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Journal of Thermal Analysis and Calorimetry
Authors: Marilda Vianna, Jo Dweck, Frank Quina, Flavio Carvalho, and Claudio Nascimento

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.

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Journal of Thermal Analysis and Calorimetry
Authors: Marilda Vianna, Jo Dweck, Frank Quina, Flavio Carvalho, and Claudio Nascimento

Abstract  

Commercial bentonite (BFN) and organoclay (WS35), as well as iron oxide/clay composite (Mag_BFN) and iron/oxide organoclay composite (Mag_S35) were prepared for toluene and naphthalene sorption. Mag_BFN and Mag_S35 were obtained, respectively, by the precipitation of iron oxide hydrates onto sodium BFN and S35 clay particles. The materials were characterized by powder X-ray diffraction (XRD), X-ray Fluorescence (XRF), and TG and DTA. From XRF results and TG data on calcined mass basis, a quantitative method was developed to estimate the iron compound contents of the composites, as well as the organic matter content present in WS35 and Mag_S35.

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Partially exchanged organophilic bentonites

Part II. Phenol adsorption

Journal of Thermal Analysis and Calorimetry
Authors: Emerson Paes Barreto, Mariana Santos Lemos, Isabelle Bulhoes Aranha, Pedro Mauricio Büchler, and Jo Dweck

: 595 – 602 . 10.1007/s10973-005-0939-4 . 28. Vianna , MMG , Dweck , J , Kozievitch , VJ , Quina , FH , Carvalho , FMS , Nascimento , CAO . Toluene and naphthalene sorption by

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Partially exchanged organophilic bentonites

Part I. characterization by thermal analysis on calcined mass basis

Journal of Thermal Analysis and Calorimetry
Authors: Jo Dweck, Emerson Paes Barreto, Sergio Meth, and Pedro Mauricio Büchler

, Kozievitch , VJ , Quina , FH , Carvalho , FMS , Nascimento , CAO 2010 Toluene and naphthalene sorption by iron oxide/clay composites Part II. Adsorption experiments . J Therm Anal Calorim 101 3 887 – 892 10.1007/s10973

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Thermal analyis of hexadecyltrimethylammonium–montmorillonites

Part 1. Thermogravimetry, carbon and hydrogen analysis and thermo-IR spectroscopy analysis

Journal of Thermal Analysis and Calorimetry
Authors: Isaak Lapides, Mikhail Borisover, and Shmuel Yariv

.progpolymsci.2003.08.002 . 9. Vianna , MMGR , Dweck , J , Quina , FH , Carvalho , FMS , Nascimento , CAO . Toluene and naphthalene sorption by iron oxide/cly composites. Part II. Sorption

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Thermal analysis of hexadecyltrimethylammonium-montmorillonites

Part 2. Thermo-XRD-spectroscopy-analysis

Journal of Thermal Analysis and Calorimetry
Authors: Isaak Lapides, Mikhail Borisover, and Shmuel Yariv

-1961; cristobalite, PDF # 82-0512; 2001 . 29. Vianna , MMGR , Dweck , J , Quina , FH , Carvalho , FMS , Nascimento , CAO . Toluene and naphthalene sorption by iron oxide/clay composites Part

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