Sorption behavior of heavy metals on poorly crystalline manganese oxides: roles of water conditions and light
SCIE
SCOPUS
- Title
- Sorption behavior of heavy metals on poorly crystalline manganese oxides: roles of water conditions and light
- Authors
- Kim, EJ; Kim, J; Choi, SC; Chang, YS
- Date Issued
- 2014-06
- Publisher
- ROYAL SOC CHEMISTRY
- Abstract
- The objective of this study was to determine the effects of solution properties and light on the metal uptake and release in a nanosized, poorly crystalline manganese oxide (delta-MnO2) system. The results from synthetic water matrices revealed that the aggregation state was strongly affected by ionic strength, Ca2+, and humic acid, and the particle aggregation subsequently changed the ability of delta-MnO2 to adsorb and sequester heavy metal ions (Cu(II)). The extent of Cu(II) uptake onto delta-MnO2 exhibited a negative correlation with the attachment efficiency value, which suggested that a lower sorption capacity could be achieved under aggregation-inducing conditions. Upon exposure to light, the adsorbed Cu(II) was released from the delta-MnO2 surface via photoinduced dissolution of MnO2. The concentration of Cu(II) desorbed was substantially higher when the humic acid was present together with Ca2+. The present investigation enables us to better understand the adsorption-desorption processes of heavy metals occurring at the MnO2-solution interface in response to common environmental stimuli.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/10166
- DOI
- 10.1039/C4EM00044G
- ISSN
- 2050-7887
- Article Type
- Article
- Citation
- ENVIRONMENTAL SCIENCE-PROCESSES & IMPACTS, vol. 16, no. 6, page. 1519 - 1525, 2014-06
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