Photocatalytic-adsorption Purification Performance of Pervious Concrete Containing TiO₂/LDHs-loaded Recycled Aggregates for Gas Pollutants

Abstract

The degradation performance of pervious concrete containing TiO₂/LDHs-loaded recycled aggregates for NO gas was analyzed using a gas phase catalytic degradation test device, simulating different environmental conditions such as load, ambient temperature, and illumination intensity, which provides theoretical support for practical engineering. The experimental results indicate that when the ambient temperature is controlled at 25 °C and the illumination intensity is 30 W/m², the sample prepared by soaking recycled aggregates in a 0.8% TiO₂/LDHs suspension exhibits the highest photocatalytic degradation rate for NO gas, reaching 72.54%. Further investigation on the influence of environmental temperature reveals that, at 25 °C, the maximum photocatalytic degradation rate for NO gas is 72.9%. Moreover, at an illumination intensity of 40 W/m², the maximum photocatalytic degradation rate for NO gas is 87.08%. Additionally, after three repeated photocatalytic tests, the sample demonstrates good stability, with a photocatalytic degradation rate of 58%. The nitrogen content in the eluent obtained from soaking the sample was determined to be 0.0022 mol/L, with a recovery rate of 80%. The adsorption experiment demonstrates that the sample exhibits a favorable adsorption effect on nitrate ions, reaching a maximum of 56.8%.

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