Abstract
A low-angle–dependent photonic crystal hydrogel (LAD-PCH) material was developed to simultaneously detect and remove uranyl ions (UO22+). Different from traditional SiO2 photonic crystal hydrogel with the problem of angle dependency, the LAD-PCH material overcomes the restriction of observation direction. The LAD-PCH is a composite material with the photonic crystal array of 180-nm monodisperse CdS@SiO2 particles embedded into the functional hydrogel. As one UO22+ can bind to multiple carboxyl groups and amide groups, the functional hydrogel fabricated by acrylic acid and acrylamide will shrink after chelating. These changes in the hydrogel volume alter the array spacing and trigger a blue shift of diffraction wavelength and naked-eye visual color changes of LAD-PCH. The color can vary from orange-red to orange, yellow, green, and cyan, corresponding to the determination range of 100 pM–100 μM. The LAD-PCH material detects UO22+ sensitively as the lowest detectable concentration is about 100 pM, and removes UO22+ high-efficiently as the maximum adsorption capacity of U(VI) is about 1010 mg g−1 at 298 K. This LAD-PCH material is convenient and has potential to simultaneously monitor and remove UO22+ from uranium-polluted water.
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This study was financially supported by the National Natural Science Foundation of China (21874037 and 21675045) and the International Scientific and Technological Cooperation Projects of China (2012DFR40480).
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Shi, W., Cheng, M., Chen, Q. et al. Low-angle–dependent CdS@SiO2 photonic crystal hydrogel material for visual detection and removal of uranyl ions. Microchim Acta 187, 476 (2020). https://doi.org/10.1007/s00604-020-04456-8
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DOI: https://doi.org/10.1007/s00604-020-04456-8