Characterisation of silica-supported Fe–Ni bimetallic nanoparticles and kinetic study of reductive degradation of the drug nimesulide

Gonçalves, Andressa Aparecida; Araujo, A. F.; Mesquita, João Paulo de; Pires, M. J. M.; Verly, Rodrigo M.; Silva, Leonardo M. Da; Franco, Débora V.

doi:10.1016/j.jece.2016.09.038

Cited by 18 publications

(7 citation statements)

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“…Thus, to avoid this undesirable phenomenon, these ferromagnetic nanoparticles are commonly stabilised/encapsulated using carboxymethyl cellulose (CMC) or chitosan (CHI). In addition, some studies reported the stabilisation of ferromagnetic nanoparticles by means of supporting them on silica microparticles 11-12 , [14][15][16] . It is worth mentioning that CHI is an important polymeric material used in the field of environmental nanotechnology due its interesting properties such as good biodegradability, biocompatibility, and low immunogenicity 17,18 .…”

Section: Introductionmentioning

confidence: 99%

Synthesis of chitosan-stabilised bimetallic nanoparticles containing Fe and Ni and the reductive degradation of nimesulide

et al. 2018

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Chitosan (CHI)-stabilised Ni–Fe bimetallic nanoparticles (bNP/CHI) were synthesised varying the content of nickel and denoted as 2-bNP/CHI, 17-bNP/CHI, and 27-bNP/CHI. The nanoparticles were characterised using several techniques and used in the removal of nimesulide. XRD and Mössbauer analyses confirmed the formation of an amorphous structure containing Fe0 and Fe2O3 while the FT-IR analysis confirmed the presence of chitosan in the nanoparticles. A very high removal of nimesulide was obtained after only 15 min of treatment with the 17-bNP/CHI system. The by-product obtained after the reductive treatment was identified using the chromatography analysis coupled to the mass spectrometry technique.

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Section: Introductionmentioning

confidence: 99%

Synthesis of chitosan-stabilised bimetallic nanoparticles containing Fe and Ni and the reductive degradation of nimesulide

et al. 2018

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“…Posteriormente, a redução do poluente será promovida pela adsorção desses radicais H . na sua estrutura molecular [43].…”

Section: -Indústria De Fundiçãounclassified

“…A sílica (SiO 2 ) é um dos óxidos mais abundantes da crosta terrestre e está sendo muito utilizada em trabalhos científicos para proteger nanopartículas de metais com propriedade magnética, diminuindo assim a aglomeração dos grãos [44]. Estudos revelaram que além de garantir elevada estabilidade para as nanopartículas de ferro e níquel, a sílica também as protegeu contra a oxidação no meio ambiente, aumentando assim a reatividade [43].…”

Section: Toxicidade Do Cromo Limites De Tolerância E Máximos Permitidosunclassified

“…Para esta síntese foi seguida a metodologia experimental encontrada em GONÇALVES, Andressa A. et al [43], com algumas adaptações, da mesma forma da síntese anterior.…”

Section: Síntese Das Nanopartículas De Fe 0 -Ni 0 Suportadas Em Siounclassified

“…A metodologia aplicada para a redução do cromo hexavalente foi a mesma empregada nas nanopartículas de Fe 0 -Ni 0 /SiO 2 , variando apenas a massa do material e as soluções de dicromato de potássio de 40 µmol/L, 60 µmol/L e 80 µmol/L foram as mesmas preparadas anteriormente. Os materiais, reagentes e equipamentos empregados no preparo desta solução encontram-se na Tabela 12: [43], e a solução de nitrato de ferro III nonahidratado tem pH ácido em torno de 1,3, este fato pode ter colaborado para baixo rendimento na redução. Devido a este baixo rendimento, foi realizado um novo procedimento experimental com outros reagentes químicos.…”

Section: Redução Com Lã De Açounclassified

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Síntese De Partículas Nanoestruturadas De Fe0-Ni0 /Si02 Para Redução Do Cromo Hexavalente Para Cromo Trivalente

CORREIA¹

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µmol/L) com tempos inferiores a 5 minutos. Contudo, as nanopartículas de Fe 0 -Ni 0 suportadas em SiO 2 reduziram o cromo hexavalente com uma quantidade em massa de Fe 0 aproximadamente 110 vezes menor em relação a lã de aço, considerando que este é constituído unicamente por ferro metálico. Credita-se esta efetividade à maior área superficial por unidade de massa das partículas nanoestruturadas. Palavras-chaveCromo hexavalente; nanopartículas bimetálicas; ferro metálico; metais pesados.In the present work, two alternative forms were approached using different materials. For one of the materials, nanoparticles of metallic iron, metallic nickel and silica as support were synthesized, and the other material aiming at lower cost and greater accessibility will be steel wool. Both have the objective of reducing or remediation of hexavalent chromium through solutions of potassium dichromate in concentrations that aim to simulate contaminations generated by various industrial operations. The function of these materials is to act as a strong reducing agent by donating electrons to reduce the hexavalent chromium to trivalent chromium. The nanoparticles of zero-valent Iron, zerovalent nickel supported on silica was synthesized using sulfates in a reduction technique with potassium borohydride in aqueous solution. The nanoparticles were characterized with the help of the XRD technique, from the diffraction pattern generated and quantifying the present phases, and SEM / EDS, defining elemental chemical composition and surface morphology and ICP to quantify the elemental composition. Finally, the tests of reduction of the hexavalent chromium in trivalent chromium through the UV-VIS spectrophotometer were carried out, and the concentration of hexavalent Chromium present in the solution was quantified through the Colorimetric technique with the highly selective reagent, 1,5-diphenylcarbazide (DFC). Nanoparticles and steel wool showed efficiency in the reduction of hexavalent chromium at concentrations of 8,32 ppm (K 2 Cr 2 O 7 80 µmol/L), 6,241 (K 2 Cr 2 O 7 60 µmol/L) e 4,161 ppm (K 2 Cr 2 O 7 40 µmol/L) with times less than 5 minutes. However, as Fe 0 -Ni 0 nanoparticles supported in SiO 2 , they reduced the hexavalent content of a quantity of steel mass in relation to steel wool, considering that it consists only of metallic iron. The effectiveness in the most superficial part by the mass unit of the nanostructured particles is credited.

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Technologies for Remediation of Emerging Contaminants in Wastewater Samples

Horst

Somerset

2019

Nano and Bio‐Based Technologies for Wastewater Treatment

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Characterisation of silica-supported Fe–Ni bimetallic nanoparticles and kinetic study of reductive degradation of the drug nimesulide

Cited by 18 publications

References 46 publications

Synthesis of chitosan-stabilised bimetallic nanoparticles containing Fe and Ni and the reductive degradation of nimesulide

Synthesis of chitosan-stabilised bimetallic nanoparticles containing Fe and Ni and the reductive degradation of nimesulide

Síntese De Partículas Nanoestruturadas De Fe0-Ni0 /Si02 Para Redução Do Cromo Hexavalente Para Cromo Trivalente

Technologies for Remediation of Emerging Contaminants in Wastewater Samples

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