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  • 1 Chemical Engineering Department, Polytechnic School, University of São Paulo, Sao Paulo, SP Brazil
  • | 2 School of Chemistry, Rio de Janeiro Federal University, Rio de Janeiro, RJ Brazil
  • | 3 Chemical Institute, University of São Paulo, Sao Paulo, SP Brazil
  • | 4 Geosciences Institute, University of São Paulo, Sao Paulo, SP Brazil
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Abstract  

This study investigates the sorption of toluene and naphthalene by a sodium bentonite (BFN), an organoclay (WS35) and by their respective iron oxide hydrate composites Mag_BFN and Mag_S35. The organic matter content of WS35 and Mag_S35, determined by thermogravimetry, was used to obtain their organic matter sorption coefficients, which show that they are effective sorbents to remove organic contaminants from water, with a higher selectivity for naphthalene than for toluene sorption. The main iron oxide phase present in Mag_BFN and Mag_S35 is maghemite (γ-Fe2O3), which allows these sorbents to be separated from the effluent by a magnetic separation process after use.