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Co$_9$S$_8$ nanotubes; solvothermal; catalytic reduction; 4-nitrophenol.

Co$_9$S$_8$ nanotubes have been successfully synthesized via a facile two-step solvothermal method without the assistance of any template or surfactant, using cobalt sulphate (CoSO$_4$·7H$_2$O), urea and sodium sulphide (Na$_2$S·9H$_2$O) as starting reactants, and deionized water and glycol as the reactive medium. The phase and the morphologyof the as-obtained product were characterized by means of powder X-ray diffraction, energy dispersive spectrometry and scanning electron microscopy. The result displays that the Co9S8 nanotubes have hexagonal crosssections,the diameter of the nanotubes is about 200 nm and the wall thickness is of 50 nm. The experiments showed that the Co$_9$S$_8$ nanotubes could be used as new-type catalysts for the reduction of 4-nitrophenol. It was found thatthe as-obtained Co$_9$S$_8$ nanotubes contributed to the best catalytic activity.

TAO GENG^{1 2} YONGHONG NI² HONGYAN WANG¹ XIA ZHOU¹

1. School of Chemistry and Chemical Engineering, Suzhou University, Suzhou 234000, PR China
2. College of Chemistry and Materials Science, Key Laboratory of Functional Molecular Solids of Education Ministry, Anhui Laboratory of Molecule-Based Materials, Anhui Key Laboratory of Functional Molecular Solids, Annuli Normal University, Wuhu 241000, PR China

Published

15 October 2016

Manuscript received

27 August 2015

Accepted

21 March 2016