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1. (WO2018038683) CO2-ENABLED REGENERATION AND REUSE OF RESPONSIVE ADSORBENTS

Pub. No.:    WO/2018/038683    International Application No.:    PCT/SG2017/050418
Publication Date: Fri Mar 02 00:59:59 CET 2018 International Filing Date: Sat Aug 26 01:59:59 CEST 2017
IPC: C02F 1/68
B01J 20/34
B01J 49/00
Applicants: NANYANG TECHNOLOGICAL UNIVERSITY
Inventors: HU, Xiao
BAI, Yu
LIANG, Yen Nan
Title: CO2-ENABLED REGENERATION AND REUSE OF RESPONSIVE ADSORBENTS
Abstract:
This invention relates to a switchable adsorption and desorption process triggered by carbon dioxide (CO2) to remove contaminants such as heavy metal ions using CO2-responsive adsorbent materials for water purification. The method comprising the steps of: (a) contacting a wastewater that comprises at least one contaminant with a polymeric adsorbent material, which comprises CO2-responsive functional groups that are in a form capable of complexing the at least one contaminant; (b) separating the adsorbent-contaminant complexes from the wastewater; (c) bubbling CO2 into the concentrated aqueous solutions of such complexes to regenerate the polymeric adsorbent material by releasing the contaminant from the polymeric adsorbent material, wherein the CO2-responsive functional groups are in a CO2-replete form; (d) separating the released contaminants from the polymeric adsorbent material. The pKb of the polymeric adsorbent material is from 7.5 to 9.0. The CO2-responsive polymeric adsorbent materials disclosed herein can be complexed, released and be regenerated without the need for heat or acid to be introduced into the decomplexation or regeneration steps.