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| Adsorption of pentavalent vanadium by humic acid in water |
| Received:November 19, 2015 |
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| KeyWord:humic acid;vanadium;adsorption;influencing factors |
| Author Name | Affiliation | E-mail | | LIU Meng | College of Geography and Resources Science, Sichuan Normal University, Chengdu 610101, China
College of Architecture and Environment, Sichuan University, Chengdu 610065, China | | | WANG Hua-jing | College of Geography and Resources Science, Sichuan Normal University, Chengdu 610101, China | | | WANG Kun-peng | College of Architecture and Environment, Sichuan University, Chengdu 610065, China | | | YANG Jin-yan | College of Architecture and Environment, Sichuan University, Chengdu 610065, China | yanyang@scu.edu.cn |
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| Abstract: |
| Vanadium(V) is released naturally and anthropogenically to the environment and becomes an important pollutant. This study is conducted to examine adsorption characteristics of pentavalent V[V(Ⅴ)] as NaVO3 in water by humic acid under a series of initial V concentrations, humic acid concentrations, adsorption time, solution pH, temperature, ionic strength, and electrolyte type and concentrations. Results showed that: (1) at 90.91 mg·L-1 V(Ⅴ), the highest adsorption capacity of V was found at 1.09 g·L-1 of humic acid concentration; (2) with increases of V(Ⅴ) initial concentrations in solution, the adsorption rate gradually decreased, whereas the adsorption amount increased and reached the maximum at 1 818.18 mg·L-1 at 1.09 g·L-1 of humic acid concentration. Adsorption isotherm of V by humic acid could be well described by Langmuir model; (3)increasing solution pH and temperature gradually reduced the adsorption amount of V by humic acid, indicating that low temperature and low pH favored V adsorption by humic acid; (4) increasing electrolyte concentrations suppressed the adsorption of V by humic acid; (5)infrared spectrum and scanning electron microscopy showed that V complex was formed on the surface and the inside of humic acid and that the stretching vibration of O-H or N-H, C-O and C-H might also played role in V adsorption. Therefore, appropriate amount of humic acid could be used to remove V in water under certain environmental conditions. |
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