Abstract
The popularization of inorganic nanomaterials doping, which serves as an effective method to improve the aging resistance of bitumen, is constrained by suboptimal lipophilicity and limited broad-spectrum UV absorption. To overcome this, we synthesized an environmentally-friendly, broad-spectrum UV-blocking nanocomposite by coating nano TiO2–ZnO (Nano-TZ) with sustainable lignin. TEM, T-IR, and photocatalytic activity test results indicate successful lignin coating on the Nano-TZ surface, with the optimal concentration being 15% (Nano-15L@TZ). Rheological test results demonstrated improved UV- and thermal-oxidative aging resistance of the Nano-15L@TZ-modified bitumen compared to those treated with uncoated nanomaterials. The synergistic modification mechanism of the Nano-15L@TZ composite was elucidated by combining the contact angle with UV–Vis and XPS VB tests. Nano-TZ exhibited broad-spectrum UV blocking properties that mitigated the UV aging of bitumen and lignin, while lignin effectively improved its compatibility with bitumen and captured radicals generated by Nano-TZ and aged bitumen.
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