Effective Microporosity for Enhanced Adsorption Capacity of Cr (VI) from Dilute Aqueous Solution: Isotherm and Kinetics

Mukosha Lloyd, Maurice S. Onyango, Aoyi Ochieng, John Siame

Research output: Contribution to journalArticle

Abstract

The adsorbent pore structure significant to enhanced adsorption capacity of Cr (VI) from dilute aqueous solution is evaluated. As reference, low-cost micro-mesoporous activated carbon (AC) of high basicity, mesoporosity centred about 2.4 nm, and effective microporosity centred about 0.9 nm was tested for removal of Cr (VI) from dilute aqueous solution in batch mode. At pH 2 the low-cost AC exhibited highly improved Langmuir Cr (VI) capacity of 115 mg/g which was competitive to high performance commercial AC. A Comparison with treated characterization results of literature adsorbents/ACs showed that moderate to high effective micropore volume of average pore-size about 0.9 ± 0.1 nm is critical for increased adsorption capacity of Cr (VI) from dilute aqueous solutions. The mesostructure of the tested low-cost AC was associated with rapid kinetics that was fitted by the Pseudo-second kinetics model. While Biot numbers suggested slight significant contribution of intraparticle diffusion. It is hoped that this study may be a useful contribution to
development of effective adsorbents for the efficient abatement of toxic Cr (VI) from wastewater and water.
Original languageEnglish
Article numberCSIJ.34082
Pages (from-to)1-12
Number of pages12
JournalChemical Science International Journal
Volume19
Issue number4
DOIs
Publication statusPublished - 2017

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Microporosity
Isotherms
Activated carbon
Adsorption
Kinetics
Adsorbents
Costs
Poisons
Alkalinity
Pore structure
Pore size
Wastewater
chromium hexavalent ion
Water

Cite this

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title = "Effective Microporosity for Enhanced Adsorption Capacity of Cr (VI) from Dilute Aqueous Solution: Isotherm and Kinetics",
abstract = "The adsorbent pore structure significant to enhanced adsorption capacity of Cr (VI) from dilute aqueous solution is evaluated. As reference, low-cost micro-mesoporous activated carbon (AC) of high basicity, mesoporosity centred about 2.4 nm, and effective microporosity centred about 0.9 nm was tested for removal of Cr (VI) from dilute aqueous solution in batch mode. At pH 2 the low-cost AC exhibited highly improved Langmuir Cr (VI) capacity of 115 mg/g which was competitive to high performance commercial AC. A Comparison with treated characterization results of literature adsorbents/ACs showed that moderate to high effective micropore volume of average pore-size about 0.9 ± 0.1 nm is critical for increased adsorption capacity of Cr (VI) from dilute aqueous solutions. The mesostructure of the tested low-cost AC was associated with rapid kinetics that was fitted by the Pseudo-second kinetics model. While Biot numbers suggested slight significant contribution of intraparticle diffusion. It is hoped that this study may be a useful contribution todevelopment of effective adsorbents for the efficient abatement of toxic Cr (VI) from wastewater and water.",
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Effective Microporosity for Enhanced Adsorption Capacity of Cr (VI) from Dilute Aqueous Solution : Isotherm and Kinetics. / Lloyd, Mukosha; Onyango, Maurice S.; Ochieng, Aoyi; Siame, John.

In: Chemical Science International Journal, Vol. 19, No. 4, CSIJ.34082, 2017, p. 1-12.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Effective Microporosity for Enhanced Adsorption Capacity of Cr (VI) from Dilute Aqueous Solution

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AU - Lloyd, Mukosha

AU - Onyango, Maurice S.

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AU - Siame, John

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AB - The adsorbent pore structure significant to enhanced adsorption capacity of Cr (VI) from dilute aqueous solution is evaluated. As reference, low-cost micro-mesoporous activated carbon (AC) of high basicity, mesoporosity centred about 2.4 nm, and effective microporosity centred about 0.9 nm was tested for removal of Cr (VI) from dilute aqueous solution in batch mode. At pH 2 the low-cost AC exhibited highly improved Langmuir Cr (VI) capacity of 115 mg/g which was competitive to high performance commercial AC. A Comparison with treated characterization results of literature adsorbents/ACs showed that moderate to high effective micropore volume of average pore-size about 0.9 ± 0.1 nm is critical for increased adsorption capacity of Cr (VI) from dilute aqueous solutions. The mesostructure of the tested low-cost AC was associated with rapid kinetics that was fitted by the Pseudo-second kinetics model. While Biot numbers suggested slight significant contribution of intraparticle diffusion. It is hoped that this study may be a useful contribution todevelopment of effective adsorbents for the efficient abatement of toxic Cr (VI) from wastewater and water.

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