Various amine functionalized halloysite nanotube as efficient metal free catalysts for H 2 generation from sodium borohydride methanolysis

Şahiner, Nurettin; Sengel, Sultan Butun

doi:10.1016/j.clay.2017.07.008

Cited by 54 publications

(39 citation statements)

References 40 publications

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“…The modifications of CBs were carried out in an accord with the literature and with some modifications . The schematic representation of the oxidation and modification reaction of the CBs was presented in Figure A.…”

Section: Resultsmentioning

confidence: 99%

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Surface‐modified carbon black derived from used car tires as alternative, reusable, and regenerable catalysts for H ₂ release studies from sodium borohydride methanolysis

Ari

Sunol

et al. 2019

Int J Energy Res

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Summary Carbon black (CB) obtained from used car tire rubbers were treated with concentrated sulfuric and nitric acids. The oxidized CB (CB‐COO‐Na+) is subsequently modified with epichlorohydrin (ECH) and amines including polyethylene imine (PEI). These modified CBs such as CB‐PEI are used as metal‐free catalysts in methanolysis of sodium borohydride (NaBH4) to produce hydrogen. The hydrogen generation rate (HGR) of 3089 ± 44.69 mL.min‐1.g‐1 is accomplished at room temperature with CB‐PEI‐hydrochloric acid (HCl) catalyst. The resulting activation energy of 34.7 kJ/mol for the temperature range of −20°C to +30°C compares favorably to most of alternative catalysts reported in literature while reaction catalyzing capabilities of CB‐PEI‐HCl particles extend to the subzero temperature range (−20°C‐0°C). The reuse and regeneration studies conducted for the CB‐PEI‐HCl catalyst showed that these catalysts do provide complete conversion at every use up to five consecutive runs and retain 50 ± 2.5% of the original hydrogen generation rate at the fifth consecutive reuse. The CBs‐based catalysts are fully regenerated with HCl treatment.

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Section: Resultsmentioning

confidence: 99%

“…The corresponding reaction mechanism catalyzed by CB‐PEI‐HCl is demonstrated in Figure . It is apparent that the higher the number of protonated amine groups on the modified CB, the better the catalytic performances of the catalyst …”

Section: Resultsmentioning

confidence: 99%

Surface‐modified carbon black derived from used car tires as alternative, reusable, and regenerable catalysts for H ₂ release studies from sodium borohydride methanolysis

Ari

Sunol

et al. 2019

Int J Energy Res

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“…Here, polyamine, PEI‐modified, protonated and IL forms of HNTs were reported and their antimicrobial capabilities were investigated against a wide range of microorganisms. In the modification reaction, silanol (Si─OH) groups on the outer surface of HNTs were treated with NaOH to generate negatively charged surfaces that can easily react with epichlorohydrin (ECH) . So, using ECH as a linking agent for further modification of HNTs with branched amine groups containing PEI was accomplished.…”

Section: Resultsmentioning

confidence: 99%

“…The change in the morphology of HNTs after modification was visualized by scanning electron microscope (SEM) and transmission electron microscope (TEM). Earlier, PEI‐modified HNTs were reported as a potential material in gene delivery applications and catalysis reactions . Furthermore, materials modified to have positively charged surfaces have many biomedical applications.…”

Section: Introductionmentioning

confidence: 99%

Functionalization of halloysite nanotubes with polyethyleneimine and various ionic liquid forms with antimicrobial activity

Suner

Şahiner

Akçalı

et al. 2019

J of Applied Polymer Sci

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Halloysite nanotube (HNT), a natural clay, was modified with branched polyethyleneimine (PEI) to form PEI‐HNT using epichlorohydrin (ECH) as coupling agent, then protonated with HCl to obtain H‐PEI‐HNTs providing [NH3]+[Cl]− functionality for potential antimicrobial properties. Upon PEI modification, zeta potential value of HNTs was increased to +37.3 mV from −34.5 mV and to +41.1 mV for H‐PEI‐HNTs. Only 1.87 wt % H‐element in HNT was increased to 3.03 wt % upon PEI modification along with newly generated elements of N and C at 2.99 and 9.93 wt %, respectively. Moreover, ionic liquid (IL) forms of HNTs with [NH3]+[N(CN)2]−, [NH3]+[PF6]− and [NH3]+[BF4]− functionality were generated via anion exchange of H‐PEI‐HNTs with sodium dicyanamide (SDC), ammonium hexafluorophosphate (AHFP), and sodium tetrafluoroborate (STFB). The antimicrobial properties of the modified, protonated, and IL forms of HNTs were determined via macro dilution, diffusion and agar screening tests against Escherichia coli ATCC 8739, Pseudomonas aeruginosa ATCC 10145, Bacillus subtilis ATCC 6633, Staphylococcus aureus ATCC 6538 strains, and Candida albicans ATCC 10231 strains. It was found that H‐PEI‐HNTs possesses potent antimicrobial effect compared with the other forms of HNTs with 2–4 mg mL−1 MIC and 8–16 mg mL−1 MBC values via the macro dilution method. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020, 137, 48352.

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“…Generally, the rate of NaBH 4 methanolysis is much faster than its hydrolysis rate under the same conditions. As shown in Figure S6, for the methanolysis reactions at 20, 25, and 30 °C, it took 8.0, 4.8, and 2.8 min respectively to produce 259 mL H 2 , which were comparable with the results reported in previous studies …”

Section: Resultsmentioning

confidence: 99%

Protonated Poly(ethylene imine)‐Coated Silica Nanoparticles for Promoting Hydrogen Generation from the Hydrolysis of Sodium Borohydride

et al. 2019

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Nonmetal catalysts are attracting a great deal of attention because of their advantages including high activity, low cost, and environmental friendliness. In this work, a nonmetal catalyst for NaBH4 hydrolysis was fabricated through covalent modification of silica nanoparticles with protonated poly(ethylene imine). The successful formation of the catalyst was verified by transmission electron microscopy, thermogravimetric analysis, and Fourier transform infrared spectroscopy. The fabricated catalyst shows excellent activity in catalyzing NaBH4 hydrolysis reactions. The hydrolysis of 15 mg NaBH4 catalyzed by 50 mg catalyst could provide a hydrogen generation rate as high as 117.53 mL min−1 gcat-1 at 20 °C. Although the catalytic activity decreased after use, it could be restored easily by regenerating in acetic acid solution.

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Various amine functionalized halloysite nanotube as efficient metal free catalysts for H 2 generation from sodium borohydride methanolysis

Cited by 54 publications

References 40 publications

Surface‐modified carbon black derived from used car tires as alternative, reusable, and regenerable catalysts for H ₂ release studies from sodium borohydride methanolysis

Surface‐modified carbon black derived from used car tires as alternative, reusable, and regenerable catalysts for H ₂ release studies from sodium borohydride methanolysis

Functionalization of halloysite nanotubes with polyethyleneimine and various ionic liquid forms with antimicrobial activity

Protonated Poly(ethylene imine)‐Coated Silica Nanoparticles for Promoting Hydrogen Generation from the Hydrolysis of Sodium Borohydride

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Various amine functionalized halloysite nanotube as efficient metal free catalysts for H 2 generation from sodium borohydride methanolysis

Cited by 54 publications

References 40 publications

Surface‐modified carbon black derived from used car tires as alternative, reusable, and regenerable catalysts for H 2 release studies from sodium borohydride methanolysis

Surface‐modified carbon black derived from used car tires as alternative, reusable, and regenerable catalysts for H 2 release studies from sodium borohydride methanolysis

Functionalization of halloysite nanotubes with polyethyleneimine and various ionic liquid forms with antimicrobial activity

Protonated Poly(ethylene imine)‐Coated Silica Nanoparticles for Promoting Hydrogen Generation from the Hydrolysis of Sodium Borohydride

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Product

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About

Surface‐modified carbon black derived from used car tires as alternative, reusable, and regenerable catalysts for H ₂ release studies from sodium borohydride methanolysis

Surface‐modified carbon black derived from used car tires as alternative, reusable, and regenerable catalysts for H ₂ release studies from sodium borohydride methanolysis