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The MOF + Technique: A Significant Synergic Effect Enables High Performance Chromate Removal
Author(s) -
Luo Ming Biao,
Xiong Yang Yang,
Wu Hui Qiong,
Feng Xue Feng,
Li Jian Qiang,
Luo Feng
Publication year - 2017
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201709197
Subject(s) - chromate conversion coating , adsorption , x ray photoelectron spectroscopy , scanning electron microscope , transmission electron microscopy , aqueous solution , metal organic framework , chemistry , inorganic chemistry , ion exchange , chemical engineering , nuclear chemistry , materials science , ion , nanotechnology , chromium , organic chemistry , engineering , composite material
A significant synergic effect between a metal–organic framework (MOF) and Fe 2 SO 4 , the so‐called MOF + technique, is exploited for the first time to remove toxic chromate from aqueous solutions. The results show that relative to the pristine MOF samples (no detectable chromate removal), the MOF + method enables super performance, giving a 796 Cr mg g −1 adsorption capacity. The value is almost eight‐fold higher than the best value of established MOF adsorbents, and the highest value of all reported porous adsorbents for such use. The adsorption mechanism, unlike the anion‐exchange process that dominates chromate removal in all other MOF adsorbents, as unveiled by X‐ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and transmission electron microscopy (TEM), is due to the surface formation of Fe 0.75 Cr 0.25 (OH) 3 nanospheres on the MOF samples.