MnO2 decorated porous carbon derived from Enteromorpha prolifera as flow-through electrode for dual-mode capacitive deionization

被引:39
作者
Liu, Yong [1 ]
Geng, Bo [1 ]
Zhang, Yuchen [1 ]
Gao, Xin [1 ]
Du, Xin [1 ]
Dou, Xinyue [1 ]
Zhu, Haiguang [1 ]
Yuan, Xun [1 ]
机构
[1] Qingdao Univ Sci & Technol, Sch Mat Sci & Engn, Qingdao 266042, Shandong, Peoples R China
基金
中国国家自然科学基金;
关键词
Capacitive deionization; Enteromorpha prolifera; MnO2; Dual-mode; Bio-waste; ACTIVATED CARBON; FARADAIC REACTIONS; DESALINATION PERFORMANCE; SEAWATER DESALINATION; WATER DESALINATION; NANOFIBER AEROGELS; ANODE; GRAPHENE; BRACKISH; ENERGY;
D O I
10.1016/j.desal.2021.114977
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
Owing to fresh-water shortage, developing highly efficient capacitive deionization (CDI) system equipped with low-cost electrodes is urgently required to process saline water to freshwater. On the other hand, Enteromorpha prolifera (EP for short, a typical bio-waste in global oceans) induced marine ecological crisis has become a serious threat to the global marine ecosystem. Aiming to kill two birds with one stone, we report the design of an EP-derived MnO2-decorated activated carbon composite (ep-AC@MnO2) as low-cost electrodes for high-performance dual-mode capacitive deionization. The as-fabricated ep-AC@MnO2 displays a high specific capacitance of 335.6 F g(-1) with dual-mode sodium storage behavior. Benefiting from this unique dual-mode capacitance feature, the ep-AC@MnO2-based dual-mode CDI system exhibits highly efficient desalination performance (desalination capacity/rate: 25.7 mg g(-1)/2 .95 mg g(-1) min(-1)) with excellent desalination recyclability (11.3% declination after 30 cycles). This work could be of broad interest since it not only exemplifies the simple fabrication of low-cost yet high-efficiency CDI electrode material with dual-mode capacitance for capacitive desalination, but also offers a sustainable strategy to turn marine biowaste into treasure for possible relieving of the EP-induced marine ecological crisis.
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页数:8
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