Xerogel p-anisidinapropilsílica: estudo da estabilidade térmica e da resistência à lixiviação com solventes

Franken, Leonardo; Santos, Lisiane Santos dos; Caramão, Elina Bastos; Costa, Tânia Maria Haas; Benvenutti, Edílson V.

doi:10.1590/s0100-40422002000400010

Cited by 8 publications

(6 citation statements)

References 18 publications

(25 reference statements)

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“…For the BS and BSW sample, the first mass loss ∘ C) is ascribed to moisture loss [20]. The second mass loss (90-180 ∘ C) corresponds to the loss of physically adsorbed water from the surface [21].…”

Section: Thermogravimetric Analysismentioning

confidence: 99%

Green Synthesis and Characterization of Biosilica Produced from Sugarcane Waste Ash

Alves

Reis

Rovani

et al. 2017

Journal of Chemistry

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In this study, ash from sugarcane waste was used in the synthesis of biosilica using alkaline extraction followed by acid precipitation. Different parameters that could influence the silica particle synthesis were evaluated. The ash and synthesized biosilica were characterized by a combination of spectroscopic and chemical techniques such as XRD, XRF, SEM, particle size analyser, N 2 adsorption analysis, TGA, and FTIR. The best condition for biosilica production was achieved with fusion method and aging temperature of 80 ∘ C for 1 h during gel formation. X-ray powder diffraction pattern confirms the amorphous nature of synthesized silica. The purity of the prepared silica was 99% silica which was confirmed by means of XRF. The experimental data suggest that the sugarcane waste ash could be converted into a value-added product, minimizing the environmental impact of disposal problems.

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Section: Thermogravimetric Analysismentioning

confidence: 99%

Green Synthesis and Characterization of Biosilica Produced from Sugarcane Waste Ash

Alves

Reis

Rovani

et al. 2017

Journal of Chemistry

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“…In previous works, it was observed that the organic grade in the final hybrid xerogel was not linear with the organics/TEOS ratio used in the synthesis, and saturation in organic grade was attained [21]. Additionally, the quantity of oligomers formed increases with the organics/ TEOS ratio increasing [22], which causes a major leaching process during the washing with different solvents after the synthesis [23].…”

Section: Discussionmentioning

confidence: 94%

Influence of the synthesis conditions on the characteristics and metal adsorption properties of the 3-(1,4-phenylenediamine)propylsilica xerogel

et al. 2005

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The hybrid 3-(1,4-phenylenediamine)propylsilica xerogel was obtained starting from two different organic precursor quantity (5 and 8 mmol) to 22 mmol of TEOS, in the synthesis. The xerogel samples were characterized by using CHN elemental analysis, N2 adsorption-desorption isotherms, infrared thermal analysis. The xerogel was used as metal sorbent for Cu2+, Cd2+ and Pb2+ in aqueous solution with concentration range of 10-3 to 10-5 mmol l-1. The quantity of organic precursor added in the synthesis influences the characteristics of the xerogel as morphology and thermal stability, as well as the metal adsorption capacity.

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“…The characterization of the modified surface is performed with techniques like S BET (Brunauer-Emmett-Teller isotherm) [26], which estimates the surface of a solid, elemental analysis and combined FTIR [27][28][29] and RMN solid state techniques [30][31], which provide a good characterization of the product.…”

Section: Figure 2: Different Types Of the Sililants Agents Union In Tmentioning

confidence: 99%

Adsorption Essays of Palladium in Modified Silica Gel With Thiouronium Groups: Experimental and Theorical Studies

Schott

et al. 2011

J. Chil. Chem. Soc.

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The silylant 3-cloropropyltriethoxysilyl was anchored over silica gel in anhydrous conditions in order to react with thiourea to obtain modified silica gel with thiouronium. The aim to obtain an inorganic support that is able to hijack metals from the VIII group such as palladium. The product was characterized by S BET and FTIR infrared spectroscopy. For the determination of the structure in the modified silica gel NMR spectra of silicon and carbon were preformed in solid state. The coordination form of the modified silica gel to the metal was studied computationally in the context of the DFT theory, using the ADF code. This was a collaborative work with "Fundación Chile" for the recuperation of precious metals from the mining industry.

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Xerogel p-anisidinapropilsílica: estudo da estabilidade térmica e da resistência à lixiviação com solventes

Cited by 8 publications

References 18 publications

Green Synthesis and Characterization of Biosilica Produced from Sugarcane Waste Ash

Green Synthesis and Characterization of Biosilica Produced from Sugarcane Waste Ash

Influence of the synthesis conditions on the characteristics and metal adsorption properties of the 3-(1,4-phenylenediamine)propylsilica xerogel

Adsorption Essays of Palladium in Modified Silica Gel With Thiouronium Groups: Experimental and Theorical Studies

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