Electrochemically-mediated selective capture of heavy metal chromium and arsenic oxyanions from water
Author(s)Su, Xiao; Kushima, Akihiro; Halliday, Cameron George; Zhou, Jian; Li, Ju; Hatton, Trevor Alan; ... Show more Show less
MetadataShow full item record
The removal of highly toxic, ultra-dilute contaminants of concern has been a primary challenge for clean water technologies. Chromium and arsenic are among the most prevalent heavy metal pollutants in urban and agricultural waters, with current separation processes having severe limitations due to lack of molecular selectivity. Here, we report redox-active metallopolymer electrodes for the selective electrochemical removal of chromium and arsenic. An uptake greater than 100 mg Cr/g adsorbent can be achieved electrochemically, with a 99% reversible working capacity, with the bound chromium ions released in the less harmful trivalent form. Furthermore, we study the metallopolymer response during electrochemical modulation by in situ transmission electron microscopy. The underlying mechanisms for molecular selectivity are investigated through electronic structure calculations, indicating a strong charge transfer to the heavy metal oxyanions. Finally, chromium and arsenic are remediated efficiently at concentrations as low as 100 ppb, in the presence of over 200-fold excess competing salts.
DepartmentMassachusetts Institute of Technology. Department of Chemical Engineering; Massachusetts Institute of Technology. Department of Materials Science and Engineering; Massachusetts Institute of Technology. Department of Nuclear Science and Engineering; Massachusetts Institute of Technology. Research Laboratory of Electronics
Nature Publishing Group
Su, Xiao, Akihiro Kushima, Cameron Halliday, Jian Zhou, Ju Li, and T. Alan Hatton. “Electrochemically-Mediated Selective Capture of Heavy Metal Chromium and Arsenic Oxyanions from Water.” Nature Communications 9, no. 1 (November 8, 2018).
Final published version