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HERO ID
5097896
Reference Type
Journal Article
Title
Highly Defective UiO-66 Materials for the Adsorptive Removal of Perfluorooctanesulfonate
Author(s)
Clark, CA; Heck, KN; Powell, CD; Wong, MS
Year
2019
Journal
ACS Sustainable Chemistry & Engineering
ISSN:
2168-0485
Publisher
AMER CHEMICAL SOC
Location
WASHINGTON
Volume
7
Issue
7
Page Numbers
6619-6628
Language
English
DOI
10.1021/acssuschemeng.8b05572
Web of Science Id
WOS:000463462100023
Abstract
Perfluorooctanesulfonate (PFOS) is a persistent organic pollutant that is bioaccumulative and toxic. While its use in most countries has been restricted to certain industrial applications due to environmental and health concerns, chrome plating and semiconductor manufacturing facilities are industrial point sources of PFOS-containing wastewater. Current remediation technologies are ineffective at treating these highly concentrated industrial effluents. In this work, UiO-66 metal organic frameworks (MOFs) of several defect concentrations were studied as sorbents for the removal of PFOS from concentrated aqueous solutions. PFOS sorption isotherms indicated that defective UiO-66, prepared with HCl as a modulator, had a maximum Langmuir sorption capacity of 1.24 mmol/g, which was similar to 2X greater than powdered activated carbon (PAC), but similar to 2X less than that of a commercial ion-exchange resin. Defective UiO-66 adsorbed PFOS 2 orders of magnitude faster than the ion-exchange resin. Large pore defects (similar to 16 and similar to 20 angstrom) within the framework were critical to the increased adsorption capacity due to higher internal surface area and an increased number of coordinatively unsaturated Zr sites to bind the PFOS head groups. Of the common co-contaminants in chrome plating wastewaters, chloride ions have a negligible effect on PFOS sorption, while sulfate and hexavalent chromium anions compete for cationically charged adsorption sites. These materials were also effective adsorbents for the shorter-chain homologue, perfluorobutanesulfonate (PFBS). The enhanced PFOS and PFBS adsorptive properties of UiO-66 highlight the advantage of structurally defective MOFs as a water treatment approach toward environmental sustainability.
Keywords
UiO-66; Metal-organic frameworks; Perfluoroalkyl substance; Perfluorooctanesulfonate; Perfluorobutanesulfonate; Adsorption; Defect
Tags
IRIS
•
Chromium VI
Considered
Excluded
Other Not Pertinent
Lit Search Updates
May 2018 - October 2019
PFAS
•
Additional PFAS (formerly XAgency)
•
PFAS 150
Literature Search Update December 2020
WOS
Literature Search August 2019
Web of Science
Not prioritized for screening
Perfluorinated compounds
Perfluorobutanesulfonate
Perfluorobutanesulfonic acid
Perfluorobutanesulfonyl fluoride
Perfluorooctanesulfonate
Perfluorooctanesulfonic acid
•
PFBS
Search
WOS
Lit Search Update: May 2019
WOS
Scopus: April 2021
•
PFOA (335-67-1) and PFOS (1763-23-1)
LitSearch: Feb 2019 - May 2020
WoS
Literature Search Update (Apr 2019 - Sep 2020)
WOS
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