Bentonite clay as an efficient substrate for the synthesis of the super stable and recoverable magnetic nanocomposite of palladium (Fe3O4/Bentonite-Pd)

Bananezhad, Behjat; Islami, Mohammad Reza; Ghonchepour, Ehsan; Mostafavi, Hamid; Tikdari, Ahmad Momeni; Rafiei, Hamid Reza

doi:10.1016/j.poly.2019.01.054

Cited by 41 publications

(20 citation statements)

References 47 publications

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“…The thermal stability of the bentonite supported tri-metallic catalyst was investigated using thermal gravimetric analysis (TGA) and differential scanning calorimetry (DSC) curves as presented in Figure 5. The TGA curve shows a weight reduction of 5 % (w/w) at a lower temperature of between 20 and 120 ℃ which can be attributed to the elimination of feasible impurities and desorption of physically absorbed water from the interlamellar region on the surface of bentonite and Fe-Co-Ni trimetallic compound [22]. Further weight loss of 5 % (w/w) was also observed in the temperature range of 120-700 ℃ which can be attributed to the removal of water from the dihydroxylation process [23].…”

Section: Characterization and Physicochemical Properties Of Biodieselmentioning

confidence: 96%

HETEROGENEOUS CATALYSIS USING BENTONITE-SUPPORTED Fe-Co-Ni TRIMETALLIC NANOPARTICLES

ALADE¹,

LATIFAT²,

ISHOLA³

et al. 2022

JESR

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Herein, the synthesis and characterization of a bentonite-supported Fe-Co-Ni trimetallic nanocatalyst applied in transesterification reaction was reported. The synthesized heterogeneous catalyst was used to investigate the production of biodiesel by varying the reaction parameters using Box-Behnken design response surface methodology (RSM-BBD). An optimum biodiesel yield of 95.2 % was obtained at methanol to oil ratio of 10:1, reaction time of 2 hours, reaction temperature of 55 and catalyst concentration of 5 % (w/w of the oil). The biodiesel produced was later analysed using GC-MS analysis and the results shows a fatty acid methyl esters (FAME) profile that confirms the presence of biodiesel.

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Section: Characterization and Physicochemical Properties Of Biodieselmentioning

confidence: 96%

HETEROGENEOUS CATALYSIS USING BENTONITE-SUPPORTED Fe-Co-Ni TRIMETALLIC NANOPARTICLES

ALADE¹,

LATIFAT²,

ISHOLA³

et al. 2022

JESR

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“…In another study, the synthesis of spherical, single‐phase magnetic Fe 3 O 4 /bentonite composite nanoparticles with a palladium loading of 1.4 wt% was reported . The support material was prepared by mixing FeCl 2 and FeCl 3 with bentonite followed by treatment with ammonia solution under nitrogen.…”

Section: Organic Synthesismentioning

confidence: 99%

Polydopamine – its Prolific Use as Catalyst and Support Material

Molnár

2020

ChemCatChem

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Polydopamine is a mussel-inspired functional material with a unique ability to form surface coatings. It is a green, environmentally benign product available very easily for a multitude of varied applications. This review attempts to collect useful information with respect to polydopamine-based catalytic studies with the use of polydopamine and modified polydopamine preparations loaded with varied catalytically active species including metal ions and metal particles. Major sections are about the use of polydopamine as catalyst material, utilization of immobilized enzymes, removal of toxic materials, results in organic synthesis, and fuel cell applications. A few examples of chiral catalysis and results of recycling studies are also treated. Data collected and analyzed indicate the importance and high potential of polydopamine-based catalysts in sustainable chemistry. of subunits attacked by an immobilized cyclohexeneamine (5) was suggested to be the transition state of CÀ C bond formation.Edouard et al. prepared catalyst 0.29 % PDA/PU by depositing PDA onto polyurethane foam (PU, 180 � 20 mg, 8 cm 3 ) and used it for the reduction of methylene blue (MB) with NaBH 4 . [48] Activities decreased gradually with repeated uses from 100 % to 35 % in run 11 but partial reactivation was achieved upon keeping the sample at 67°C for 8 h (55 % dropping below 10 % in run 13). Exposure to air at room temperature for six days proved to be somewhat more beneficial (90 % conversion in run 14 decreasing to 48 % in run 18). In a recent study they fabricated two oxidized PDA/PU samples and then loaded them with NaBH 4 . [49] One made by the usual method (dopamine/Tris, rt, 12 h, in air; sample PDA O2 PU), whereas the other was made by treating PU in a mixture of dopamine, NaOAc, and NaIO 4 (pH 5, rt, 24 h). The sample was dried (67°C) and washed thoroughly with water (PDA NaIO4 PU). Both products were dipped into an aqueous solution of NaBH 4 (0.1 M, 10 min) to afford boron contents of 2.37 and 2.11 wt%. The catalysts tested in the degradation of MB showed high activities with efficiencies of 97 % and 98 %, respectively (NaBH 4 /MB molar ratio 40, 177 mg and 209 mg catalysts, 25 min). During five reuses, the pH of the reaction medium increased because of boron loss (0.78 wt% and 0.81 wt%). The activity of PDA NaIO4 PU decreased to 89 % in run five. However, dipping the used sample into a 0.1 M NaBH 4 solution restored the original efficiency of 98 %. This, however, was only a temporary remedy, since a low efficiency of 60 % was measured in run 10. PDA was suggested by the authors to act as a redox mediator to prevent the hydrolysis/oxidation of immobilized borohydride.This formula (5) should be moved up and placed before the paragraph starting with "Edouard et al…"The Zuo group used PDA particles (avg. diameter 240 nm) to induce the reduction of MB and rhodamine B (RhB) with NaBH 4 . [50] Quinone moieties of PDA were assumed to channel electrons from NaBH 4 to the dyes. Indeed, PDA oxidized with NaIO 4 exhibited increased degradatio...

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“…These reported catalyst exhibited very good yield towards DHPMS/DHPMTHs with good reusability. Bentonite belongs to the family of smecitie which contains one octahedral sheet and two silica sheets (2 : 1 or tetrahedral‐octahedral‐tetrahedra (TOT) mineral) that form layer through van der waals force and has the general formula as R x (H 2 O) 4 {(Al 2‐x ,Mgx) 2 [(Si,Al) 4 O 10 ](OH) 2 }, R is the exchangeable cations of alkali and alkaline earth metals between layers [56–61] . Apart from this, it possesses both Lewis and Bronsted acidity, [56,62,63] thus it was explored as a heterogeneous catalyst in organic synthesis [62] .…”

Section: Introductionmentioning

confidence: 99%

“…Apart from this, it possesses both Lewis and Bronsted acidity, [56,62,63] thus it was explored as a heterogeneous catalyst in organic synthesis [62] . The other unique properties made it a favorable support for immobilization of metals nanoparticles, [57,59,64] metal oxides, [65,66] metal salts [56,60,63,67] and other modification of bentonite for various application [68–76] . Bentonite is widely distributed in the Kachchh region of India and mainly sodium and calcium bentonite are found in this area.…”

Section: Introductionmentioning

confidence: 99%

Fe(III)/Bentonite as a Heterogeneous Catalyst for the Synthesis of 3,4‐dihydropyrimidin‐2‐(1H)‐ones

Chopda

Dave

2020

ChemistrySelect

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Fe(III) immobilized over natural bentonite (bent) using the impregnation method. Prepared catalysts were well characterized by XRD, FT-IR and FeSEM. The catalytic activity of three catalysts 10, 20 and 30 % Fe(III)/bent evaluated for the synthesis of 3,4-dihydropyrimidin-2(1H)-ones known as Biginelli reaction. The catalyst 30 % Fe(III)/bent exhibited a high yield of the product towards the synthesis of a variety of dihydropyrimidones (DHPMs). The high yield of dihydropyrimidone (DHPM) was obtained in model reaction in ethanol, acetonitrile, DMF and solvent-free condition. The reusability test indicated that 6 % of yield of product decreased after 5 th cycle. Highlights * 10, 20 and 30 % Fe(III) were supported over bentonite clay. The catalysts are well characterized by (XRD), FT-IR, FeSEM and EDS. All charactization method showed that Fe supported over bentonite. * The used catalysts were screened for Biginelli reaction for synthesis dihydropyrimidones. * 30 % Fe(III)/bent exhibited high yield of product towards model Biginelli reaction between benzaldehyde, ethylacetoacetate and urea in ethanol. * 30 % Fe(III)/bent exhibited high yield of product in CH 3 CN, DMF and solvent free-condition. * The catalyst 30 % Fe(III)/bent applied for synthesis of variety of dihydropyrimodone in good yield in CH 3 CN. * Reusability studies show that no great decline in activity after 5 th cycle.

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Bentonite clay as an efficient substrate for the synthesis of the super stable and recoverable magnetic nanocomposite of palladium (Fe3O4/Bentonite-Pd)

Cited by 41 publications

References 47 publications

HETEROGENEOUS CATALYSIS USING BENTONITE-SUPPORTED Fe-Co-Ni TRIMETALLIC NANOPARTICLES

HETEROGENEOUS CATALYSIS USING BENTONITE-SUPPORTED Fe-Co-Ni TRIMETALLIC NANOPARTICLES

Polydopamine – its Prolific Use as Catalyst and Support Material

Fe(III)/Bentonite as a Heterogeneous Catalyst for the Synthesis of 3,4‐dihydropyrimidin‐2‐(1H)‐ones

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