A comparison of figure of merit (FOM) for various materials in adsorptive removal of benzene under ambient temperature and pressure

Azmatullah Khan, Jan E. Szulejko, Ki Hyun Kim, Pallabi Sammadar, Sang Soo Lee, Xiao Yang, Yong Sik Ok

Research output: Contribution to journalArticle

  • 1 Citations

Abstract

To effectively remove gaseous pollutants from air using sorbents, a thorough knowledge of the actual sorption performance is needed at ambient conditions rather than at unrealistically high-pressure conditions, as is commonly presented in the literature. To this end, the sorbent capacities of gaseous benzene were evaluated at a constant sorbent bed inlet pressure (50 ppm or ~5 Pa) in 1 atm of N2, room temperature (298 K), a fixed flow rate (50 mL min−1), and equal outlet sampling intervals (5 min). The benzene adsorption patterns were investigated against six sorbent types in a total of 17 different forms: 1- zeolite in five forms: beads (ZB), ground to 212 µm (ZG212), beads ground to 300 µm (ZG300), coarsely ground/washed zeolite (ZWc), and coarsely ground/washed/thermally treated zeolite (ZTc), 2- activated carbon in two forms: 212 µm (ACd212) and granular (ACdg), 3- Carbopack-X (CX), 4- Tenax TA (TA), 5- used black tea leaves of 150 or 300 µm in three forms: dry (TD150/TD300), wet (TW150/TW300), and wet dust (TWd), and 6- used ground coffee in either dry (CD) or wet forms (CW). Accordingly, the largest adsorption capacities at 5 Pa (e.g., >10 mg g−1) were observed for ACd212 (79.1) and ACdg (73.6). Moderate values (e.g., 5 < < 10 mg g−1) were obtained for ZG212 (7.98), CX (6.79), ZG300 (5.70), and ZB (5.58), while the remainder were far lower at < 5 mg g−1 (e.g., tea leaves, ground coffee, TA, ZWc, and ZTc). The experimental benzene capacities of the tested sorbents were further assessed by the Langmuir, Henry's law, Freundlich, Dubinin-Radushkevich, and Elovich isotherm models. The linearized Langmuir adsorption isotherms of ACd212, ACdg, and CX showed the presence of more than one adsorption site (i.e., retrograde at the lowest pressures and two others at higher pressures). However, TA, zeolite, tea leaves, and ground coffee exhibited a type-V isotherm, wherein the sorption capacity continued to increase with loaded volume (i.e., multilayer adsorption). Thus, ACd212 has the best figure-of-merit based on a high 10% breakthrough volume (BTV) and low cost for real-world applications.

LanguageEnglish
Pages96-108
Number of pages13
JournalEnvironmental Research
Volume168
DOIs
Publication statusPublished - 2019 Jan 1

Fingerprint

Zeolites
Sorbents
Benzene
Adsorption
benzene
zeolite
Coffee
adsorption
tea
Pressure
Tea
coffee
Temperature
isotherm
temperature
Isotherms
Sorption
sorption
Air Pollutants
Dust

Keywords

  • Activated carbon
  • Benzene
  • Retrograde isotherms
  • Sorption
  • Tea and coffee leaves

ASJC Scopus subject areas

  • Biochemistry
  • Environmental Science(all)

Cite this

A comparison of figure of merit (FOM) for various materials in adsorptive removal of benzene under ambient temperature and pressure. / Khan, Azmatullah; Szulejko, Jan E.; Kim, Ki Hyun; Sammadar, Pallabi; Lee, Sang Soo; Yang, Xiao; Ok, Yong Sik.

In: Environmental Research, Vol. 168, 01.01.2019, p. 96-108.

Research output: Contribution to journalArticle

Khan, Azmatullah ; Szulejko, Jan E. ; Kim, Ki Hyun ; Sammadar, Pallabi ; Lee, Sang Soo ; Yang, Xiao ; Ok, Yong Sik. / A comparison of figure of merit (FOM) for various materials in adsorptive removal of benzene under ambient temperature and pressure. In: Environmental Research. 2019 ; Vol. 168. pp. 96-108.
@article{f793f0556ea04936906f2def4824123f,
title = "A comparison of figure of merit (FOM) for various materials in adsorptive removal of benzene under ambient temperature and pressure",
abstract = "To effectively remove gaseous pollutants from air using sorbents, a thorough knowledge of the actual sorption performance is needed at ambient conditions rather than at unrealistically high-pressure conditions, as is commonly presented in the literature. To this end, the sorbent capacities of gaseous benzene were evaluated at a constant sorbent bed inlet pressure (50 ppm or ~5 Pa) in 1 atm of N2, room temperature (298 K), a fixed flow rate (50 mL min−1), and equal outlet sampling intervals (5 min). The benzene adsorption patterns were investigated against six sorbent types in a total of 17 different forms: 1- zeolite in five forms: beads (ZB), ground to 212 µm (ZG212), beads ground to 300 µm (ZG300), coarsely ground/washed zeolite (ZWc), and coarsely ground/washed/thermally treated zeolite (ZTc), 2- activated carbon in two forms: 212 µm (ACd212) and granular (ACdg), 3- Carbopack-X (CX), 4- Tenax TA (TA), 5- used black tea leaves of 150 or 300 µm in three forms: dry (TD150/TD300), wet (TW150/TW300), and wet dust (TWd), and 6- used ground coffee in either dry (CD) or wet forms (CW). Accordingly, the largest adsorption capacities at 5 Pa (e.g., >10 mg g−1) were observed for ACd212 (79.1) and ACdg (73.6). Moderate values (e.g., 5 < < 10 mg g−1) were obtained for ZG212 (7.98), CX (6.79), ZG300 (5.70), and ZB (5.58), while the remainder were far lower at < 5 mg g−1 (e.g., tea leaves, ground coffee, TA, ZWc, and ZTc). The experimental benzene capacities of the tested sorbents were further assessed by the Langmuir, Henry's law, Freundlich, Dubinin-Radushkevich, and Elovich isotherm models. The linearized Langmuir adsorption isotherms of ACd212, ACdg, and CX showed the presence of more than one adsorption site (i.e., retrograde at the lowest pressures and two others at higher pressures). However, TA, zeolite, tea leaves, and ground coffee exhibited a type-V isotherm, wherein the sorption capacity continued to increase with loaded volume (i.e., multilayer adsorption). Thus, ACd212 has the best figure-of-merit based on a high 10{\%} breakthrough volume (BTV) and low cost for real-world applications.",
keywords = "Activated carbon, Benzene, Retrograde isotherms, Sorption, Tea and coffee leaves",
author = "Azmatullah Khan and Szulejko, {Jan E.} and Kim, {Ki Hyun} and Pallabi Sammadar and Lee, {Sang Soo} and Xiao Yang and Ok, {Yong Sik}",
year = "2019",
month = "1",
day = "1",
doi = "10.1016/j.envres.2018.09.019",
language = "English",
volume = "168",
pages = "96--108",
journal = "Environmental Research",
issn = "0013-9351",
publisher = "Academic Press Inc.",

}

TY - JOUR

T1 - A comparison of figure of merit (FOM) for various materials in adsorptive removal of benzene under ambient temperature and pressure

AU - Khan, Azmatullah

AU - Szulejko, Jan E.

AU - Kim, Ki Hyun

AU - Sammadar, Pallabi

AU - Lee, Sang Soo

AU - Yang, Xiao

AU - Ok, Yong Sik

PY - 2019/1/1

Y1 - 2019/1/1

N2 - To effectively remove gaseous pollutants from air using sorbents, a thorough knowledge of the actual sorption performance is needed at ambient conditions rather than at unrealistically high-pressure conditions, as is commonly presented in the literature. To this end, the sorbent capacities of gaseous benzene were evaluated at a constant sorbent bed inlet pressure (50 ppm or ~5 Pa) in 1 atm of N2, room temperature (298 K), a fixed flow rate (50 mL min−1), and equal outlet sampling intervals (5 min). The benzene adsorption patterns were investigated against six sorbent types in a total of 17 different forms: 1- zeolite in five forms: beads (ZB), ground to 212 µm (ZG212), beads ground to 300 µm (ZG300), coarsely ground/washed zeolite (ZWc), and coarsely ground/washed/thermally treated zeolite (ZTc), 2- activated carbon in two forms: 212 µm (ACd212) and granular (ACdg), 3- Carbopack-X (CX), 4- Tenax TA (TA), 5- used black tea leaves of 150 or 300 µm in three forms: dry (TD150/TD300), wet (TW150/TW300), and wet dust (TWd), and 6- used ground coffee in either dry (CD) or wet forms (CW). Accordingly, the largest adsorption capacities at 5 Pa (e.g., >10 mg g−1) were observed for ACd212 (79.1) and ACdg (73.6). Moderate values (e.g., 5 < < 10 mg g−1) were obtained for ZG212 (7.98), CX (6.79), ZG300 (5.70), and ZB (5.58), while the remainder were far lower at < 5 mg g−1 (e.g., tea leaves, ground coffee, TA, ZWc, and ZTc). The experimental benzene capacities of the tested sorbents were further assessed by the Langmuir, Henry's law, Freundlich, Dubinin-Radushkevich, and Elovich isotherm models. The linearized Langmuir adsorption isotherms of ACd212, ACdg, and CX showed the presence of more than one adsorption site (i.e., retrograde at the lowest pressures and two others at higher pressures). However, TA, zeolite, tea leaves, and ground coffee exhibited a type-V isotherm, wherein the sorption capacity continued to increase with loaded volume (i.e., multilayer adsorption). Thus, ACd212 has the best figure-of-merit based on a high 10% breakthrough volume (BTV) and low cost for real-world applications.

AB - To effectively remove gaseous pollutants from air using sorbents, a thorough knowledge of the actual sorption performance is needed at ambient conditions rather than at unrealistically high-pressure conditions, as is commonly presented in the literature. To this end, the sorbent capacities of gaseous benzene were evaluated at a constant sorbent bed inlet pressure (50 ppm or ~5 Pa) in 1 atm of N2, room temperature (298 K), a fixed flow rate (50 mL min−1), and equal outlet sampling intervals (5 min). The benzene adsorption patterns were investigated against six sorbent types in a total of 17 different forms: 1- zeolite in five forms: beads (ZB), ground to 212 µm (ZG212), beads ground to 300 µm (ZG300), coarsely ground/washed zeolite (ZWc), and coarsely ground/washed/thermally treated zeolite (ZTc), 2- activated carbon in two forms: 212 µm (ACd212) and granular (ACdg), 3- Carbopack-X (CX), 4- Tenax TA (TA), 5- used black tea leaves of 150 or 300 µm in three forms: dry (TD150/TD300), wet (TW150/TW300), and wet dust (TWd), and 6- used ground coffee in either dry (CD) or wet forms (CW). Accordingly, the largest adsorption capacities at 5 Pa (e.g., >10 mg g−1) were observed for ACd212 (79.1) and ACdg (73.6). Moderate values (e.g., 5 < < 10 mg g−1) were obtained for ZG212 (7.98), CX (6.79), ZG300 (5.70), and ZB (5.58), while the remainder were far lower at < 5 mg g−1 (e.g., tea leaves, ground coffee, TA, ZWc, and ZTc). The experimental benzene capacities of the tested sorbents were further assessed by the Langmuir, Henry's law, Freundlich, Dubinin-Radushkevich, and Elovich isotherm models. The linearized Langmuir adsorption isotherms of ACd212, ACdg, and CX showed the presence of more than one adsorption site (i.e., retrograde at the lowest pressures and two others at higher pressures). However, TA, zeolite, tea leaves, and ground coffee exhibited a type-V isotherm, wherein the sorption capacity continued to increase with loaded volume (i.e., multilayer adsorption). Thus, ACd212 has the best figure-of-merit based on a high 10% breakthrough volume (BTV) and low cost for real-world applications.

KW - Activated carbon

KW - Benzene

KW - Retrograde isotherms

KW - Sorption

KW - Tea and coffee leaves

UR - http://www.scopus.com/inward/record.url?scp=85054320275&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85054320275&partnerID=8YFLogxK

U2 - 10.1016/j.envres.2018.09.019

DO - 10.1016/j.envres.2018.09.019

M3 - Article

VL - 168

SP - 96

EP - 108

JO - Environmental Research

T2 - Environmental Research

JF - Environmental Research

SN - 0013-9351

ER -