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

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19 Scopus citations


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
Issue number7
StatePublished - Jul 2012


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


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