Optimization of As(V) Removal from Contaminated Water with Mesoporous Alumina: Effects of pH, Contact Time, Concentration and Temperature
Publication: Journal of Environmental Engineering
Volume 143, Issue 9
Abstract
Mesoporous alumina (MA), synthesized at room temperature, is a high-performance adsorbent for removing arsenic [As(V)]. After adsorption for 1 h, the residual As(V) concentration in solution was found to be less than for an initial As(V) concentration of less than . A marked increase in arsenic removal was observed for an increase in the dosage of MA from 0.05 to 0.15 g. However, a relatively smaller increase in As(V) removal was observed when the dosage of MA was increased from 0.15 to 0.30 g. Spent MA can effectively be regenerated with 0.05 M NaOH. Even after five adsorption-desorption cycles, MA retained most of its adsorption capability and was able to remove more than 82% of the initial arsenic. The adsorption capability of MA for arsenic species was found to be in the order of: , which were removed by MA via hydrogen bond, electrostatic interactions, and ion exchange. It was found that the interactive effect of pH and initial concentration on As(V) removal percentage is of significance, while the interactive effect of adsorption temperature and adsorption time on As(V) removal is insignificant. The predicted maximum removal percentage of As(V) is 100%, and the corresponding optimized adsorption parameters were found to be as follows: adsorption time: 449 min; adsorption temperature: 45°C; initial pH: 3.97; initial concentration: . The results showed that the adsorption equilibrium data were adequately represented by Langmuir model, and the maximum adsorption capacity was .
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Acknowledgments
This research work was supported by Natural Science Foundation of China under Grant (No. 51068010, 21003066, 21267011, 21307046, and U1402233), China Postdoctoral Science Foundation Funded Project under Grant No. 20100471686, Young Academic and Technical Leader Raising Foundation of Yunnan Province under Grant No. 2008py010, and Natural Science Foundation of Yunnan Province (No. 2015FB120).
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©2017 American Society of Civil Engineers.
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Received: Feb 1, 2016
Accepted: Dec 28, 2016
Published online: Apr 17, 2017
Published in print: Sep 1, 2017
Discussion open until: Sep 17, 2017
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