的细菌负载能力。此外，碳纳米管的存在还进一步增强了细胞外的电子传递。研究结果表明，以三维碳纳米管-海绵阳极为载体的MDC为制备广泛适用于生物电化学系统的高性能MDC提供了一种有效的方法。(C)2019爱思唯尔B.V.保留所有权利。
Microbial desalination cells (MDCs) are promising bioelectrochemical systems that are being investigated for simultaneous seawater desalination, electricity generation, and wastewater treatment. Anode materials play an important role in determining the performance of MDCs. In this study, a three-dimensional (3D) macroporous sponge was coated with compatible and conductive carbon nanotube-chitosan (CNT-CS) as a composite electrode for MDCs. Experimental results showed that the flexible CNT-CS sponge exhibited a high capacitance (159.4 F/g at 20 mV s(-1)), good cycling stability (96% specific capacitance retention after 1000 cyclic voltammetry cycles) and low resistance. Moreover, the MDC with a CNT-CS sponge anode generated a high power density of 1776.6 mW/m(2) (per electrode area) and desalination rate of 16.5 mg h(-1), which are significantly higher than those of commercial carbon felt electrodes under the same conditions. The improved MDC performance can be attributed to the continuous 3D macroporous structure of the sponge anode promoting the bacterial loading capacity on the electrode surface. Moreover, the presence of CNTs also further enhances extracellular electron transfer. Our results demonstrate that an MDC operating with a 3D CNT-CS sponge anode offers an effective means for manufacturing high-performance MDCs with wide applicability to bioelectrochemical systems. (C) 2019 Elsevier B.V. All rights reserved.