Influence of electrochemically deposited TiO₂ on the anti-weathering properties of heat-treated wood

ABSTRACT

Ultraviolet light-induced discoloration is a noticeable issue when heat-treated wood is used outdoors. In this study, titanium dioxide (TiO₂) particles were electrochemically deposited on the surface of heat-treated wood via a high-voltage electrostatic field (HVEF). Natural and artificial weathering tests were carried out to evaluate the anti-weathering properties after the electrochemical deposition. During HVEF treatment, Ti particles were triggered in the form of Ti⁴⁺. Ti⁴⁺ grafted with the hydroxyl groups of hemicellulose and lignin in the form of Ti–OH, and TiO₂ was produced due to the oxidizing atmosphere generated by HVEF. TiO₂ and Ti–OH played roles as UV absorbers, reducing degradation and discoloration of heat-treated wood. The photodegradation of lignin was alleviated effectively during both the artificial and natural weathering. The stability of wood color was remained. After the artificial weathering, the values of L*, a* and b* of the electrochemical depositied sample were 55, 10 and 25, respectively. The leaching amount of TiO₂ after artificial or natural weathering was less than 6% or 40%, respectively determined by atomic absorption spectroscopy. The results suggest the feasibility of the electrochemical deposition of TiO₂ for improving the anti-weathering properties of heat-treated wood and provide an effective strategy for industrial wood modification.

KEYWORDS:

• Heat-treated wood
• electrochemical deposition
• titanium dioxide (TiO₂)
• artificial weathering
• natural weathering
• color change

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was financially supported by the National Natural Science Foundation of China [No. 31971591, 32171705].