Double hollow MoS2 nano-spheres: Synthesis, tribological properties, and functional conversion from lubrication to photocatalysis

•Novel double-hollow-sphere MoS2 nanoparticles were synthesized on sericite.•Friction and wear decreased by 22.4 and 63.5% by the novel MoS2/sericite.•Friction induced conversion of MoS2/sericite from lubricant to catalyst.•MoS2/sericite can be used as a photocatalyst after lubricating service life....

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Bibliographic Details
Published in:Applied surface science 2017-01, Vol.392, p.1144-1152
Main Authors: Liu, Yueru, Hu, Kunhong, Hu, Enzhu, Guo, Jianhua, Han, Chengliang, Hu, Xianguo
Format: Article
Language:English
Subjects:
Catalysis
Catalysts
Double hollow nanostructure
Friction
Lubrication
Molybdenum disulfide
Nanoparticles
Nanostructure
Photocatalysis
Solid lubricant additives
Wear
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Summary:•Novel double-hollow-sphere MoS2 nanoparticles were synthesized on sericite.•Friction and wear decreased by 22.4 and 63.5% by the novel MoS2/sericite.•Friction induced conversion of MoS2/sericite from lubricant to catalyst.•MoS2/sericite can be used as a photocatalyst after lubricating service life.•A possible approach was proposed for designing a novel green lubricant. Molybdenum disulfide (MoS2) has extensive applications in industries as solid lubricants and catalysts. To improve the lubricating performance of MoS2, novel double-hollow-sphere MoS2 (DHSM) nanoparticles with an average diameter of approximately 90nm were synthesized on sericite mica (SM). When the DHSM/SM composite was used as an additive in polyalphaolefin oil, friction and wear decreased by 22.4% and 63.5% respectively. The low friction and wear were attributed to the easy exfoliation of DHSM. The DHSM/SM composite was then rubbed under 40MPa for 1h to investigate the exfoliation and functional conversion behaviors of DHSM. Results showed that DHSM (lubricating structure) on SM could be completely exfoliated into nanosheets (catalytic structure) by rubbing. The nanosheets exfoliated from DHSM presented good photocatalytic activity for the removal of organic compounds from waste water. This work provided both a novel solid lubricant for industrial applications and a possible approach to designing a novel green lubricant for use as a photocatalyst in organic-waste treatment after lubricating service life.
ISSN:0169-4332
1873-5584
DOI:10.1016/j.apsusc.2016.09.132