Adsorption properties of advanced functional materials against gaseous formaldehyde

Kumar Vikrant, Minkyu Cho, Azmatullah Khan, Ki-Hyun Kim, Wha Seung Ahn, Eilhann E. Kwon

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Intense efforts have been made to eliminate toxic volatile organic compounds (VOCs) in indoor environments, especially formaldehyde (FA). In this study, the removal performances of gaseous FA using two metal-organic frameworks, MOF-5 and UiO-66-NH2, and two covalent-organic polymers, CBAP-1 (EDA) and CBAP-1 (DETA), along with activated carbon as a conventional reference material, were evaluated. To assess the removal capacity of FA under near-ambient conditions, a series of adsorption experiments were conducted at its concentrations/partial pressures of both low (0.1–0.5 ppm/0.01–0.05 Pa) and high ranges (5–25 ppm/0.5–2.5 Pa). Among all tested materials at the high-pressure region ㅐ (e.g., at 2.5 ppm FA), a maximum adsorption capacity of 69.7 mg g−1 was recorded by UiO-66-NH2. Moreover, UiO-66-NH2 also displayed the best 10% breakthrough volume (BTV10) of 534 L g−1 (0.5 ppm FA) to 2963 L g−1 (0.1 ppm FA). In contrast, at the high concentration test (at 5, 10, and 25 ppm FA), the maximum BTV10 values were observed as: 137 (UiO-66-NH2), 144 (CBAP-1 (DETA)), and 36.8 L g−1 (CBAP-1 (EDA)), respectively. The Langmuir isotherm model was observed to be a better fit of the adsorption data than the Freundlich model under most of the tested conditions. The superiority of UiO-66-NH2 was attributed to the van der Waals interactions between the linkers (framework) and the hydrocarbon “tail” (FA) coupled with interactions between its open metal sites and the FA carbonyl groups. This study demonstrated the good potential of these advanced functional materials toward the practical removal of gaseous FA in indoor environments.

Original languageEnglish
Article number108672
JournalEnvironmental Research
Volume178
DOIs
StatePublished - 2019 Nov 1

Fingerprint

Functional materials
formaldehyde
Formaldehyde
Adsorption
adsorption
DEET
Metals
material
Volatile Organic Compounds
Organic polymers
Partial Pressure
Poisons
metal
Hydrocarbons
partial pressure
Partial pressure
Activated carbon
activated carbon
volatile organic compound
Isotherms

Keywords

  • Adsorption
  • Air pollution controls (APCs)
  • Formaldehyde
  • Functionalized adsorbent
  • Metal organic frameworks (MOFs)

Cite this

Vikrant, Kumar ; Cho, Minkyu ; Khan, Azmatullah ; Kim, Ki-Hyun ; Ahn, Wha Seung ; Kwon, Eilhann E. / Adsorption properties of advanced functional materials against gaseous formaldehyde. In: Environmental Research. 2019 ; Vol. 178.
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title = "Adsorption properties of advanced functional materials against gaseous formaldehyde",
abstract = "Intense efforts have been made to eliminate toxic volatile organic compounds (VOCs) in indoor environments, especially formaldehyde (FA). In this study, the removal performances of gaseous FA using two metal-organic frameworks, MOF-5 and UiO-66-NH2, and two covalent-organic polymers, CBAP-1 (EDA) and CBAP-1 (DETA), along with activated carbon as a conventional reference material, were evaluated. To assess the removal capacity of FA under near-ambient conditions, a series of adsorption experiments were conducted at its concentrations/partial pressures of both low (0.1–0.5 ppm/0.01–0.05 Pa) and high ranges (5–25 ppm/0.5–2.5 Pa). Among all tested materials at the high-pressure region ㅐ (e.g., at 2.5 ppm FA), a maximum adsorption capacity of 69.7 mg g−1 was recorded by UiO-66-NH2. Moreover, UiO-66-NH2 also displayed the best 10{\%} breakthrough volume (BTV10) of 534 L g−1 (0.5 ppm FA) to 2963 L g−1 (0.1 ppm FA). In contrast, at the high concentration test (at 5, 10, and 25 ppm FA), the maximum BTV10 values were observed as: 137 (UiO-66-NH2), 144 (CBAP-1 (DETA)), and 36.8 L g−1 (CBAP-1 (EDA)), respectively. The Langmuir isotherm model was observed to be a better fit of the adsorption data than the Freundlich model under most of the tested conditions. The superiority of UiO-66-NH2 was attributed to the van der Waals interactions between the linkers (framework) and the hydrocarbon “tail” (FA) coupled with interactions between its open metal sites and the FA carbonyl groups. This study demonstrated the good potential of these advanced functional materials toward the practical removal of gaseous FA in indoor environments.",
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author = "Kumar Vikrant and Minkyu Cho and Azmatullah Khan and Ki-Hyun Kim and Ahn, {Wha Seung} and Kwon, {Eilhann E.}",
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Adsorption properties of advanced functional materials against gaseous formaldehyde. / Vikrant, Kumar; Cho, Minkyu; Khan, Azmatullah; Kim, Ki-Hyun; Ahn, Wha Seung; Kwon, Eilhann E.

In: Environmental Research, Vol. 178, 108672, 01.11.2019.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

T1 - Adsorption properties of advanced functional materials against gaseous formaldehyde

AU - Vikrant, Kumar

AU - Cho, Minkyu

AU - Khan, Azmatullah

AU - Kim, Ki-Hyun

AU - Ahn, Wha Seung

AU - Kwon, Eilhann E.

PY - 2019/11/1

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N2 - Intense efforts have been made to eliminate toxic volatile organic compounds (VOCs) in indoor environments, especially formaldehyde (FA). In this study, the removal performances of gaseous FA using two metal-organic frameworks, MOF-5 and UiO-66-NH2, and two covalent-organic polymers, CBAP-1 (EDA) and CBAP-1 (DETA), along with activated carbon as a conventional reference material, were evaluated. To assess the removal capacity of FA under near-ambient conditions, a series of adsorption experiments were conducted at its concentrations/partial pressures of both low (0.1–0.5 ppm/0.01–0.05 Pa) and high ranges (5–25 ppm/0.5–2.5 Pa). Among all tested materials at the high-pressure region ㅐ (e.g., at 2.5 ppm FA), a maximum adsorption capacity of 69.7 mg g−1 was recorded by UiO-66-NH2. Moreover, UiO-66-NH2 also displayed the best 10% breakthrough volume (BTV10) of 534 L g−1 (0.5 ppm FA) to 2963 L g−1 (0.1 ppm FA). In contrast, at the high concentration test (at 5, 10, and 25 ppm FA), the maximum BTV10 values were observed as: 137 (UiO-66-NH2), 144 (CBAP-1 (DETA)), and 36.8 L g−1 (CBAP-1 (EDA)), respectively. The Langmuir isotherm model was observed to be a better fit of the adsorption data than the Freundlich model under most of the tested conditions. The superiority of UiO-66-NH2 was attributed to the van der Waals interactions between the linkers (framework) and the hydrocarbon “tail” (FA) coupled with interactions between its open metal sites and the FA carbonyl groups. This study demonstrated the good potential of these advanced functional materials toward the practical removal of gaseous FA in indoor environments.

AB - Intense efforts have been made to eliminate toxic volatile organic compounds (VOCs) in indoor environments, especially formaldehyde (FA). In this study, the removal performances of gaseous FA using two metal-organic frameworks, MOF-5 and UiO-66-NH2, and two covalent-organic polymers, CBAP-1 (EDA) and CBAP-1 (DETA), along with activated carbon as a conventional reference material, were evaluated. To assess the removal capacity of FA under near-ambient conditions, a series of adsorption experiments were conducted at its concentrations/partial pressures of both low (0.1–0.5 ppm/0.01–0.05 Pa) and high ranges (5–25 ppm/0.5–2.5 Pa). Among all tested materials at the high-pressure region ㅐ (e.g., at 2.5 ppm FA), a maximum adsorption capacity of 69.7 mg g−1 was recorded by UiO-66-NH2. Moreover, UiO-66-NH2 also displayed the best 10% breakthrough volume (BTV10) of 534 L g−1 (0.5 ppm FA) to 2963 L g−1 (0.1 ppm FA). In contrast, at the high concentration test (at 5, 10, and 25 ppm FA), the maximum BTV10 values were observed as: 137 (UiO-66-NH2), 144 (CBAP-1 (DETA)), and 36.8 L g−1 (CBAP-1 (EDA)), respectively. The Langmuir isotherm model was observed to be a better fit of the adsorption data than the Freundlich model under most of the tested conditions. The superiority of UiO-66-NH2 was attributed to the van der Waals interactions between the linkers (framework) and the hydrocarbon “tail” (FA) coupled with interactions between its open metal sites and the FA carbonyl groups. This study demonstrated the good potential of these advanced functional materials toward the practical removal of gaseous FA in indoor environments.

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KW - Air pollution controls (APCs)

KW - Formaldehyde

KW - Functionalized adsorbent

KW - Metal organic frameworks (MOFs)

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