Synthesis, characterisation and electrochemical evaluation of reduced graphene oxide modified antimony nanoparticles

Silwana, Bongiwe; Horst, Charlton van der; Iwuoha, Emmanuel I.; Somerset, Vernon

doi:10.1016/j.tsf.2015.09.010

Cited by 25 publications

(11 citation statements)

References 76 publications

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“…When GO is reduced, it is clearly shown that there are no peaks can be found at 1718 cm -1 which indicates the C=O groups have been eliminated. Figure 2(e) indicates that there is C-H asymmetric stretching vibration mode (2919 cm -1 ) when GO is reduced for 8 hours [24]. Supposedly, as GO is being reduced many of -OH groups have been reduced.…”

Section: Methodsmentioning

confidence: 98%

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Preparation and Characterization of Improved Hydrophilic Polyethersulfone/Reduced Graphene Oxide Membrane

Aziz¹,

Arifin²,

Lau³

2019

MJAS

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Polyethersulfone (PES)/reduced graphene oxide (rGO) membrane was prepared by phase inversion method for water treatment. Graphene oxide (GO) was obtained via modified Hummer's method and reduced to rGO where NaBH 4 was chosen as a reducing agent. FTIR was used to investigate functional groups left on rGO after reduction process. The FTIR peak at 1718 cm -1 , attributed to the carbonyl (C=O) group, was absent after GO was reduced. Interlayer spacing of GO and rGO were obtained using XRD. It was found that the interlayer spacing of GO was reduced from 7.87 to 3.68 Å after reduction process due to the removal of some of the functional groups from the material. The membrane cross section showed that addition rGO increase the length of finger-like pores as compared to neat PES when it is observed under SEM. It was observed that the membrane hydrophilicity is enhanced as the contact angle of PES reduced from 69.70 o to 32.99 o when rGO 24 hours was introduced into the polymer matrix. The highest pure water flux obtained was 174.29 L/m 2 h. The membranes showed significant enhancement when rGO was used in the polymer matrix. AbstrakMembran polietersufon (PES)/grafin oksida terturun (rGO) telah dihasilkan melalui kaedah fasa terbalik untuk rawatan air. Grafin oksida (GO) dihasilkan menerusi kaedah Hummer terubahsuai dan diturunkan kepada rGO menggunakan NaBH 4 sebagai ejen penurunan. FTIR digunakan untuk menyiasat kumpulan berfungsi yang hadir pada rGO selepas proses penurunan. Puncak FTIR pada 1718 cm -1 yang menunjukkan kumpulan karbonil (C=O) tidak hadir selepas GO terturun. Jarak antara lapisan GO dan rGO telah dikaji menggunakan XRD. Didapati jarak antara lapisan GO berkurang daripada 7.87 Å ke 3.68 Å selepas proses penurunan kerana sebilangan kumpulan berfungsi telah terkeluar dari bahan. Keratan rentas membran menunjukkan bahawa penambahan rGO meningkatkan panjang liang seperti jejari berbanding PES asli apabila dilihat menggunakan SEM. Didapati bahawa sifat hidrofilik membran telah dipertingkatkan kerana sudut sentuh air PES telah berkurang dari 69.70 o kepada 32.99 o apabila rGO 24 jam ditambah ke dalam matriks polimer. Bacaan fluks air tulen tertinggi ialah 174.29 L/m 2 h. Membran menunjukkan perubahan ketara apabila rGO digunakan di dalam matriks polimer.

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Section: Methodsmentioning

confidence: 98%

“…Overall, peak in the range of 1300 -1450 cm -1 indicates tertiary alcohol bending [22]. Meanwhile, peak around 1636 -2655 cm -1 shows the deformation vibration of -OH groups [24]. where is the wavelength of the X-ray beam, d is the interlayer spacing, and θ is the diffraction angle.…”

Section: Methodsmentioning

confidence: 99%

Preparation and Characterization of Improved Hydrophilic Polyethersulfone/Reduced Graphene Oxide Membrane

Aziz¹,

Arifin²,

Lau³

2019

MJAS

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“…The electrode was modified by the drop-cast method (Adekunle et al, 2011a ; Silwana et al, 2015 ). GCE surface was cleaned first by a gentle polish with 0.3 μm alumina slurries on a polishing pad followed by a gentle rinse with distilled water.…”

Section: Methodsmentioning

confidence: 99%

Electrocatalysis of Lindane Using Antimony Oxide Nanoparticles Based-SWCNT/PANI Nanocomposites

et al. 2018

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This work describes the chemical synthesis of antimony oxide nanoparticles (AONPs), polyaniline (PANI), acid functionalized single-walled carbon nanotubes (fSWCNTs), and the nanocomposite (AONP-PANI-SWCNT) as catalyst for the trace detection of lindane. Successful synthesis of the nanomaterials was confirmed by Fourier transform infrared (FT-IR) spectroscopy, ultraviolet-visible (UV-Vis) spectroscopy, x-ray diffraction (XRD) spectroscopy, and scanning electron microscopy (SEM). Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) were used for investigating the electrochemical behavior of the modified electrodes in the ferrocyanide/ferricyanide ([Fe(CN)6]4−/[Fe(CN)6]3−) redox probe. GCE-AONP-PANI-SWCNT exhibited faster electron transport properties as well as higher electroactivity as compared to bare-GCE, GCE-AONPs, GCE-PANI, and GCE-SWCNT electrodes. Electrocatalytic studies further showed that GCE-AONP-PANI-SWCNT modified electrode was stable (after 20 scans) with only a small current drop in lindane (0.57%). The GCE-AONP-PANI-SWCNT electrode with low detection limit of 2.01 nM performed better toward the detection of lindane as compared to other studies in literature. The GCE-AONP-PANI-SWCNT electrode is highly selective toward the detection of lindane in the presence of various organic and inorganic interfering species. Real sample analysis of river water and tap water samples using the developed sensor gave satisfactory percentage recoveries therefore confirming the potential of the proposed sensor for practical application.

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“…A 5 µL aliquot of this dispersion was dropped onto the GC electrode surface and left to dry overnight. After modification the surface of the electrode was carefully washed with distilled water and was ready for sensor application .…”

Section: Methodsmentioning

confidence: 99%

“…In our previous study, we synthesized a nanocomposite of rGO‐SbNPs and explored the possibility of detecting only Pt(II) at first, which was extended in the current study. In this paper, we focused on the optimisation of the parameters of a reduced graphene oxide‐antimony nanoparticles (GCE/rGO‐SbNPs) sensor for the detection of PGMs (Pd(II), Pt(II) and Rh(III) in the environmental samples.…”

Section: Introductionmentioning

confidence: 99%

Reduced Graphene Oxide Impregnated Antimony Nanoparticle Sensor for Electroanalysis of Platinum Group Metals

et al. 2016

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A very sensitive electrochemical sensor based on a reduced graphene oxide film impregnated with antimony nanoparticles was prepared and applied to the electroanalysis of platinum group metal ions of Pd(II), Pt(II) and Rh(III). The electrochemical behavior of platinum group metals at the modified electrode was studied by adsorptive differential pulse cathodic stripping voltammetry in the presence of dimethylglyoxime as chelating agent. Several operational parameters were optimised to enhance the electroanalytical performance of the modified glassy carbon electrode sensor. The results showed sharp stripping peaks and a relatively constant peak potential with a good linear behaviour in the examined concentration range from 40 to 400 pg L−1 for all metal ions investigated. The detection limit was found to be 0.45, 0.49 and 0.49 pg L−1 (S/N=3) for Pd(II), Pt(II) and Rh(III), respectively. The developed electrochemical sensor also exhibited good precision with a relative standard deviation of 4.2 %, 2.55 % and 2.67 % for 5 successive measurements for Pd(II), Pt(II) and Rh(III), respectively. The proposed nanostructure showed good sensitivity and stability, which has promising potential applications in electrochemical sensors.

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Synthesis, characterisation and electrochemical evaluation of reduced graphene oxide modified antimony nanoparticles

Cited by 25 publications

References 76 publications

Preparation and Characterization of Improved Hydrophilic Polyethersulfone/Reduced Graphene Oxide Membrane

Preparation and Characterization of Improved Hydrophilic Polyethersulfone/Reduced Graphene Oxide Membrane

Electrocatalysis of Lindane Using Antimony Oxide Nanoparticles Based-SWCNT/PANI Nanocomposites

Reduced Graphene Oxide Impregnated Antimony Nanoparticle Sensor for Electroanalysis of Platinum Group Metals

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