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Engineered Removal of Trace NH 3 by Porous Organic Polymers Modified via Sequential Post‐Sulfonation and Post‐Alkylation
Author(s) -
Kang Dong Won,
Kang Minjung,
Kim Dae Won,
Kim Hyojin,
Lee Yong Hoon,
Yun Hongryeol,
Choe Jong Hyeak,
Hong Chang Seop
Publication year - 2021
Publication title -
advanced sustainable systems
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.499
H-Index - 24
ISSN - 2366-7486
DOI - 10.1002/adsu.202000161
Subject(s) - adsorption , desorption , polymer , alkylation , alkyl , porosity , chemical engineering , materials science , chemistry , organic chemistry , catalysis , engineering
Although NH 3 is damaging to human health and the environment, a smart synthetic route toward adsorbents with controllable adsorption and desorption properties at ultralow concentrations remains unexplored. Herein, double postsynthetically modified porous organic polymers, obtained via post‐sulfonation and post‐alkylation, are reported. The sulfonated adsorbent, 1S , exhibits a record‐high NH 3 capacity (4.03 mmol g −1 ) at ≈500 ppm. Notably, the polymer can capture NH 3 even at a ppb concentration level. Hydrophobization of the sulfonated materials with alkyl chains affords cost‐effective and scalable adsorbents ( 1SC x and 1ESC x ), which possess a high contact angle (≈120°) with water, thus resulting in rapid desorption kinetics and exceptional recyclability under dry and humid conditions at room temperature. This is the first demonstration of this design strategy for the control of the desorption of NH 3 among porous adsorbents.