Perchlorate removal by granular activated carbon coated with cetyltrimethyl ammonium chloride

Jian hong Xu, Nai yun Gao, Yang Deng, Ming hao Sui, Yu lin Tang

Research output: Contribution to journalArticleResearchpeer-review

28 Citations (Scopus)

Abstract

In this study, granular activated carbon (GAC) coated with cetyltrimethyl ammonium chloride (GAC-CTAC) was synthesized to remove perchlorate from water. Bench scale kinetics and adsorption isotherm tests were performed to evaluate the effects of factors affecting the adsorption efficiency, including the CTAC content, solution pH and ionic strength (I). When the content of CTAC on GAC increased from 0.031 to 0.16mmol/g, the rate constant in the pseudo-second order reaction was decreased from 46.35 to 23.24h.g/mmol, and the K value in the Freundlich equation was increased from 0.087 to 0.20mmol/g correspondingly. Typically, GAC-CTAC exhibited a higher adsorption capacity than GAC, which highlighted the key role of CTAC. The optimum perchlorate removal by GAC or GAC-CTAC was observed at pH 2-3, equivalent to pHpzc determined by zeta potential measurement. The adsorption capacity of perchlorate onto GAC-CTAC at pH 2.5 (0.36mmol/g) was 3.8 times as high as that onto GAC-CTAC at pH 5.6 (0.094mmol/g). Ionic strength appeared to significantly inhibit the perchlorate adsorption on GAC-CTAC. Finally, our results demonstrated that the primary mechanisms for the adsorption of perchlorate on GAC-CTAC were associated with electrostatic interaction, surface complexation and ion exchange.

Original languageEnglish
Pages (from-to)87-92
Number of pages6
JournalDesalination
Volume275
Issue number1-3
DOIs
StatePublished - 15 Jul 2011

Fingerprint

Ammonium Chloride
perchlorate
Activated carbon
activated carbon
ammonium
chloride
adsorption
Adsorption
Ionic strength
removal
Zeta potential
Coulomb interactions
Complexation
Adsorption isotherms
complexation
Rate constants
ion exchange
Ion exchange
isotherm

Keywords

  • Adsorption
  • Cetyltrimethyl ammonium chloride
  • Ion exchange
  • Perchlorate

Cite this

Xu, Jian hong ; Gao, Nai yun ; Deng, Yang ; Sui, Ming hao ; Tang, Yu lin. / Perchlorate removal by granular activated carbon coated with cetyltrimethyl ammonium chloride. In: Desalination. 2011 ; Vol. 275, No. 1-3. pp. 87-92.
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Perchlorate removal by granular activated carbon coated with cetyltrimethyl ammonium chloride. / Xu, Jian hong; Gao, Nai yun; Deng, Yang; Sui, Ming hao; Tang, Yu lin.

In: Desalination, Vol. 275, No. 1-3, 15.07.2011, p. 87-92.

Research output: Contribution to journalArticleResearchpeer-review

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T1 - Perchlorate removal by granular activated carbon coated with cetyltrimethyl ammonium chloride

AU - Xu, Jian hong

AU - Gao, Nai yun

AU - Deng, Yang

AU - Sui, Ming hao

AU - Tang, Yu lin

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N2 - In this study, granular activated carbon (GAC) coated with cetyltrimethyl ammonium chloride (GAC-CTAC) was synthesized to remove perchlorate from water. Bench scale kinetics and adsorption isotherm tests were performed to evaluate the effects of factors affecting the adsorption efficiency, including the CTAC content, solution pH and ionic strength (I). When the content of CTAC on GAC increased from 0.031 to 0.16mmol/g, the rate constant in the pseudo-second order reaction was decreased from 46.35 to 23.24h.g/mmol, and the K value in the Freundlich equation was increased from 0.087 to 0.20mmol/g correspondingly. Typically, GAC-CTAC exhibited a higher adsorption capacity than GAC, which highlighted the key role of CTAC. The optimum perchlorate removal by GAC or GAC-CTAC was observed at pH 2-3, equivalent to pHpzc determined by zeta potential measurement. The adsorption capacity of perchlorate onto GAC-CTAC at pH 2.5 (0.36mmol/g) was 3.8 times as high as that onto GAC-CTAC at pH 5.6 (0.094mmol/g). Ionic strength appeared to significantly inhibit the perchlorate adsorption on GAC-CTAC. Finally, our results demonstrated that the primary mechanisms for the adsorption of perchlorate on GAC-CTAC were associated with electrostatic interaction, surface complexation and ion exchange.

AB - In this study, granular activated carbon (GAC) coated with cetyltrimethyl ammonium chloride (GAC-CTAC) was synthesized to remove perchlorate from water. Bench scale kinetics and adsorption isotherm tests were performed to evaluate the effects of factors affecting the adsorption efficiency, including the CTAC content, solution pH and ionic strength (I). When the content of CTAC on GAC increased from 0.031 to 0.16mmol/g, the rate constant in the pseudo-second order reaction was decreased from 46.35 to 23.24h.g/mmol, and the K value in the Freundlich equation was increased from 0.087 to 0.20mmol/g correspondingly. Typically, GAC-CTAC exhibited a higher adsorption capacity than GAC, which highlighted the key role of CTAC. The optimum perchlorate removal by GAC or GAC-CTAC was observed at pH 2-3, equivalent to pHpzc determined by zeta potential measurement. The adsorption capacity of perchlorate onto GAC-CTAC at pH 2.5 (0.36mmol/g) was 3.8 times as high as that onto GAC-CTAC at pH 5.6 (0.094mmol/g). Ionic strength appeared to significantly inhibit the perchlorate adsorption on GAC-CTAC. Finally, our results demonstrated that the primary mechanisms for the adsorption of perchlorate on GAC-CTAC were associated with electrostatic interaction, surface complexation and ion exchange.

KW - Adsorption

KW - Cetyltrimethyl ammonium chloride

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