Mohammad Mehdi Shirmohamadi

Title : 3d spacer fabric modified through In-Situ synthesis and electrostatic charge-deposition of activated carbon/nanosilver for bacterial elimination and SO2 filtration

Abstract:

The objective of the present study was to modify three dimensional polyester textile fabric using silver nanoparticles (AgNPs) and activated carbon (A) for antibacterial activity and SO₂ elimination properties of hospitals air filters. Silver nanoparticles were effectively in situ synthesized on the porous of the activated carbon powder, using the wet chemical reduction method, with silver nitrate and sodium borohydride at room temperature. This composite (A/AgNPs) was loaded on the fiber surface of 3D spacer polyester fabric (F) using novel electro-deposition device, without the need of water and reactor system. The production filter was characterized by field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM) and energy dispersive X-ray powder diffraction (XRD). The antibacterial activities of A/AgNPs powder and F-A/AgNPs fabric filter were studied using disk diffusion and modified shake flask method (AATCC-100), respectively.

The antibacterial properties of control swatch (F-A0) and test (F-A1, F-A2 and F-A3) were evaluated against S. aureus (ATCC 29213), a Gram-positive and P. aeruginosa (ATCC 27853), a Gram-negative bacterium. Results showed the antibacterial effect of A/AgNPs powders against S. aureus is no growth inhibition zone of bacteria was observed for samples. The bacterial colonies of S. aureus and P. aeruginosa were completely killed after 2 h of incubation on fabric filter samples. Also, in tested fabric filter saturation time for SO₂ adsorption with flow rate of 1600 L/m²/min from the polluted air stream was 15 min.

Audience Take Away Notes:

• The hospital indoor air quality (IAQ) requires proper air filtration system to supply healthful air for healthcare workers against occupational diseases. In this study we explain about source and kinds of hospital pollutions.
• In this research we are practically working on new modern technology to design an air filtering fabric to eliminate the bacterial and chemical pollutions from passing air to solve the problem.
• This new product has high efficiency, low price, low energy consumption, sustainable production methods and with no negative side effect.
• After the Covid-19 era this topic is so important for healthcare job environment and it can expand for more research topic and investigation.

Biography:

Dr. Shirmohammadi studied textile chemistry at Azad university of Tehran in 2007-2010 as MS. He received his PhD degree in 2018 at same university. He academically focused on antibacterial and absorber air filters for clinical purpose such as healthcare respiratory mask and hospitals filter. Practically, he is CEO of a knowledge base company that producing of N95 respiratory masks, HME filters and hospital AC.  He has a lot of papers, inventions and innovations in that field. Also, he is ambassador and panelist of Waterloo Filtration Institute (WFI) located in USA. Now, his research is on sustainable antibacterial air filtration using nanotechnology and modern technology.