Journal
ENVIRONMENTAL SCIENCE & TECHNOLOGY
Volume 54, Issue 13, Pages 8411-8419Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.est.0c01518
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Funding
- National Natural Science Foundation of China [21906101, 21722704]
- Science and Technology Commission of Shanghai Municipality [19DZ2293100, 18DZ2281400]
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Capacitive deionization (CDI) is a promising water purification technology. However, the current ion adsorption capacity of CDI electrode materials is still an issue, which cannot meet the rapid demand of clean water from saline water. Herein, trace-Fe-enhanced removal of ions from saline water via CDI is presented. The ion adsorption capacity of CDI electrodes is up to 36.25 mg g(-1) in a 500 mg L-1 NaCl media at 1.2 V together with stable regeneration property. In situ Raman and ex situ XPS measurements unravel the removal mechanism of ions from saline water, and the reinforced adsorption of ions is due to the introduction of trace Fe boosting electron transfer of electro-adsorption sites during the CDI process. This work presents a promising solution to highly efficient capacitive deionization for saline water.
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