The effect of co-impregnated acids on the performance of Zn-based broad spectrum respirator carbons

Smith, J.W.H.; Romero, Jennifer V.; Dahn, Tara; Dunphy, K.; Croll, Lisa M.; Dahn, J. R.

doi:10.1016/j.jhazmat.2012.07.061

Cited by 14 publications

(8 citation statements)

References 23 publications

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“…These impregnants have included metal salts, acids, and amines. 13,14 The current state-of-the-art U.S. military filters use a carbon impregnated with copper, silver, zinc, molybdenum, and triethylenediamine (TEDA), known as ASZM-TEDA carbon.…”

Section: Current Toxic Chemical Protection Requirementsmentioning

confidence: 99%

“…Activated carbon has been modified with a variety of compounds, commonly known as impregnants, to react with higher-volatility (vapor pressure greater than 100 Torr) compounds. These impregnants have included metal salts, acids, and amines. , The current state-of-the-art U.S. military filters use a carbon impregnated with copper, silver, zinc, molybdenum, and triethylenediamine (TEDA), known as ASZM-TEDA carbon.…”

Section: Introductionmentioning

confidence: 99%

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Metal–Organic Frameworks for Air Purification of Toxic Chemicals

2014

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Section: Current Toxic Chemical Protection Requirementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Metal–Organic Frameworks for Air Purification of Toxic Chemicals

2014

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“…The development of more efficient materials for protection toward CWAs is a growing research area and has attracted a great deal of interest from the scientific community in the past few years . Current state-of-the-art protective materials consist of activated carbon supplemented with metal nanoparticles and/or organic amines, however, they suffer from deactivation problems. Other alternative approaches consisting of catalytically active metal oxides have also been explored, however, they are limited in terms of low adsorption capacity and/or low range of activity. , There is consequently a need for a new generation of advanced self-detoxifying materials capable of adsorbing and degrading a broad range of toxic agents in actual application conditions (i.e., ambient temperature and humidity).…”

Section: Introductionmentioning

confidence: 99%

Chemical Warfare Agents Detoxification Properties of Zirconium Metal–Organic Frameworks by Synergistic Incorporation of Nucleophilic and Basic Sites

Gil-San-Millán

López‐Maya

Hall³

et al. 2017

ACS Appl. Mater. Interfaces

114

117

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The development of protective self-detoxifying materials is an important societal challenge to counteract risk of attacks employing highly toxic chemical warfare agents (CWAs). In this work, we have developed bifunctional zirconium metal-organic frameworks (MOFs) incorporating variable amounts of nucleophilic amino residues by means of formation of the mixed ligand [ZrO(OH)(bdc)(bdc-NH)] (UiO-66-xNH) and [ZrO(OH)(bpdc)(bpdc-(NH))] (UiO-67-x(NH)) systems where bdc = benzene-1,4-dicarboxylate; bdc-NH= benzene-2-amino-1,4-dicarboxylate; bpdc = 4,4'-biphenyldicarboxylate; bpdc-(NH) = 2,2'-diamino-4,4'-biphenyldicarboxylate and x = 0, 0.25, 0.5, 0.75, 1. In a second step, the UiO-66-xNH and UiO-67-x(NH) systems have been postsynthetically modified by introduction of highly basic lithium tert-butoxide (LiOBu) on the oxohydroxometallic clusters of the mixed ligand MOFs to yield UiO-66-xNH@LiOBu and UiO-67-x(NH)@LiOBu materials. The results show that the combination of pre and postsynthetic modifications on these MOF series gives rise to fine-tuning of the catalytic activity toward the hydrolytic degradation of both simulants and real CWAs in unbuffered aqueous solutions. Indeed, UiO-66-0.25NH@LiOBu is able to hydrolyze both CWAs simulants (diisopropylfluorophosphate (DIFP), 2-chloroethylethylsulfide (CEES), and real CWAs (soman (GD), sulfur mustard (HD)) quickly in aqueous solution. These results are related to a suitable combination of robustness, nucleophilicity, basicity, and accessibility to the porous framework.

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“…7,8 The lethal toxicity of CWAs means research into decontamination methods often takes place with simulants rather than the real agents. 9,10 Porous materials such as activated carbons 9,11,12 and metal-organic frameworks (MOFs) [13][14][15][16][17][18] have been shown to be effective in the chemical decomposition of CWAs. MOFs tend to exhibit faster breakdown kinetics compared with activated carbons due to the tunability of their functionality and structure, and higher sorption capacities.…”

Section: Introductionmentioning

confidence: 99%

Swellable functional hypercrosslinked polymer networks for the uptake of chemical warfare agents

et al. 2017

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The need for porous materials to function as sorbents in order to allow for bulk uptake (and potential deactivation) of chemical warfare agent (CWA) stockpiles is of significant importance in the world today.Hypercrosslinked polymers (HCPs) represent a class of such sorbents being produced using the facile and tuneable so-called "knitting" procedure. Several HCPs are reported and their properties including apparent Brunauer-Emmett-Teller surface areas (SA BET ) and swellability (Q) against CWA simulants are examined using two reliable swelling methods which we have developed. The HCP derived from fluorobenzene showed the greatest potential for using such materials for CWA uptake and was tested against real agents including isopropyl methylphosphonofluoridate (sarin, GB) and bis(2-chloroethyl)sulfane (sulfur mustard, HD) revealing uptakes close to 20 mL g −1.

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The effect of co-impregnated acids on the performance of Zn-based broad spectrum respirator carbons

Cited by 14 publications

References 23 publications

Metal–Organic Frameworks for Air Purification of Toxic Chemicals

Metal–Organic Frameworks for Air Purification of Toxic Chemicals

Chemical Warfare Agents Detoxification Properties of Zirconium Metal–Organic Frameworks by Synergistic Incorporation of Nucleophilic and Basic Sites

Swellable functional hypercrosslinked polymer networks for the uptake of chemical warfare agents

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