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Journal of Environmental Biology

pISSN: 0254-8704 ; eISSN: 2394-0379 ; CODEN: JEBIDP

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        Abstract - Issue Jul 2017, 38 (4)                                                                                                             Back

nstantaneous and historical temperature effects on a-pinene

Preparation and characterization of TiO2-coated silk fibroin filters for photocatalytic oxidation of formaldehyde using waste silk cocoons


J. Triped1, W. Sanongraj2* and W. Khamwichit3

1International Postgraduate Programmes in Environmental Management, Graduate School,

Centre for Excellence on Hazardous Substance Management, Chulalongkorn University, Bangkok-10330, Thailand

2Research Excellence on Hazardous Substance Management, Department of Chemical Engineering, Faculty of Engineering,

Ubonratchathani University-34190, Thailand

3School of Engineering and resources, Walailak University, Nakhonsithammarat-80160, Thailand

*Corresponding Author E-mail:




Key words


Photocatalytic oxidation,

Silk cocoons,

Silk fibroin,

Titanium dioxide




Publication Data

Paper received : 07.04.2016

Revised received : 19.08.2016

Re-revised received : 02 .11.2016

Accepted : 22.12.2016



Aim: The possibility of producing valued devices from low cost natural resources is a subject of broad interest. The present study explored the preparation and characterization of pure silk fibroin (SF) filters and TiO2-coated SF filters for indoor air purification using waste silk cocoons generated from silk textile processing.


Methodology: Silk fibroin (SF) filter samples were characterized mainly by scanning electron microscopy, energy dispersive spectroscopy, Fourier transform infrared spectroscopy and mechanical analyses.


Results: The SEM results indicated that TiO2 particles adhered well onto the silk fibroin filters. Compared to pure SF filters, the mechanical and thermal properties of TiO2 SF filters were improved due to the conformational transition of silk fibroin to silk II structure. The percentage of catalyst (TiO2) doses varied from 1.0, 2.5, 5.0, and 7.5 % ( vol.sol.). The results derived from the kinetic model revealed that the photocatalytic rate followed the first order reaction. The highest removal efficiency of 68.21% was obtained at initial formaldehyde concentration of about 5.00 ppm and TiO2-coated SF filters of 5.0 % TiO2 wt.vol-1.sol.. The successful preparation of TiO2-coated SF filters from waste silk cocoons provide a promising opportunity to widen potential applications of SF in the biomaterial field.  


Interpretation: The successful preparation of TiO2-coated SF filters from waste silk cocoons not only provides a promising opportunity to widen potential application of SF in indoor air purification but also enhances a waste minimization from silk textile processing.



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