4.4 Article

EDTA Modified Hollow Microporous Organic Nanospheres for Enhancing Adsorption of Metal Ions

Journal

CHEMISTRYSELECT
Volume 7, Issue 9, Pages -

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/slct.202104558

Keywords

Metal ions adsorption; EDTA modified; Hyper-crosslinking self-assembly strategy; Hollow microporous organic nanospheres

Funding

  1. National Natural Science Foundation of China [21574042]
  2. Fundamental Research Funds for the Central Universities [40500-20104-222047]

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In this study, EDTA modified hollow microporous organic nanospheres were prepared and exhibited excellent adsorption capacity and high stability for heavy-metal ions.
In this study, ethylenediaminetetraacetic acid (EDTA) modified hollow microporous organic nanospheres (EDTA-HMONs-BA) were prepared by a combination of one-pot hyper-crosslinking mediated self-assembly using polylactide-b-polystyrene (PLA-b-PS) diblock copolymer and benzylamine (BA) monomers as precursors and subsequent post-modification with EDTA. The obtained EDTA-HMONs-BA were characterized by FT-IR, TEM, TGA, solid state C-13 NMR, N-2 adsorption-desorption test et al. It revealed that the EDTA-HMONs-BA have a high specific surface area (226.86 m(2) g(-1)), which exhibited excellent adsorption ability for Cu2+ ions (236 mg g(-1)) with adsorption characteristics of pseudo-second-order model and Langmuir isotherm equation. Moreover, the obtained adsorbent is of high stability after five consecutive cycles. Besides, EDTA-HMONs-BA also showed good adsorption capacities for hard acid metal ions (Cr3+), soft acid metal ions (Ag+, Cd2+), borderline acid metal ions (Cu2+, Ni2+, Zn2+). The above results indicated that the EDTA-HMONs-BA can be considered as potential adsorbents for the removal of heavy-metal ions owing to the easily accessible adsorption sites and sufficiently good stability.

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