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Start Over Author "Xu, Yao" Journal water research
9 results on '"Xu, Yao"'

9. Alumina nanofibers grafted with functional groups: a new design in efficient sorbents for removal of toxic contaminants from water

Author

Dongjiang Yang, Blain Paul, Wujun Xu, Xuebin Ke, Huaiyong Zhu, Robert Wellard, Yao Xu, Cheng Guo, Erming Liu, Yong Yuan, Yuhan Sun, Yang, Dongjiang, Paul, Blain, Xu, Wujun, Yuan, Yong, Liu, Erming, Ke, Xuebin, Wellard, R.M, Guo, Cheng, Xu, Yao, Sun, Yuhan, and Zhu, Huaiyong

Subjects
Grafting functional groups, Environmental Engineering, Sorbent, Magnetic Resonance Spectroscopy, Nitrogen, Metal ions in aqueous solution, Nanofibers, Portable water purification, Water Purification, chemistry.chemical_compound, Adsorption, Phenols, X-Ray Diffraction, Metals, Heavy, Spectroscopy, Fourier Transform Infrared, Aluminum Oxide, Organic chemistry, Sulfhydryl Compounds, Waste Management and Disposal, Water Science and Technology, Civil and Structural Engineering, Calorimetry, Differential Scanning, Chemistry, Ecological Modeling, Sorption, Grafting, Pollution, Toluene, Chemical engineering, Heavy metal ions, Nanofiber, Thermogravimetry, Organic pollutants, g-Al2O3 Nanofibers, Hydrophobic and Hydrophilic Interactions, Water Pollutants, Chemical
Abstract

A new design in efficient sorbents for the removal of trace pollutants from water was proposed: grafting the external surface of gamma-alumina (gamma-Al(2)O(3)) nanofibers with functional groups that have a strong affinity to the contaminants. This new grafting strategy greatly improves the accessibility of these sorption sites to adsorbates and thus efficiency of the fibrous sorbents. The product sorbents could capture the pollutants selectively even when the concentration of the contaminants is extremely low. Two types of gamma-Al(2)O(3) nanofibers with different size were prepared via facile hydrothermal methods. Thiol groups were then grafted on the gamma-Al(2)O(3) fibers by refluxing the toluene solution of 3-mercaptopropyltrimethoxysilane (MPTMS). The thiol group modified fibers not only can efficiently remove heavy metal ions (Pb(2+) and Cd(2+)) from water at a high flux, but also display high sorption capacity under sorption equilibrium conditions. Similar result was obtained from the nanofibers grafted with octyl groups which are employed to selectively adsorb highly diluted hydrophobic 4-nonylphenol molecules from water. This study demonstrates that grafting nanofibers is a new and effective strategy for developing efficient sorbents.

Published
2009

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