Journal
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Volume 462, Issue -, Pages 186-193Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.colsurfa.2014.09.012
Keywords
Magnetic ion imprinted CdTe quantum dots; EDTA-etching method; Cd(II); Selectivity
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Funding
- National Natural Science Foundation of China [51178213, 51238002, 51272099, 51308278]
- Program for New Century Excellent Talents in University [NCET-11-1004]
- Cultivating Program for Young Scientists of Jiangxi Province of China [20112BCB23016]
- Natural Science Foundation of Jiangxi Province [20122BAB213014]
- Department of Education Fund of Jiangxi Province [GJJ13506]
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A novel magnetic Cd(II)-imprinted fluorescent CdTe quantum dot (Fe3O4@CdTe-IIP) was synthesized through chemical etching strategy without the use of functional monomer and cross-linkers, and was used as an adsorbent for the removal of Cd(II) from water. Fe3O4@CdTe-IIP not only shows much higher adsorption capacity and selectivity for Cd(II) than the non-imprinted counterpart (Fe3O4@CdTe), but also exhibits good photoluminescence and magnetism. The adsorption capacities of Fe3O4@CdTe-IIP and Fe3O4@ CdTe for Cd(II) ions are 17.57 and 8.03 mg/g, respectively. The studies of adsorption kinetics show that the adsorption rate of Fe3O4@CdTe-IIP is fast, and the adsorption process fits well with a pseudo-second-order model. Moreover, the progress of the adsorption of Cd(II) ions on Fe3O4@CdTe-IIP can be monitored according to color change of Fe3O4@CdTe-IIP because of its fluorescent recovery. (C) 2014 Elsevier B.V. All rights reserved.
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