Three-dimensional carbon nanofiber derived from bacterial cellulose for use in a Nafion matrix on a glassy carbon electrode for simultaneous voltammetric determination of trace levels of Cd(II) and Pb(II)
Carbon nanofibers were prepared by one-step carbonization of bacterial cellulose and used to detect Cd(II) and Pb(II). The detection limits are 0.38 μg·L−1 for Cd(II) and 0.33 μg·L−1 for Pb(II), respectively. The work was developed as a collaboration with Prof. Hu and Prod. Mamat (China). The results are published in the journal of Microchimica Acta.
Danfeng Qin, Shanshuang Gao, Le Wang, Hangjia Shen, Nuerbiya Yalikun, Parviz Sukhrobov, Thomas Wågberg, Yujie Zhao, Xamxikamar Mamat, Guangzhi Hu.
Microchimica Acta, 184, 2759–2766 (2017)
The authors describe the preparation of carbon nanofibers (CNFs) with a three-dimensional network structure by one-step carbonization of bacterial cellulose at 800 °C. The 3D CNFs wrapped with Nafion polymer were cast on a glassy carbon electrode (GCE) which then enables sensitive detection of Cd(II) and Pb(II). Under optimized conditions and at typical stripping peaks of around −0.80 and −0.55 V (vs Ag/AgCl), the electrode exhibits high sensitivity and a wide analytical range of 2–100 μg·L−1 for both Cd(II) and Pb(II). The detection limits are 0.38 μg·L−1 for Cd(II) and 0.33 μg·L−1 for Pb(II), respectively. The modified GCE was successfully employed to the determination of trace amounts of Cd(II) and Pb(II) in both tap water and waste water.
Photocatalytic reduction of CO2 with H2O over modified TiO2 nanofibers: Understanding the reduction pathway
The photocatalytic performance of nanosized metal (Pt or Pd)-decorated TiO2 nanofibers (NFs) with CdSe quantum dots were tested for activation and reduction of CO2 under UV-B light. The CO2 photoreduction mechanism is proposed to take place via a hydrogenation pathway from first principles calculations. This work was performed in collaboration with the University of Oulu and the Åbo Akademi University, the manuscript is published in the journal of Nano Research.
Anjana Sarkar, Eduardo Gracia-Espino, Thomas Wågberg, Andrey Shchukarev, Melinda Mohl, Anne-Riikka Rautio, Olli Pitkänen, Tiva Sharifi, Krisztian Kordas, Jyri-Pekka Mikkola.
Nano Research, 2016 DOI:10.1007/s12274-016-1087-9
Nanosized metal (Pt or Pd)-decorated TiO2 nanofibers (NFs) were synthesized by a wet impregnation method. CdSe quantum dots (QDs) were then anchored onto the metal-decorated TiO2 NFs. The photocatalytic performance of these catalysts was tested for activation and reduction of CO2 under UV-B light. Gas chromatographic analysis indicated the formation of methanol, formic acid, and methyl formate as the primary products. In the absence of CdSe QDs, Pd-decorated TiO2 NFs were found to exhibit enhanced performance compared to Pt-decorated TiO2 NFs for methanol production. However, in the presence of CdSe, Pt-decorated TiO2 NFs exhibited higher selectivity for methanol, typically producing ∼90 ppmg−1·h−1 methanol. The CO2 photoreduction mechanism is proposed to take place via a hydrogenation pathway from first principles calculations, which complement the experimental observations.
Nano for Energy group
Comprehensive Study of an Earth-Abundant Bifunctional 3D Electrode for Efficient Water Electrolysis in Alkaline Medium.
ACS Appl. Mater. Interfaces, 2015, 7, 28148
C60/Collapsed Carbon Nanotube Hybrids - A Variant of Peapods.
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Sn/Be Sequentially co-doped Hematite Photoanodes for Enhanced Photoelectrochemical Water Oxidation: Effect of Be2+ as co-dopant.
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Atomistic understanding of the origin of high oxygen reduction electrocatalytic activity of cuboctahedral Pt3Co–Pt core–shell nanoparticles.
Catal. Sci. Technol., 2016, 6, 1393-1401
Photocatalytic reduction of CO2 with H2O over modified TiO2 nanofibers: Understanding the reduction pathway.
Nano Res. (2016) 9: 1956.