Performance and VOCs emission inhibition of environmentally friendly rubber modified asphalt with UiO-66 MOFs

Volatile organic compounds (VOCs) with highly toxic, irritating and carcinogenic were released during the use of rubber modified asphalt (RMA), causing adverse harm to the atmospheric environment and human health. In this study, UiO-66 was synthesized and used for reducing VOCs emissions of RMA, and its basic properties were determined. The rheological temperature properties of environmentally friendly rubber modified asphalt (ERMA) were discussed, and the release behavior and treatment mechanism of VOCs were studied. The results showed that a series of UiO-66 materials had been successfully synthesized with desired crystalline properties, regular morphology and high-temperature stability. Meanwhile, the adsorption of VOCs was remarkable due to the unsaturated metal sites and high specific surface area of UiO-66 materials. The concentration of VOCs emissions gradually decreased from 845.94 mg/m3 to 419.92 mg/m3 with the addition of UiO-66-HAc-0.1M. Moreover, it had a significant inhibitory effect on the reduction of category 1 carcinogens concentrations by 70%. The dosage of UiO-66 was 0.6% considering the performance of ERMA, emission reduction effect, and economic benefit. The findings of this study provided a scientific basis for the management and formulation of emission reduction strategies of MOFs materials in asphalt pavement VOCs.