Coating of ZnO nanoparticles onto the inner pore channel surface of SiC foam to fabricate a novel antibacterial air filter material

Published Date

June 2015, Vol.41(5):7080–7090, doi:10.1016/j.ceramint.2015.02.016

Title 

Coating of ZnO nanoparticles onto the inner pore channel surface of SiC foam to fabricate a novel antibacterial air filter material

• Author 

• Jian Hu
• Zhaoxiang Zhong ^,
• Feng Zhang
• Weihong Xing ^,
• Ze-Xian Low
• Yiqun Fan

• State Key Laboratory of Materials-Oriented Chemical Engineering, National Engineering Research Center for Special Separation Membrane, Nanjing Tech University, Nanjing 210009, China

Received 26 December 2014. Revised 26 January 2015. Accepted 4 February 2015. Available online 10 February 2015.

Abstract

ZnO nanoparticles layer was successfully and firmly coated onto the surface of the pore channel of SiC foam via a sol–gel method in the presence of a negative pressure suction to fabricate a novel anti-bacterial air filter material. Composition, structure and morphology of the coated ZnO were characterized by scanning electron microscope, X-ray diffraction, transmission electron microscopy, energy dispersive spectroscopy and X-ray photoelectronic spectroscopy. A possible formation mechanism of ZnO was proposed. A high crystallized ZnO nanoparticles layer was formed when the calcination temperature exceeds 500 °C. The coated ZnO crystallites were hexagonal wurtzite and the grain size was in the range of 20–50 nm. No evident N₂ permeability difference was detected in gas permeation tests before and after ZnO nanoparticles coating. ZnO-coated SiC foam was found to exhibit an excellent anti-bacterial property with sterilization rate of Escherichia coli exceeding 99.8% for all modified samples.

Keywords 

ZnO nanoparticles

SiC foam

Antibacterial air filter

Gas permeability

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