Capacitive deionization of a RO brackish water by AC/graphene composite electrodes

被引:23
作者
Chong, L-G. [1 ]
Chen, P-A. [1 ]
Huang, J-Y. [1 ]
Huang, H-L. [2 ]
Wang, H. Paul [1 ]
机构
[1] Natl Cheng Kung Univ, Dept Environm Engn, Tainan 701, Taiwan
[2] Natl United Univ, Dept Safety Hlth & Environm Engn, Miaoli 36003, Taiwan
关键词
Capacitive deionization; Activated carbon; Graphene; Palm-shell; RO brackish; REDUCED GRAPHENE OXIDE; RAMAN-SPECTROSCOPY; CARBON NANOTUBES; DRINKING-WATER; DESALINATION; NACL;
D O I
10.1016/j.chemosphere.2017.10.064
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
A feasibility study for water recycling and reuse of a reverse osmosis (RO) brackish wastewater by capacitive deionization (CDI) was carried out in the present work. Palm-shell wastes enriched in carbon was recycled to yield valuable activated carbon (AC) that has advantages of high surface area, high specific capacitance, and low electrical resistance as the CDI electrodes. The GAC prepared by dispersion of AC in the graphene (rGO) layers has a high surface area and electrical conductivity for CDI. The GAC electrodes have increasing electrosorption efficiencies from 1.6 to 3.0% during the repeated electrosorption-regeneration cycles under +1.2 -> 0 -> +1.2 V while the efficiencies the AC electrodes decrease from 2.7 to 1.6%. It is clear that the GAC-based electrodes have a better electrosorption efficiency and stability in, for example, the three repeated electrosoption-regeneration cycles for CDI of the wastewater. This work also exemplifies that the AC recycled from biomass such as palm-shell wastes can be used in CDI electrodes for recycling and reuse of wastewater. (C) 2017 Elsevier Ltd. All rights reserved.
引用
收藏
页码:296 / 301
页数:6
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