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Enhanced Removal of Pb(II) from Aqueous Solution using EDTA‐Modified Magnetic Graphene Oxide
Author(s) -
Xing Cuijuan,
Xia Aiqing,
Yu Ling,
Dong Lili,
Hao Yongchao,
Qi Xingcun
Publication year - 2021
Publication title -
clean – soil, air, water
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 66
eISSN - 1863-0669
pISSN - 1863-0650
DOI - 10.1002/clen.202000272
Subject(s) - adsorption , silanization , ethylenediaminetetraacetic acid , aqueous solution , chemistry , chelation , oxide , graphene , inorganic chemistry , freundlich equation , nuclear chemistry , materials science , nanotechnology , organic chemistry
Abstract Ethylenediaminetetraacetic acid (EDTA) groups are successfully linked to magnetic graphene oxide (MGO) by a silanization reaction between N ‐(trimethoxysilylpropyl) ethylenediaminetriacetic acid and OH on the surface of MGO. The EDTA‐modification enhances the adsorption capacity of MGO because of the chelating ability of EDTA. The adsorption behavior of Pb(II) and the effects of solution conditions such as contact time, initial Pb(II) concentration, and pH (1–9) are investigated. The adsorption capacity for Pb(II) removal is found to be 211.3 mg g −1 and the adsorption process is completed at pH 6.8 within 50 min. The process is shown to follow a pseudo‐second‐order kinetic rate. The isothermal data reveal that the adsorption process of Pb(II) is well‐matched with the Freundlich model. In addition, the magnetic composite can be effectively and simply separated by an external magnetic field. Therefore, MGO‐EDTA can potentially serve as an adsorbent for the separation and removal of Pb(II) from water.