4 years ago

Smart Photonic Crystal Hydrogel Material for Uranyl Ion Monitoring and Removal in Water

Smart Photonic Crystal Hydrogel Material for Uranyl Ion Monitoring and Removal in Water
Shuzhen Liao, Yongfang Sun, Wenfang Du, Ruqin Yu, Yan Wu, Fubing Xiao, Zhaoyang Wu, Wenhui Shi
Uranyl ion (UO22+) pollution is a serious environmental problem, and developing novel adsorption materials is essential for UO22+ monitoring and removal. Although some progress is achieved, it is still a challenging task to develop an adsorption material with indicating signal for real-time evaluation of the adsorption degree and the UO22+ concentration. Herein, this paper describes a smart photonic crystal hydrogel (PCH) material, which not only can be used for real-time monitoring function but also can be utilized for UO22+ removal based on the chelation of UO22+ with ligand groups in PCH material. The working principle is based on the binding of a uranyl ion to multiple ligand groups, which results in the shrinkage of PCH material and triggers a blue-shift of diffraction wavelength. Consequently, the adsorption degree and the UO22+ concentration can be sensitively evaluated by measuring the diffraction shift or observing the color change with naked eye. With this PCH material, the lowest detectable concentration for UO22+ is 10 × 10−9m, and the maximum adsorption capacity at 298 K is 169.67 mmol kg−1. In addition, this material also holds good selectivity and regeneration feature, and shows desirable performance for UO22+ analysis in real water samples. A smart photonic crystal hydrogel material is successfully developed for simultaneous monitoring and removal of uranyl ion via combining the indicating function of photonic crystal with the adsorption capability of hydrogel. This material provides a sensitive indicating signal to estimate the adsorption degree or the UO22+ concentration and shows high removal efficiency.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/adfm.201702147

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