期刊
ADVANCES IN NATURAL SCIENCES-NANOSCIENCE AND NANOTECHNOLOGY
卷 10, 期 2, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/2043-6254/ab23fb
关键词
hydrogen production; hydrolysis; sodium borohydride; cobalt nanoparticles (CoNPs); starch hydrogel support
资金
- Thailand Research Fund (TRF) [TRG5680049]
- Center of Excellent for Innovation in Chemistry (PERCH-CIC)
- Office of the Higher Education Commission (OHEC), Ministry of Education
- Faculty of Science, Ubon Ratchathani University (UBU)
In this work, starch hydrogel was successfully prepared using a citric acid cross-linking method and then was utilized in the preparation of starch hydrogel-loaded cobalt nanoparticles (CoNPs) by the reduction of Co2+ ions loaded within the starch hydrogel network. The swelling behavior of starch hydrogel as a function of temperature and pH was also investigated. The resulting hydrogel-loaded CoNPs were confirmed using a number of techniques including powder x-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, transmission electron microscopy (TEM), selected area electron diffraction (SAED) and thermogravimetric analysis (TGA). The activity of starch hydrogel-loaded CoNPs was evaluated by employing them as a catalyst for the hydrogen production from the hydrolysis of sodium borohydride (NaBH4). The activation energy (E-a) was 52.18 kJ mol(-1); whereas, the activation enthalpy (Delta H-#) and activation entropy (Delta S-#) were 49.54 kJ mol(-1) and -138.61 kJ mol(-1), respectively. The activity of starch hydrogel-loaded CoNPs maintained over the 5 cycles of utilization. Due to its biocompatibility, flexibility and nontoxicity, starch hydrogel could be considered as a promising candidate to be used as a template for the preparation of metal nanoparticles in the hydrogen production and even in catalysis of other reactions.
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