K 2 MgSiO 4 : A novel K + -trapped biodiesel heterogeneous catalyst produced from serpentinite Mg 3 Si 2 O 5 (OH) 4

Ballotin, Fabiane Carvalho; Cibaka, Thérèse Ebambi; Ribeiro-Santos, Tatiana A.; Santos, Eduardo A.; Teixeira, Ana Paula C.; Lago, Rochel M.

doi:10.1016/j.molcata.2016.02.006

Cited by 24 publications

(4 citation statements)

References 33 publications

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“…Interestingly, no crysotile phase was observed and usually this silicate mineral is very common in serpentinite samples (Teixeira et al, 2013). After 800 °C treatment in air atmosphere, it can be noticed several changes in the XRD patterns after hydrate magnesium silicate phase modifications, yielding new mineral peaks characterized as forsterite (Mg 2 SiO 4 , JCDPS 34-189), olivine [(Fe,Mg) 2 SiO 4 , JCDPS 2-1,343] and enstatite (MgSiO 3 , JCDPS 2-546) (Ballotin et al, 2016). There were no differences in mineral constitution in the serpentinite samples obtained after reducing atmosphere.…”

Section: Resultsmentioning

confidence: 98%

Carbon nanostructures supported on Co/serpentinite for sulfentrazone removal

Diogo,

Vieira,

Nascimento

et al. 2024

Front. Carbon

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The presence of environmental contaminants is a major problem today. In this context, it is necessary to develop new sustainable materials to be used to remediate these contaminants. In this work, the serpentinite rock was impregnated with cobalt, 5%, 10% and 20% and used as a support for the synthesis of carbon nanostructures by CVD (chemical vapour deposition) process, at 900°C. This temperature was chosen due to the high thermal stability of the carbon source. The materials were characterized by X-ray diffraction, Raman spectroscopy, thermal analysis, scanning and transmission microscopy. As expect the main phases formed were forsterite, Mg2SiO4, graphitic carbon and metallic cobalt. All the synthesis showed the formation of carbon structures as multiwalled carbon nanostructures over cobalt cores. The carbon structures showed good thermal stability, between 470 and 600°C. The higher the cobalt content, the higher the yield of the carbon structures synthesis, i.e. 14%, 23% and 37% for Serp5, Serp10 and Serp20, respectively. The produced materials were used to removal of the environmental contaminant sulfentrazone. After CVD process, the removal of sulfentrazone increase to 17.3%, 18.4% and 25.2% for Serp5, Serp10 and Serp20, respectively, showing an increase in sulfentrazone removal with the increase in carbon content. In addition, the percentage of sulfentrazone removal by Serp20 was greater at acidic pH values, decreasing from 41.7% to 12.7% with an increase from 2 to 10 in pH. The removal capacity obtained experimentally at a sulfentrazone concentration of 50 mg L−1 was equal to 14.9 mg g−1. According to literature and data obtained in this work, it was observed that the removal of contaminants from the aqueous medium occurred through two mechanisms: reduction of the organic compound by Co nanoparticles and adsorption carried out by carbon nanostructures.

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Section: Resultsmentioning

confidence: 98%

Carbon nanostructures supported on Co/serpentinite for sulfentrazone removal

Diogo,

Vieira,

Nascimento

et al. 2024

Front. Carbon

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“…The EDX analysis of the CaO/Clino green nanocomposite verified enrichment in the Ca and O content to 7.31 and 50.77%, confirming the formation of CaO as a new phase, in agreement with the concluded results from the X-ray diffraction (XRD) pattern (Figure C). The decline in the Si (28.49%) as well as Al (5.85%) content is an indication of their partial leaching or exchanging by Ca 2+ ions during the modification reaction under the influence of either the alkalinity conditions or the reducing effect of the green extract. − …”

Section: Resultsmentioning

confidence: 99%

Sonocogreen Decoration of Clinoptilolite by CaO Nanorods as Ecofriendly Catalysts in the Transesterification of Castor Oil into Biodiesel; Response Surface Studies

et al. 2021

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A CaO/clinoptilolite green nanocomposite (CaO/ Clino) was synthesized by a green modification technique using calcium nitrate and green tea extract. The CaO/Clino nanocomposite promises a total basicity of 4.82 mmol OH/g, surface area of 252.4 m 2 /g, and ion exchange capacity of 134.3 mequiv/ 100 g, which qualifies the product as an effective catalyst in the transesterification of castor oil. The transesterification performance of the CaO/Clino catalyst was addressed statistically based on the response surface methodology and central composite rotatable design, considering the essential experimental parameters. Based on the interaction effect between the studied variables, the CaO/ Clino catalyst can achieve an experimental biodiesel yield of 93.8% after 2.5 h at 120 °C with 3.5 wt % catalyst loading and 15:1 ethanol/castor oil molar ratio. The optimization function of the design suggested enhancement in the performance of the CaO/Clino catalyst to achieve a yield of 95.4% if the test time interval increased to 2.65 h and the ethanol content increased to 16:1 as a molar ratio to castor oil. The produced biodiesel over CaO/ClinO has acceptable technical qualifications according to the international requirements (EN 14214 and ASTM D-6751). The synthetic green CaO/Clino nanocomposite has better recyclability as a heterogeneous catalyst and higher activity than some investigated catalysts in literature.

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“…The band at 1601 cm −1 is attributed to stretching of the C–C bonds, while the bands at 1379 and 1213 cm −1 are attributed to deformation of the C–H bonds of the ring. At 1128 and 1036 cm −1 there are two bands assigned to asymmetric and symmetric stretching of the S–O bond 38, 39, 40.…”

Section: Resultsmentioning

confidence: 99%

“…The yield was obtained by calibration curve with methyl oleate concentrations ranging from 0 to 100 % 37. Quantification was done by taking into account the signal at 2.3 ppm (B1) for the hydrogen atom of the methylene α ‐carbonyl group, found in the triglyceride and the methyl ester, and the signal at 3.7 ppm (B2) for the methoxyl group found in the methyl ester 37–39. Thus, the ratio between signals B2/B1 was used to construct the calibration curve.…”

Section: Methodsmentioning

confidence: 99%

Versatile Hybrid Niobium Pentoxide‐Based Catalyst Applied in Reactions of the Fuels Industry: Oleic Acid Esterification and Quinoline Oxidation

Sturt

Moura

2021

Chem Eng & Technol

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Hybrid niobium‐based catalysts were synthesized and applied in two kinds of reactions: oleic acid esterification to produce biodiesel and oxidation of quinoline, an important contaminant of fossil fuels. Niobium oxides were functionalized with p‐toluenesulfonic acid, which conferred amphiphilic properties on the materials and an increase in Brønsted acidic sites due to the incorporation of sulfo groups on the material surface. The oleic acid esterification reaction with methanol showed very high efficiency of the hybrid material with 90 % conversion, even after three reuse cycles, under very mild conditions. Moreover, the catalyst was capable of promoting quinoline oxidation in a biphasic reaction.

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K 2 MgSiO 4 : A novel K + -trapped biodiesel heterogeneous catalyst produced from serpentinite Mg 3 Si 2 O 5 (OH) 4

Cited by 24 publications

References 33 publications

Carbon nanostructures supported on Co/serpentinite for sulfentrazone removal

Carbon nanostructures supported on Co/serpentinite for sulfentrazone removal

Sonocogreen Decoration of Clinoptilolite by CaO Nanorods as Ecofriendly Catalysts in the Transesterification of Castor Oil into Biodiesel; Response Surface Studies

Versatile Hybrid Niobium Pentoxide‐Based Catalyst Applied in Reactions of the Fuels Industry: Oleic Acid Esterification and Quinoline Oxidation

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