Synthesis of Ag nanoparticles within the pores of SBA-15: An efficient catalyst for reduction of 4-nitrophenol

Naik, Bhanudas; Hazra, Subhenjit; Prasad, Virendra; Ghosh, Narendra Nath

doi:10.1016/j.catcom.2011.03.028

Cited by 199 publications

(103 citation statements)

References 21 publications

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“…Because of their higher surface area and greater active sites for interaction with pollutants, pore volume, adjustable pore diameter, easy surface modification, and excellent biocompatibility, these materials are useful in the field of adsorption and separation. Mesoporous silica nano-based composites with different porosity characteristics such as size, shape, and relationship between porosity and with different morphologies have been widely described in the literature [35,36]. Among this family of materials, MCM-41 and SBA-15 types of mesoporous silica containing one-and twodimensional cylindrical channels have mostly been studied.…”

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confidence: 99%

The removal of mercury (II) from water by Ag supported on nanomesoporous silica

2016

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In this study, the synthesis of SBA-15/Ag nanocomposite materials with different amounts of silver (2.5, 5, and 10 %) has been investigated under acidic conditions by using P123 as a template via the direct method. The nanocomposites of SBA-15 were synthesized by the same method and by the addition of silver salt. Finally, the nanocomposite materials were examined for the removal of mercury ions from wastewater as an adsorbent by the reverse titration method. Characterization was carried out through x-ray diffraction analysis (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and N 2 adsorption-desorption (Brunauer-EmmettTeller). XRD spectra confirmed the presence of silver nanoparticles within the amorphous silica matrix of SBA-15. The Barrett-Joyner-Halenda analysis showed that SBA-15 and SBA-15/Ag have a narrow pore size distribution. SEM images demonstrated that the morphology of the matrix of SBA-15 is in spherical state. Furthermore, wavelength dispersive x-ray spectroscopy identified the presence and distribution of silver nanoparticles inside the pore channels and outside of them. Typical TEM images of SBA-15 and SBA-15/Ag (5 wt.%) indicated a regular hexagonal pore structure with long-range order and long channels. In SBA-15/Ag (5 wt.%) sample, the nanoparticles of silver was found into the pores and outside of them. The removal of mercury ions from wastewater using mesoporous silica nanocomposite containing silver nanoparticles was studied by the reverse titration analysis. The best capacity of adsorption of mercury ions from wastewater was obtained for SBA-15/Ag (5 wt.%) sample, which was equal to 42.26 mg/g in 20 min at pH of 7. The Freundlich model was used to explain the adsorption characteristics for the heterogeneous surface, and K f (adsorption capacity) and n (adsorption intensity) were determined for Hg (II) ion adsorption on SBA-15/Ag nanocomposite materials with different amounts of silver (2.5, 5, and 10 %). The value of R 2 was about 0.99, 0.99, 0.98, and 0.98 and K f was about 42, 48, 58, and 58 mg/g for SBA-15/Ag, SBA-15/Ag (2.5 %), SBA-15/Ag (5 %), and SBA-15/Ag (10 %), respectively. Furthermore, the values of n >1 show a favorable adsorption process for Hg (II) ion adsorption on SBA-15/Ag nanocomposite materials. Moreover, the Langmuir isotherm model evaluation showed that the correlation coefficients for all concentrations were R 2 >0.99, indicating that Hg (II) ions were adsorbed on the surface of SBA-15/Ag via chemical and physical interaction. Additionally, the analytic hierarchy process (AHP) and Technique of Order Preference Similarity to the Ideal Solution (TOPSIS) methods that depend on the criteria of the surface area, amount of adsorbent, pore volume, and cost of synthesis were used. The evaluation of results showed that the best sample was SBA-15/Ag (5 wt.%). Furthermore, the research work highlighted the antibacterial nanocomposite with suitable adsorption of Hg (II) ions from water solutions and supported its potential for environme...

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The removal of mercury (II) from water by Ag supported on nanomesoporous silica

2016

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“…16,24,25 The rate of the catalytic reaction was higher in the case of AgNPs(2)/ZHL, which can be associated to the higher amount of AgNPs (Table 1). As observed by Naik et al, 26 the rate of catalytic reaction is affected by the concentration or loading level of the catalytically active site (here in this work due to the presence of AgNPs).…”

Section: Application Of Agnps(x)/zhl Hybrids As Catalysts For Reductimentioning

confidence: 50%

“…From these studies, it is clear that the catalytic performance of AgNPs(2)/ZHL hybrid (see TOF in Table 1) was superior to other Ag-containing inorganic (e.g., iron oxide, silica or graphene oxide) hybrid materials (Table 2). 10,[26][27][28][29][30][31] This can be attributed to the deposition of AgNPs on external surfaces of ZHL, which gives high accessibility of the substrates to the active sites. In addition to the higher activity of AgNPs/ZHL catalysts, the one-pot synthetic procedure is also an advantage, surface modification was not needed, and light-visible irradiation was used as a reducing agent of Ag + ions.…”

Section: Application Of Agnps(x)/zhl Hybrids As Catalysts For Reductimentioning

confidence: 99%

Ag Nanoparticles-Based Zinc Hydroxide-Layered Hybrids as Novel and Efficient Catalysts for Reduction of 4-Nitrophenol to 4-Aminophenol

Quites

Azevedo

Alves

et al. 2016

Journal of the Brazilian Chemical Society

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Silver nanoparticles and zinc hydroxide-layered hybrid materials (AgNPs/ZHL) have been successfully developed as efficient catalysts for the reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) with sodium borohydride. A facile and rapid visible-light assisted green route was used for the deposition of silver nanoparticles (AgNPs) on the external surface of ZHL material. The resulting AgNPs/ZHL hybrids contained AgNPs with spherical morphology and uniform size distribution. Moreover, the AgNPs/ZHL compounds exhibited excellent catalytic performance (the reduction reaction was finished within 4 min) and reusability (three cycles) toward the reduction of 4-NP to 4-AP in presence of sodium borohydride. The reduction reaction obeyed the pseudo-first-order kinetics. The rate constants increased with the increase of amount of the AgNPs deposited into the hybrid materials. These results suggest that the as-prepared catalysts (AgNPs/ZHL) have great potential for heterogeneous catalytic applications.

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“…A redução do 4-NP é completada em torno de 8 e 5 minutos para os catalisadores AuNPs(1)/FeOOH e AuNP(2)/ FeOOH, respectivamente. Estes resultados mostraram que o aumento das AuNPs acelera a redução do composto nitrofenólico, como já observado nos trabalhos de Naik e colaboradores, 37 que impregnaram NPs de prata nos canais de sílica mesoporosa do tipo SBA-15 para a redução de compostos nitrofenólicos. Nenhuma redução catalítica foi observada na presença apenas do suporte δ-FeOOH puro, indicando que a atividade catalítica pode ser atribuída exclusivamente as nanopartículas de ouro.…”

Section: Redução Catalítica Do 4-nitrofenol Pelos Híbridos Aunps/feoohunclassified

Novos híbridos baseados em oxihidróxido de ferro (III) e nanopartículas de ouro (AuNPs/FeOOH) como catalisadores para a redução de poluentes orgânicos ambientais

Azevedo¹,

Reis²,

Germino³

et al. 2017

Quim. Nova

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Synthesis of Ag nanoparticles within the pores of SBA-15: An efficient catalyst for reduction of 4-nitrophenol

Cited by 199 publications

References 21 publications

The removal of mercury (II) from water by Ag supported on nanomesoporous silica

The removal of mercury (II) from water by Ag supported on nanomesoporous silica

Ag Nanoparticles-Based Zinc Hydroxide-Layered Hybrids as Novel and Efficient Catalysts for Reduction of 4-Nitrophenol to 4-Aminophenol

Novos híbridos baseados em oxihidróxido de ferro (III) e nanopartículas de ouro (AuNPs/FeOOH) como catalisadores para a redução de poluentes orgânicos ambientais

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