Synthesis, Spectroscopic, Surface and Catalytic Reactivity of Chitosan Supported Co(II) and Its Zerovalentcobalt Nanobiocomposite

Adewuyi, Sheriff; Bisiriyu, Ibraheem Olayiwola; Akinremi, Caroline A.; Amolegbe, Saliu Alao

doi:10.1007/s10904-016-0452-1

Cited by 20 publications

(14 citation statements)

References 22 publications

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“…The surface morphology of the samples was confirmed using Tescan Vega 3 LMH Scanning electron microscopy (SEM). The polymerization of vinyl acetate was carried out as previously reported [48] [49] [50]. The vinyl polymer obtained was analyzed using Bruker Avance III HD (500 MHz equipped with Bbi probe) NMR spectrometer with the same FT-IR spectrometer and UV-visible spectrometer used to characterize the coordination biopolymer.…”

Section: Materials and Instrumentationsmentioning

confidence: 99%

“…Using the coordination biopolymers [Chit-Co(II), Chit-Ni(II), Chit-Mn(II), and Chit-Fe(III)] prepared as catalysts, vinyl acetate polymerization was carried out using the previous method [50] [51]. In a typical experiment, 0.01 g of the catalysts were added separately into a vial containing a biphasic mixture of 1 ml vinyl acetate monomer and 1 ml Na2SO3 aqueous solution (figure 1).…”

Section: Polymerization Of Vinyl Acetatementioning

confidence: 99%

“…To date, the detailed reports on the use of chitosan-metal catalysts for vinyl acetate polymerization are limited. Chitosan-Co(II) [49] [50] and chitosan-Zn(II) [51] have recently been investigated for vinyl acetate polymerization. However, cobalt has been found to be more effective than zinc [49] [50] [51].…”

Section: Introductionmentioning

confidence: 99%

“…Chitosan-Co(II) [49] [50] and chitosan-Zn(II) [51] have recently been investigated for vinyl acetate polymerization. However, cobalt has been found to be more effective than zinc [49] [50] [51]. Due to the high cost of the second row, third row, and the late transition elements, this study has been geared towards the effect of some first-row transition metals (Ni, Mn, Co, and Fe) on vinyl acetate polymerization with insight into the possible reaction mechanism.…”

Section: Introductionmentioning

confidence: 99%

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Chitosan-Transition Metal Coordination Biopolymer: A Promising Heterogeneous Catalyst for Radical Ion Polymerization of Vinyl Acetate at Ambient Temperature.

Bisiriyu

Meijboom²

2021

Preprint

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The present study utilized chitosan obtained from crab shell and transition metal salts as precursors to synthesize chitosan-metal coordination biopolymers of Mn(II), Fe(III), Co(II) and Ni(II) [i.e Chit-Mn(II), Chit-Fe(III), Chit-Co(II) and Chit-NI(II) respectively]. The synthesized coordination biopolymers have been characterized using different instrumental techniques such as spectroscopic (UV-visible, FT-IR, XRD, EDS, and ICP-OES), thermal analysis (TGA and DTA), surface analysis (SEM), and hydrogen-temperature programmed reduction (H2-TPR) analysis. Spectroscopic studies confirmed the successful incorporation of the metals into the biopolymer matrix. Thermal analysis and H2-TPR revealed the reducibility of the Chit-Fe(III) at 120 ℃. While Chit-Fe(III) and Chit-Ni(II) were inactive, Chit-Co(II) and Chit-Mn(II) were found to be active towards vinyl acetate polymerization in the presence of aqueous Na2SO3. Furthermore, the polyvinyl acetate (PVAc) produced from Chit-Co(II) compared perfectly with a commercial PVAc and was in higher yield than PVAc produced from Chit-Mn(II). The polymerization has been shown to proceed via surface-initiated atom transfer radical polymerization (SI-ATRP), and the viscosity average molecular weight of PVAc produced has been measured as 25, 078. The density functional theory approach has been used to ascertain the coordination orientation of the Chit-Co(II) and explain its high efficiency towards vinyl acetate polymerization. The catalyst reusability test revealed an insignificant loss of activity for the Chit-Co(II) after seven cycles of polymerization. Kinetic studies show that the vinyl acetate polymerization suits the second-order kinetic model at ambient temperature. Thermodynamic studies also revealed that chain initiation is an endothermic process while chain propagation is an exothermic process. The result of this work also suggests an investigation of chitosan-metal coordination biopolymer via low-ppm ATRP approach for possible biomedical application.

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Section: Materials and Instrumentationsmentioning

confidence: 99%

Section: Polymerization Of Vinyl Acetatementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Chitosan-Transition Metal Coordination Biopolymer: A Promising Heterogeneous Catalyst for Radical Ion Polymerization of Vinyl Acetate at Ambient Temperature.

Bisiriyu

Meijboom²

2021

Preprint

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“…Electrospun nano bers afford wide varieties of applications due to its' 3-dimensional well assembled long length; positioning and orientation, as desired [18]. Also, nanosized bres are entrenched with an increased surface area [19], and reactivity, [20] especially providing more porous spongy material for improved chemical reactivity [21]. It has been established that nanoporous hybrid materials are highly e cient sorbents and their interfacial chemistry can be ne-tuned to selectively sequester any speci c target species [22].…”

Section: Introductionmentioning

confidence: 99%

Ester-Functionalised Ferrocene based Polyvinylbenzyl Chloride Nanofibre as a Decyanidating Agent

Adesoji

Shotonwa

Tshentu

et al. 2022

Preprint

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Diazotization-esterification mechanism was employed to synthesize 1-(2-pyridylazo)-2-naphthyl-bis(ƞ5-cyclopentadienyl)ironcarboxylate, FePNCp, [Fe(C5H5)(C5H4CO2C15H10N3)] which was further embedded on synthesized electrospun polyvinylbenzylchloride (ePVBC) to form a functionalized nanofibre composite of poly(ferrocenyl-l-(2-pyridylazo)-2-naphthylvinylbenzylchloride, (FePNCp-PVBC). FePNCp and ePVBC were characterized using spectroscopic (1H NMR, FT-IR, GC/MS, UV-vis) and scanning electronic microscopic techniques. The polymeric solution of PVBC was pumped via a spinneret at a flow rate of 1.2 mL/h with an applied 30 kV for nanofibres collection. The morphology of the functionalized nanofibre showed smooth fibrous and porous assembled structure with average particle size of 19.92 nm. Owing to the intrinsic properties of the newly produced material, it was applied in the entrapping of cyanide ions from an aqueous medium. Using a sorbent dosage of 0.01g in 8 mg/L CN− concentration, 92.2% decyanidation capacity was observed within 45 minutes for FePNCp-PVBC while 65.83% was obtained for the unfunctionalized ePVBC. The obvious improvement recorded by FePNCp-PVBC for the entrapment of CN− ions could be attributed to coordinative interaction between ferrocenyl molecule and cyanide ligand. By comparing with similar nanofibre materials, this new FePNCp-PVBC gave higher performance efficiency, thus could serve as a better alternative to cyanide detoxification.

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Design of Nano-Chitosans for Tissue Engineering and Molecular Release

Adewuyi

Cruz‐Maya

Ejeromedoghene

et al. 2019

Sustainable Agriculture Reviews 36

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Synthesis, Spectroscopic, Surface and Catalytic Reactivity of Chitosan Supported Co(II) and Its Zerovalentcobalt Nanobiocomposite

Cited by 20 publications

References 22 publications

Chitosan-Transition Metal Coordination Biopolymer: A Promising Heterogeneous Catalyst for Radical Ion Polymerization of Vinyl Acetate at Ambient Temperature.

Chitosan-Transition Metal Coordination Biopolymer: A Promising Heterogeneous Catalyst for Radical Ion Polymerization of Vinyl Acetate at Ambient Temperature.

Ester-Functionalised Ferrocene based Polyvinylbenzyl Chloride Nanofibre as a Decyanidating Agent

Design of Nano-Chitosans for Tissue Engineering and Molecular Release

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