Bromide and iodide selectivity in membrane capacitive deionisation, and its potential application to reduce the formation of disinfection by-products in water treatment
| Autor: | Sherub Phuntsho, Jong-Moon Choi, Jiaxi Jiang, Pema Dorji, Seungkwan Hong, Ho Kyong Shon, David Inhyuk Kim |
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| Rok vydání: | 2019 |
| Předmět: |
Bromides
Environmental Engineering Health Toxicology and Mutagenesis Sodium 0208 environmental biotechnology Inorganic chemistry Iodide chemistry.chemical_element 02 engineering and technology 010501 environmental sciences Electrochemistry 01 natural sciences Water Purification chemistry.chemical_compound Adsorption Bromide Meteorology & Atmospheric Sciences Environmental Chemistry 0105 earth and related environmental sciences chemistry.chemical_classification Public Health Environmental and Occupational Health General Medicine General Chemistry Iodides Pollution 020801 environmental engineering Disinfection Membrane chemistry Water treatment Selectivity Environmental Sciences Water Pollutants Chemical |
| Zdroj: | Chemosphere. 234:536-544 |
| ISSN: | 0045-6535 |
| DOI: | 10.1016/j.chemosphere.2019.05.266 |
| Popis: | © 2019 Elsevier Ltd The formation of toxic disinfection by-products during water disinfection due to the presence of bromide and iodide is a major concern. Current treatment technologies such as membrane, adsorption and electrochemical processes have been known to have limitations such as high energy demand and excessive chemical use. In this study, the selectivity between bromide and iodide, and their removal in membrane capacitive deionisation (MCDI) was evaluated. The results showed that iodide was more selectively removed over bromide from several binary feed waters containing bromide and iodide under various initial concentrations and applied voltages. Even in the presence of significant background concentration of sodium chloride, definite selectivity of iodide over bromide was observed. The high partial-charge transfer coefficient of iodide compared to bromide could be a feasible explanation for high iodide selectivity since both bromide and iodide have similar ionic charge and hydrated radius. The result also shows that MCDI can be a potential alternative for the removal of bromide and iodide during water treatment. |
| Databáze: | OpenAIRE |
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