Enhanced electrosorption selectivity of phosphate using an anion-exchange resin-coated activated carbon electrode

被引:21
作者
Shen, Yu-Yi [1 ]
Hsu, Chung-Chun [1 ]
Tsai, Shao-Wei [1 ]
Hou, Chia-Hung [1 ,2 ]
机构
[1] Natl Taiwan Univ, Grad Inst Environm Engn, 1,Sec 4 Roosevelt Rd, Taipei 10617, Taiwan
[2] Natl Taiwan Univ, Water Innovat Low Carbon & Environm Sustainabil R, Taipei 10617, Taiwan
关键词
Phosphate; Capacitive deionization; Anion-exchange resin; Selectivity; MEMBRANE CAPACITIVE DEIONIZATION; BIOLOGICAL PHOSPHORUS REMOVAL; WASTE-WATER; RECOVERY; IONS; DESALINATION; PERFORMANCE; FRAMEWORK; SYSTEMS; OXIDE;
D O I
10.1016/j.jcis.2021.04.129
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Regenerable methods for phosphate (P) recycling have received intense attention due to their potential environmental and economic benefits. In this study, to improve the electrosorptive removal of P in mem-brane capacitive deionization, an activated carbon (AC) electrode was coated with a heterogeneous anion-exchange resin layer, and named the AE-AC composite electrode. It was shown that the AE-AC elec-trode exhibited a good capacitive behavior for electrical double-layer charging. The batch-mode experi-ments indicted that when the solution pH changed from 5 to 8, the predominant P species shifted from monovalent H2PO4- to divalent HPO42- that was preferentially electroadsorbed for competitive elec-trosorption with Cl-. Importantly, the AE-AC composite electrode significantly increased the selectivity coefficient of P over Cl- to 0.56 that was 2.24-fold greater than that of the uncoated AC electrode, at 1.2 V in single-pass mode operation. This improvement can be ascribed to the preferential transport of P through the thin coating layer containing quaternary amine functional groups. The permselectivity of the coating also significantly increased the electrosorption capacity of P from 0.031 to 0.101 mmol/g with a high charge efficiency (97%) by the reduction in the co-ion repulsion effect. When the reverse volt-age (-1.2 V) was applied, electroadsorbed P was reversibly desorbed from the AE-AC electrode in repeated operation. This work suggests that coating an anion-exchange resin layer on the surface of a car-bon electrode shows great potential to improve the selective removal of P through electrosorption. (C) 2021 Elsevier Inc. All rights reserved.
引用
收藏
页码:199 / 208
页数:10
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