Autor: |
Shashi B. Atla, Jyoti Prakash Maity, Wei Pan, Hung-Tsan Liu, Min-Jen Tseng, Wun Rong Li, Chien-Yen Chen, A. Satyanarayana Reddy, Chien-Cheng Chen, Hau-Ren Chen |
Jazyk: |
angličtina |
Rok vydání: |
2011 |
Předmět: |
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Zdroj: |
International Journal of Molecular Sciences, Vol 12, Iss 11, Pp 8245-8258 (2011) |
Druh dokumentu: |
article |
ISSN: |
1422-0067 |
DOI: |
10.3390/ijms12118245 |
Popis: |
The separation of mercury ions from artificially contaminated water by the foam fractionation process using a biosurfactant (surfactin) and chemical surfactants (SDS and Tween-80) was investigated in this study. Parameters such as surfactant and mercury concentration, pH, foam volume, and digestion time were varied and their effects on the efficiency of mercury removal were investigated. The recovery efficiency of mercury ions was highly sensitive to the concentration of the surfactant. The highest mercury ion recovery by surfactin was obtained using a surfactin concentration of 10 × CMC, while recovery using SDS required < 10 × CMC and Tween-80 >10 × CMC. However, the enrichment of mercury ions in the foam was superior with surfactin, the mercury enrichment value corresponding to the highest metal recovery (10.4%) by surfactin being 1.53. Dilute solutions (2-mg L−1 Hg2+) resulted in better separation (36.4%), while concentrated solutions (100 mg L−1) enabled only a 2.3% recovery using surfactin. An increase in the digestion time of the metal solution with surfactin yielded better separation as compared with a freshly-prepared solution, and an increase in the airflow rate increased bubble production, resulting in higher metal recovery but low enrichment. Basic solutions yielded higher mercury separation as compared with acidic solutions due to the precipitation of surfactin under acidic conditions. |
Databáze: |
Directory of Open Access Journals |
Externí odkaz: |
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