A new chelating resin （CPS-DMA-SABA） was synthesized with the chloromethylated crossqinked polystyrene porous beads （CPS） as raw materials, which were bonded with salicylidene-o-aminobenzoic acid （SABA） on the surface via a quaternary ammonium unit as a linker. The results showed that CPS-DMA-SABA would easily change into a zwitterionic chelating resin （CPS-DMA-SABZ） when washed with distilled water. CPS-DMA-SABA was characterized by elemental analysis, infrared spectra and thermo-gravimetric analysis. The ion sorption capacities of CPS-DMA-SABA were found to be 1916 μg/g for Zn2＋ withpH at 4.5, 1620μg/g for Cu2＋ with pH at 6.2, 1291 μg/g for Ni2＋ withpH at 6.6 and 780 μg/g for Cr3＋ withpH at 5.5, respectively. The experiments showed CPS-DMA-SABA also changed its color when meeting with the metal ion in the aqueous solution. As a consequence, CPS-DMA-SABA can not only be used as a solid phase extractant but also an indicator for confirming the heavy metal ion in solutions.
张田林Hui-min MaJia-jia WangCai-yan ZhuBing-bing Wang
Highly uniform Ce（OH）CO3 flowers were successfully prepared in large quantities using a facile hydrothermal approach from the reaction of Ce（NH4）（NO3）4 with CO（NH2）2 at 160℃ in a water-N2H4 complex. The influences of the N2H4 content and temperature on flower formation were discussed. CeO2 flowers were prepared by thermal conversion of Ce（OH）CO3 flowers at 500 ℃ in air. Both Ce（OH）CO3 and CeO2 flowers were characterized by X-ray powder diffraction （XRD）, and scanning electron microscopy （SEM）. The UV-vis adsorption spectrum of the CeO2 flowers showed that the band gap energy （Eg） is 2.66 eV, which is lower than that of bulk ceria.
