Adsorption of microcystin-LR from water with iron oxide nanoparticles

Yu Qiong Gao, Nai Yun Gao, Yang Deng, Jin Shan Gu, Yi Chen Shen, Shao Xiang Wang

Research output: Contribution to journalArticleResearchpeer-review

12 Citations (Scopus)

Abstract

Adsorption of microcystin-LR (MC-LR) from water using iron oxide (α-Fe2O3) nanoparticles was investigated in this study. Adsorption of MC-LR adsorption was well-described by a pseudo second order kinetics model and Freundlich and Langmuir isotherm equations at 15 to 35°C. Thermodynamic analysis showed that the Gibbs free energy was negative, whereas standard enthalpy and entropy changes were positive at this temperature range. These findings suggest that the adsorption of MC-LR on iron oxide nanoparticles was spontaneous and endothermic. The effects of initial pH, inorganic cations, and competing compounds with carboxyl groups on absorption of MC-LR were also evaluated. Typically, adsorption efficiency decreased with increasing pH from 2 to 11. Sodium ions did not appear to significantly affect MC-LR adsorption, whereas calcium ions slightly enhanced the MC-LR adsorption capacity of the iron oxide nanoparticles. Moreover, the inhibiting effect of competing organic compounds was increased with increasing numbers of carboxyl groups, as follows: citric acid (3) > oxalic acid (2) > benzoic acid (1).

Original languageEnglish
Pages (from-to)562-568
Number of pages7
JournalWater Environment Research
Volume84
Issue number7
DOIs
StatePublished - 1 Jan 2012

Fingerprint

iron oxide
Nanoparticles
adsorption
Adsorption
Water
water
Ions
Oxalic Acid
Benzoic Acid
Gibbs free energy
ion
oxalic acid
citric acid
cyanoginosin LR
ferric oxide
nanoparticle
enthalpy
Organic compounds
Citric Acid
entropy

Keywords

  • Adsorption
  • Carboxyl group
  • Inorganic cations
  • Kinetics
  • pH

Cite this

Gao, Yu Qiong ; Gao, Nai Yun ; Deng, Yang ; Gu, Jin Shan ; Shen, Yi Chen ; Wang, Shao Xiang. / Adsorption of microcystin-LR from water with iron oxide nanoparticles. In: Water Environment Research. 2012 ; Vol. 84, No. 7. pp. 562-568.
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abstract = "Adsorption of microcystin-LR (MC-LR) from water using iron oxide (α-Fe2O3) nanoparticles was investigated in this study. Adsorption of MC-LR adsorption was well-described by a pseudo second order kinetics model and Freundlich and Langmuir isotherm equations at 15 to 35°C. Thermodynamic analysis showed that the Gibbs free energy was negative, whereas standard enthalpy and entropy changes were positive at this temperature range. These findings suggest that the adsorption of MC-LR on iron oxide nanoparticles was spontaneous and endothermic. The effects of initial pH, inorganic cations, and competing compounds with carboxyl groups on absorption of MC-LR were also evaluated. Typically, adsorption efficiency decreased with increasing pH from 2 to 11. Sodium ions did not appear to significantly affect MC-LR adsorption, whereas calcium ions slightly enhanced the MC-LR adsorption capacity of the iron oxide nanoparticles. Moreover, the inhibiting effect of competing organic compounds was increased with increasing numbers of carboxyl groups, as follows: citric acid (3) > oxalic acid (2) > benzoic acid (1).",
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Adsorption of microcystin-LR from water with iron oxide nanoparticles. / Gao, Yu Qiong; Gao, Nai Yun; Deng, Yang; Gu, Jin Shan; Shen, Yi Chen; Wang, Shao Xiang.

In: Water Environment Research, Vol. 84, No. 7, 01.01.2012, p. 562-568.

Research output: Contribution to journalArticleResearchpeer-review

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AU - Wang, Shao Xiang

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AB - Adsorption of microcystin-LR (MC-LR) from water using iron oxide (α-Fe2O3) nanoparticles was investigated in this study. Adsorption of MC-LR adsorption was well-described by a pseudo second order kinetics model and Freundlich and Langmuir isotherm equations at 15 to 35°C. Thermodynamic analysis showed that the Gibbs free energy was negative, whereas standard enthalpy and entropy changes were positive at this temperature range. These findings suggest that the adsorption of MC-LR on iron oxide nanoparticles was spontaneous and endothermic. The effects of initial pH, inorganic cations, and competing compounds with carboxyl groups on absorption of MC-LR were also evaluated. Typically, adsorption efficiency decreased with increasing pH from 2 to 11. Sodium ions did not appear to significantly affect MC-LR adsorption, whereas calcium ions slightly enhanced the MC-LR adsorption capacity of the iron oxide nanoparticles. Moreover, the inhibiting effect of competing organic compounds was increased with increasing numbers of carboxyl groups, as follows: citric acid (3) > oxalic acid (2) > benzoic acid (1).

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