Search results for: Thaís R. Macedo

Items from 1 to 7 out of 7 results

article

Layered inorganic/organic mercaptopropyl pendant chain hybrid for chelating heavy cations

Thaís R. Macedo, Giovanni C. Petrucelli, Alane A. Pinto, Claudio Airoldi

Materials Research Bulletin > 2011 > 46 > 12 > 2346-2352

Heavy metal sorbents with uptake capacities for divalent cadmium and lead cation removal from aqueous solutions have been synthesized by grafting mercaptopropyltrimethoxysilane onto the surface of two different precursors obtained from lamellar ilerite, its acidic and the cetyltrimethylammonium exchanged forms. The organofunctionalization was carried out by two different procedures: reflux and solvent...

article

A useful organofunctionalized layered silicate for textile dye removal

Betina Royer, Natali F. Cardoso, Eder C. Lima, Thaís R. Macedo, more

Journal of Hazardous Materials > 2010 > 181 > 1-3 > 366-374

The octosilicate Na-RUB-18 has the ability to exchange its original sodium with cetyltrimethylammonium cations. This procedure leads to interlayer space expansion, with the aim of obtaining inorganic–organic nanostructured hybrids by chemical modification reactions. The silylating agent 3-trimethoxysilylpropylurea was attached to the inorganic layer using heterogeneous methodology. The new organofunctionalized...

article

Organofunctionalized RUB-18 from the intercalated precursor cetyltrimethylammonium cation

Thaís R. Macedo, Claudio Airoldi

Microporous and Mesoporous Materials > 2010 > 128 > 1-3 > 158-164

Crystalline layered sodium RUB-18 of the general formula Na ₂ Si ₈ O ₁₇ ·nH ₂ O was organofunctionalized after prior cetyltrimethylammonium ion intercalation. The intermediate cetyltrimethylammonium-exchanged RUB-18 (CTA-RUB-18) was used with three different types of silane coupling reagents: 3-aminopropyltriethoxysilane (N), N-3-trimethoxysilylpropylethylenediamine...

article

Organofunctionalized kenyaite for dye removal from aqueous solution

Betina Royer, Natali F. Cardoso, Eder C. Lima, Vanusa S.O. Ruiz, more

Journal of Colloid And Interface Science > 2009 > 336 > 2 > 398-405

Crystalline layered sodium kenyaite was exchanged to proton kenyaite when reacted with hydrochloric acid solution, providing a new surface with available silanol groups that are able to couple with N-3-trimethoxysilylpropylethylenediamine silylating agent, after prior expansion of the basal distance with the polar organic solvent dimethyl sulfoxide. The resulting organofunctionalized nanomaterial...

article

Silicic acid magadiite as a host for n-alkyldiamine guest molecules and features related to the thermodynamics of intercalation

Thaís R. Macedo, Giovanni C. Petrucelli, Claudio Airoldi

Clays and Clay Minerals > 2007 > 55 > 2 > 151-159

Somen-alkyldiamines with thegeneral formulae H₂N(CH₂)_nNH₂ (n = 2–5) were intercalated into the layered silicic acid magadiite, from aqueous solution, causing an increase in the original interlayer distance of 1172 pm. The synthetic magadiite and all intercalated compounds were characterized by elemental analysis, infrared vibrational spectroscopy, X-ray diffractometry, ²⁹Si nuclear magnetic resonance...

article

Crystalline polysilicate magadiite with intercalated n-alkylmonoamine and some correlations involving thermochemical data

Giovanni C. Petrucelli, Mauricio A. Meirinho, Thais R. Macedo, Claudio Airoldi

Thermochimica Acta > 2006 > 450 > 1-2 > 16-21

Synthesized hydrated lamellar acidic crystalline magadiite (H ₂ Si ₁₄ O ₂₉ ·2H ₂ O) nanocompound was used as host for intercalation of polar n-alkylmonoamine molecules of the general formula H ₃ C(CH ₂ ) _n NH ₂ (n=1–6) in aqueous solution. The original interlayer distance (d) of 1500pm, determined by X-ray powder diffraction patterns,...

article

Host lamellar silicic acid magadiite for some heterocyclic amine inclusions and quantitative calorimetric data

Thaís R. Macedo, Claudio Airoldi

Microporous and Mesoporous Materials > 2006 > 94 > 1-3 > 81-88

Both synthesized crystalline lamellar phylosilicate sodic magadiite and its converted acidic nanomaterial present inorganic layers maintained through weak interactive forces, containing orthosilicate units, with sodium or silanol groups between the layers. The protons from the silanol groups interact directly with the basic nitrogen atoms of the cyclic amines through hydrogen bonding formation in...

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Search results for: Thaís R. Macedo

Layered inorganic/organic mercaptopropyl pendant chain hybrid for chelating heavy cations

A useful organofunctionalized layered silicate for textile dye removal

Organofunctionalized RUB-18 from the intercalated precursor cetyltrimethylammonium cation

Organofunctionalized kenyaite for dye removal from aqueous solution

Silicic acid magadiite as a host for n-alkyldiamine guest molecules and features related to the thermodynamics of intercalation

Crystalline polysilicate magadiite with intercalated n-alkylmonoamine and some correlations involving thermochemical data

Host lamellar silicic acid magadiite for some heterocyclic amine inclusions and quantitative calorimetric data

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