Efficient and versatile fibrous adsorbent based on magnetic amphiphilic composites of chrysotile/carbon nanostructures for the removal of ethynilestradiol

Teixeira, Ana Paula C.; Purceno, Aluir D.; Paula, Camila Cristina Almeida de; Silva, Julio César C. da; Ardisson, José D.; Lago, Rochel M.

doi:10.1016/j.jhazmat.2013.01.014

Cited by 27 publications

(7 citation statements)

References 36 publications

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“…The simultaneous presence of hydrophilic Si and Si-Al oxide surface and hydrophobic carbon nanotubes (CNT) and nanofibers (CNF), allow the composites to interact well with aqueous and different organic phases. Furthermore, the presence of magnetic cores on the composite enables its removal from different media by a simple magnetic separation process (Teixeira et al, 2013;Purceno et al, 2012). These characteristics make amphiphilic materials interesting adsorbents for organic pollutants in aqueous media.…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

Carbon nanostructures supported on Co/serpentinite for sulfentrazone removal

Diogo,

Vieira,

Nascimento

et al. 2024

Front. Carbon

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“…Flexible capabilities of chemical composition tuning -for example, by introducing various d-elements like Ni [18][19][20], Co [21], Fe [22][23][24] -and synthesis conditions allows to control surface properties (active sites) and area [25]. Hydroxyl groups reached surface together with the inner channel make chrysotile nanotubes favorable for adsorption and immobilization of various molecules [26][27][28] and heavy metal ions of Pb, Cd, Sr, and Nd [29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

On an adsorption/photocatalytic performance of nanotubular Mg3Si2O5(OH)4/TiO2 composite

Krasilin¹,

Bodalyov²,

Малков³

et al. 2018

Nanosystems: Phys. Chem. Math.

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Here, we study a performance of nanotubular Mg 3 Si 2 O 5 (OH) 4 /TiO 2 hybrid adsorbent/photocatalyst in the process of decolorizing an aqueous solution of crystal violet. The composite material was produced by hydrothermal treatment with one or more subsequent cycles of TiCl 4 treatment and vapor-phase hydrolysis according to the molecular layering technique. Decolorization was observed in situ by UV-VIS spectroscopy. It was found that TiO 2 deposition yields 2 to 3 times improvement of decolorization performance. Depending on TiO 2 phase typeamorphous or crystalline-this rise is related with either enhancement of adsorption rate either appearance of photocatalytic activity. Finally, fitting procedure issues in case of complex decolorization process were discussed.

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“…Microporous activated carbon is likely one of the best cost and efficient alternative for the adsorption of antibiotics [20,21]. However, diffusion into the micropores can be a limitation on the adsorption process due to the relatively large size of the antibiobitic molecules [22,23].…”

Section: Introductionmentioning

confidence: 99%