Journal ArticleDOI
Simultaneous electroanalytical determination of hydroquinone and catechol in the presence of resorcinol at an SiO2/C electrode spin-coated with a thin film of Nb2O5
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TLDR
The development, characterization and application of an Nb(2)O(5) film formed on the surface of a carbon ceramic material, SiO(2)/C, obtained by a sol-gel method, using the spin-coating technique shows high sensitivity in the simultaneous determination of hydroquinone and catechol in the presence of resorcinol.Abstract:
This paper describes the development, characterization and application of an Nb2O5 film formed on the surface of a carbon ceramic material, SiO2/C, obtained by a sol–gel method, using the spin-coating technique. The working electrode using this material will be designated as SiCNb. Hydroquinone and catechol can be oxidized at this electrode in the presence of resorcinol, allowing their simultaneous detection. The electrochemical properties of the resulting electrode were investigated using cyclic and differential pulse voltammetry techniques. Well-defined and separated oxidation peaks were observed by differential pulse voltammetry in Tris–HCl buffer solution at pH 7 containing 1 mol L−1 KCl in the supporting electrolyte solution. The SiCNb electrode exhibited high sensitivity in the simultaneous determination of hydroquinone and catechol in the presence of resorcinol, with the limits of detection for hydroquinone and catechol being 1.6 μmol L−1 and 0.8 μmol L−1, respectively. Theoretical calculations were performed to determine the ionization energies of hydroquinone, catechol and resorcinol; the results were used to explain the simultaneous determination of species by differential pulse voltammetry. The presence of resorcinol did not produce any interference in the simultaneous detection of hydroquinone and catechol on the surface of the modified electrode.read more
Citations
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A new electrochemical sensor based on Fe3O4 functionalized graphene oxide-gold nanoparticle composite film for simultaneous determination of catechol and hydroquinone
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Black nanostructured Nb2O5 with improved solar absorption and enhanced photoelectrochemical water splitting
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TL;DR: In this article, the authors reported the fabrication of black nanostructured Nb2O5 and its enhanced photoelectrochemical (PEC) properties for the first time, which achieved a relatively large photocurrent of 1.02 mA cm−2 and a high applied bias photon-to-current efficiency of 0.345%.
Journal ArticleDOI
Synthesis of a poly(N-methylthionine)/reduced graphene oxide nanocomposite for the detection of hydroquinone
Yinqiu Liu,Nan-nan Song,Zhen Ma,Kang Zhou,Zhengyang Gan,Yuhua Gao,Sheng Tang,Chuanxiang Chen +7 more
TL;DR: In this article, poly(N-methylthionine) (PNMTh) is prepared at a reduced graphene oxide (rGO) electrode in a strong acid solution using electrochemical polymerization, and the PNMTh/rGO nanocomposite acts as a novel electrochemical sensing material for highly sensitive detection of hydroquinone (HQ).
References
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Journal ArticleDOI
Electrochemical behavior of catechol, resorcinol and hydroquinone at graphene–chitosan composite film modified glassy carbon electrode and their simultaneous determination in water samples
Huanshun Yin,Qingming Zhang,Qingming Zhang,Yunlei Zhou,Qiang Ma,Tao Liu,Lusheng Zhu,Shiyun Ai +7 more
TL;DR: In this article, a modified glassy carbon electrode was used for the characterization of catalytic catalytic activities in a GCE and chitosan modified GCE, and the peak-to-peak potential separations between catechol (CT), resorcinol (RS) and hydroquinone (HQ) were obtained in their ternary mixture.
Journal ArticleDOI
Niobium-containing catalysts—the state of the art
TL;DR: Niobium oxides and mixed oxides as well as sulfides, nitrides (oxynitrides), carbides (oxycarbides), and phosphates are considered in this paper.