Capacitive deionization: a promising technology for water defluoridation: a review

被引:13
作者
Alfredy, Tusekile [1 ,2 ]
Elisadiki, Joyce [3 ]
Jande, Yusufu Abeid Chande [1 ,2 ]
机构
[1] Nelson Mandela African Inst Sci & Technol, Dept Mat & Energy Sci & Engn, POB 447, Arusha, Tanzania
[2] Nelson Mandela African Inst Sci & Technol, Water Infrastruct & Sustainable Energy Futures WI, Nelson Mandela Rd,POB 9124 Nelson Mandela, Arusha, Tanzania
[3] Univ Dodoma, Dept Phys, POB 338, Dodoma, Tanzania
关键词
capacitive deionization; defluoridation; electrode materials; electrosorption; ACTIVATED CARBON ELECTRODE; FLUORIDE REMOVAL; AQUEOUS-SOLUTION; ELECTROSORPTION SELECTIVITY; BRACKISH GROUNDWATERS; DESALINATION; PERFORMANCE; ADSORPTION; MEMBRANE; IONS;
D O I
10.2166/ws.2021.287
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Capacitive deionization (CDI) is among the promising technologies employed for water purification. CDI has been studied for the removal of various ionic species from water including fluoride ion (F-) with promising results. However, there is no comprehensive literature that summarizes the use of CDI for water defluoridation applications. Therefore, this review paper critically analyzes different electrode materials that have been studied for water defluoridation, their electrosorption capacities and F- removal efficiencies. It further discussed the parameters that influence CDI efficiency during defluoridation and point out the issues of F- selectivity when coexisting with other ions in the solution. We can conclude that different electrode materials have shown different abilities in electrosorption of F-. The carbon-based materials possess high surface area and good electrical conductivity which is paramount for ion adsorption but lack selectivity for F- removal. Metal oxides and hydroxides have been reported with improved electrosorption capacity and high selectivity to F- due to the ion exchange between the F- and the hydroxyls surface of the metal oxides/hydroxides. Apart from the good performance of these materials for defluoridation, the discovery of actual practicability use of the electrode materials for defluoridation for commercial scale is still a need.
引用
收藏
页码:110 / 125
页数:16
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