39 research outputs found
Electrocatalytic reduction of trace nitrobenzene using a graphene-oxide@polymerized-manganese-porphyrin composite
Novel Bifunctional Electrocatalyst for ORR Activity and Methyl Parathion Detection Based on Reduced Graphene Oxide/Palladium Tetraphenylporphyrin Nanocomposite
We
introduce a facile, eco-friendly reduced graphene oxide/palladium
tetraphenylporphyrin (RGO/PdāTPP) nanocomposite for oxygen
reduction reaction (ORR) and environmental pollutant detection. The
catalytic properties of RGO/PdāTPP toward ORR and methyl parathion
(MP) reduction showed excellent performance due to the synergism between
RGO and PdāTPP. The other properties of RGO/PdāTPP nanocomposite
were characterized by various microscopic and spectroscopic techniques.
The as-prepared RGO/PdāTPP electrocatalyst was further fabricated
on electrode to study the ORR activity and MP sensing. The RGO/PdāTPP
modified electrode shows higher current density and less methanol
tolerance than the Pt/C electrode, which revealed that the proposed
material can be used as an excellent alternative to commercial Pt/C
electrode. In addition, the electrocatalytic reduction of MP on RGO/PdāTPP/GCE
was briefly investigated and achieved a good analytical performance
with excellent linear range (0.1ā125 Ī¼M), low detection
limit (7.4 nM), and higher sensitivity (4.1084 Ī¼A Ī¼M<sup>ā1</sup> cm<sup>ā2</sup>). Besides, the modified electrode
has successfully applied for the determination of MP insecticide in
various water and food samples. Therefore, the finding of RGO/PdāTPP
nanocomposite can be regarded as an effective catalyst to enhance
the electrocatalytic activity toward ORR and MP reduction
Innovative Strategy Based on a Novel Carbon-BlackāĪ²-Cyclodextrin Nanocomposite for the Simultaneous Determination of the Anticancer Drug Flutamide and the Environmental Pollutant 4āNitrophenol
In
the present work, a noncovalent and eco-friendly approach was
proposed to prepare a carbon-black/Ī²-cyclodextrin (CB/Ī²-CD)
nanocomposite. CB/Ī²-CD-nanocomposite-modified screen-printed
carbon electrodes were applied for the simultaneous determination
of the anticancer drug flutamide (Flut) and the environmental pollutant
4-nitrophenol (4-NP). The electrochemical performance of the proposed
sensor relied on the conductivity of CB, the different binding strengths
of the guests (Flut and 4-NP) to the host (Ī²-CD), and the different
reduction potentials of the nitroaromatic compounds. Fascinatingly,
the proposed sensor exhibited an excellent electrochemical performance
with high sensitivity, selectivity, and reproducibility. The obtained
wide linear ranges were 0.05ā158.3 and 0.125ā225.8 Ī¼M
for Flut and 4-NP. The low detection limits of 0.016 and 0.040 Ī¼M
with the higher sensitivities of 5.476 and 9.168 Ī¼A Ī¼M<sup>ā1</sup> cm<sup>ā2</sup> were achieved for the determination
of Flut and 4-NP, respectively. The practical feasibility of the proposed
sensor was studied in tap-water and human-serum samples