Green mediated synthesis of palladium nanoparticles using aqueous leaf extract of Gymnema sylvestre for catalytic reduction of Cr (VI)

Kadam, J.; Madiwale, S.; Bashte, B.; Dindorkar, Shreyas S.; Dhawal, Pranjali; More, Paresh

doi:10.1007/s42452-020-03663-5

Cited by 30 publications

(7 citation statements)

References 50 publications

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“…The fine powder leaves (about 5 g) were taken in a 250 mL beaker, mixed with 50 mL of deionized water, and heated at 80 ℃ for 20 minutes. Then, the mixture was filtered in another beaker with Whatman no.1 filter paper and the extract was formed in this stage according to literature [47,[58][59][60]. The extract was then cooled down and stored in the refrigerator (4 ℃) for utilization in the synthesis of ZnO NPs, as demonstrated in Fig.…”

Section: Preparation Of Leaf Extractmentioning

confidence: 99%

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Green synthesis of ZnO nanoparticles usingCocos nuciferaleaf extract: Characterization, antimicrobial, antioxidant, and photocatalytic activity

Rahman

Patwary

Siddique

et al. 2022

Preprint

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Zinc oxide nanoparticles (ZnO NPs) have been successfully prepared using Cocos nucifera leaf extract and investigated with their antimicrobial, antioxidant, and photocatalytic activity. The structural, compositional, and morphological properties of the NPs were recorded and studied systematically to confirm the synthesis. The aqueous suspension of NPs showed a UV-Vis. absorption maxima of 370 nm indicating primarily its formation. The XRD analysis identified the NPs with hexagonal wurtzite structure with an average particle size of 16.6 nm. The FTIR analysis identified some biomolecules and functional groups in the leaf extract as responsible for the encapsulation and stabilization of ZnO NPs. The EDX analysis showed the desired elemental compositions in the material. A flower-shaped morphology of ZnO NPs was observed by SEM with a grain size of around 15 nm. The optical properties of the NPs were studied by UV-Vis spectroscopy and the band gap was calculated as 3.37 eV. The prepared ZnO NPs have demonstrated antimicrobial activity against T. harzianum and S. aureus with a ZOI (zone of inhibition) of 14 and 10 mm, respectively. The photocatalytic behavior of ZnO NPs showed absorbance degradation at around 640 nm and discolored methylene blue dye after one hour with a degradation maximum of 84.29 %. Thus, the prepared ZnO NPs could be used potentially in antibiotic development, pharmaceutical industries, and as photocatalysts.

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Section: Preparation Of Leaf Extractmentioning

confidence: 99%

“…For the preparation of ZnO NPs, 25 mL of 0.05 M aqueous solution of Zn(NO3)2.6H2O was mixed with 4 mL of the prepared aqueous leaf extract of Cocos nucifera in a 250 mL beaker as demonstrated in Fig. 1 [47,[58][59][60]. Then, the pH of the mixture was adjusted to 12 by the drop-wise addition of 0.02 M aqueous NaOH solution.…”

Section: Preparation Of Zno Npsmentioning

confidence: 99%

Green synthesis of ZnO nanoparticles usingCocos nuciferaleaf extract: Characterization, antimicrobial, antioxidant, and photocatalytic activity

Rahman

Patwary

Siddique

et al. 2022

Preprint

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“…Apart from the intense peak of CNTs, the spectrum shows the existence of Pd and Ag which further confirm their incorporation onto the CNTs. Notably, some additional reflections indexed as (X) at 2ϴ values of 21.6 o and 32.1 o possibly belong to carbonaceous material in the plant extract employed in the biochemical synthesis of palladium and silver nanoparticles [49] . A shift in the diffraction peaks was observed between MWCNTs and Pd-Ag-CNTs based on ionic radius interstitial substitution effect of Ag and Pd ion on graphitic carbon.…”

Section: Hrtem and Saed Patterns Of Pd-ag-cnts Nanocompositementioning

confidence: 99%

Enhanced Adsorption of Cu(II) and Ni(II) ions from animal feeds processing industry wastewater by Reusable Mesoporous Palladium-Silver-Carbon nanotubes Composite

Tijani

Usman

Abdulkareem

et al. 2022

Preprint

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This study focused on the development of a novel Palladium (Pd)-Silver (Ag)-Carbon nanotubes adsorbent for the removal of Cu(II) and Ni(II) ions in industrial animal feed processing wastewater. Carbon nanotubes (CNTs) were produced via a catalytic chemical vapour deposition (CCVD) method and then purified by acid mixture of H2SO4 and HNO3. Pd-Ag-CNTs nanocomposites were produced through a combination of ultrasonic-assisted wet impregnation methods. Different analytical tools such as HRSEM, HRTEM, EDS, SAED, XRD and BET were used to characterize the prepared nanoadsorbent. The HRSEM analysis revealed homogeneous dispersion of Pd and Ag nanoparticles on the CNTs matrix. XRD pattern confirmed formation of graphitic face-centered cubic structure with or without metal matrix nanoparticles with an average crystallite sizes of 26.10 nm (Pd-Ag-CNTs) > 13.00 nm (Pure-CNTs). BET analysis showed that simultaneous addition of Pd and Ag nanoparticles onto CNTs contributed to enhanced surface area of (392.5 m2/g) compared to Pure-CNTs (227.63 m2/g). The effect of contact time, adsorbent dosage, and temperature on the nanoadsorbent efficacy with respect to Cu(II) and Ni(II) ions removal were investigated via batch adsorption mode. The optimum condition for the maximum removal of Ni(II) ions (99.84%) and Cu(II) ions (77.86%) by Pd-Ag-CNTs were contact time (90 min), adsorbent dosage (60 mg)and reaction temperature (60°C). The adsorption isotherm data best fitted Florry-Huggins model based on the χ2, SSE and regression co-efficient values of 0.9947 (Cu) and 0.7098 (Ni), while the kinetic data suited pseudo-second order. The thermodynamic study was found to be non-spontaneous and endothermic in nature. This study demonstrated for the first time that Pd-Ag-CNTs exhibited exceptional adsorptive and recyclability properties for the removal of Cu(II) and Ni(II) ions from industrial animal feed processing wastewater even after five cycles.

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“…The XRD diffractograms of these samples are shown in 225)) (Khan et al, 2014). On the other hand, the diffractograms of both HRG-Pd and HRG-Py-Pd consist of a broad reflection at 2θ = 22.4 °corresponding to the HRG in addition to the reflections belonging to the face-centered cubic (fcc) structure of Pd NPs (Khan et al, 2014;Kadam et al, 2020). This indicates the formation of HRG and Pd-based nanocomposites to produce HRG-Pd and HRG-Py-Pd nanocatalysts.…”

Section: Xrd Analysismentioning

confidence: 99%

Pyrene Functionalized Highly Reduced Graphene Oxide-palladium Nanocomposite: A Novel Catalyst for the Mizoroki-Heck Reaction in Water

et al. 2022

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The formation of a C-C bond through Mizoroki-Heck cross-coupling reactions in water with efficient heterogeneous catalysts is a challenging task. In this current study, a highly reduced graphene oxide (HRG) immobilized palladium (Pd) nanoparticle based catalyst (HRG-Py-Pd) is used to catalyze Mizoroki-Heck cross-coupling reactions in water. During the preparation of the catalyst, amino pyrene is used as a smart functionalizing ligand, which offered chemically specific binding sites for the effective and homogeneous nucleation of Pd NPs on the surface of HRG, which significantly enhanced the physical stability and dispersibility of the resulting catalyst in an aqueous medium. Microscopic analysis of the catalyst revealed a uniform distribution of ultrafine Pd NPs on a solid support. The catalytic properties of HRG-Py-Pd are tested towards the Mizoroki-Heck cross-coupling reactions of various aryl halides with acrylic acid in an aqueous medium. Furthermore, the catalytic efficacy of HRG-Py-Pd is also compared with its non-functionalized counterparts such as HRG-Pd and pristine Pd NPs (Pd-NPs). Using the HRG-Py-Pd nanocatalyst, the highest conversion of 99% is achieved in the coupling reaction of 4-bromoanisol and acrylic acid in an aqueous solution in a relatively short period of time (3 h), with less quantity of catalyst (3 mg). Comparatively, pristine Pd NPs delivered lower conversion (∼92%) for the same reaction required a long reaction time and a large amount of catalyst (5.3 mg). Indeed, the conversion of the reaction further decreased to just 40% when 3 mg of Pd-NPs was used which was sufficient to produce 99% conversion in the case of HRG-Py-Pd. On the other hand, HRG-Pd did not deliver any conversion and was ineffective even after using a high amount of catalyst and a longer reaction time. The inability of the HRG-Pd to promote coupling reactions can be attributed to the agglomeration of Pd NPs which reduced the dispersion quality of the catalyst in water. Therefore, the high aqueous stability of HRG-Py-Pd due to smart functionalization can be utilized to perform other organic transformations in water which was otherwise not possible.

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Green mediated synthesis of palladium nanoparticles using aqueous leaf extract of Gymnema sylvestre for catalytic reduction of Cr (VI)

Cited by 30 publications

References 50 publications

Green synthesis of ZnO nanoparticles usingCocos nuciferaleaf extract: Characterization, antimicrobial, antioxidant, and photocatalytic activity

Green synthesis of ZnO nanoparticles usingCocos nuciferaleaf extract: Characterization, antimicrobial, antioxidant, and photocatalytic activity

Enhanced Adsorption of Cu(II) and Ni(II) ions from animal feeds processing industry wastewater by Reusable Mesoporous Palladium-Silver-Carbon nanotubes Composite

Pyrene Functionalized Highly Reduced Graphene Oxide-palladium Nanocomposite: A Novel Catalyst for the Mizoroki-Heck Reaction in Water

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