Preparation of Waterborne Polyurethane Foam with Active Carbon and Its Adsorption for Phenol in Aqueous Solution
Publication: Journal of Environmental Engineering
Volume 139, Issue 8
Abstract
Concerned about environmental pollution and health safety risks, waterborne polyurethane (WPU) was introduced in place of conventional binders in preparing an active carbon polyurethane foam, active carbon WPU foam (ACWPU foam), through two sequential steps. The scanning electron microscopy and wettability tests showed that the WPU-based process was effective for achieving a higher active carbon content, enhanced pores’ wall roughness, and improved hydrophilicity of the foam, which was explained by infrared spectroscopy. Adsorption behavior of the ACWPU foam for phenol in aqueous solutions was investigated by batch experiments. The results showed that the maximum removal capacity of phenol ( foam) with of sorbent was observed at at pH 7. Removals of more than 85% occurred in 2.5 h, and the loading half-time was calculated to be only 26.77 min. In addition, adsorption kinetic data were described by a pseudo-second-order equation and the equilibrium data fitted very well with the Langmuir and Temkin models. Further, the ACWPU foam could be fully recycled via 0.01 M NaOH. In general, WPU as an environmentally friendly binder had excellent application in preparing ACWPU foam. Meanwhile, this foam should be a promising adsorbent in the recovery of phenol.
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Acknowledgments
The authors gratefully acknowledge financial support from the National Major Specific Program of Science and Technology on Controlling and Administering of Water’s Pollution (2008ZX07212-001-04), Key Research Program of Gansu Province (2GS064-A52-036-02, GS022-A52-082).
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Published In
Journal of Environmental Engineering
Volume 139 • Issue 8 • August 2013
Pages: 1070 - 1079
Copyright
© 2013 American Society of Civil Engineers.
History
Received: May 8, 2012
Accepted: Mar 5, 2013
Published online: Mar 7, 2013
Published in print: Aug 1, 2013
Discussion open until: Aug 7, 2013
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