| dc.description.abstract | This study investigates the characterization of air-purifying photocatalyst lightweight material manufactured by paper mill sludge calcined ash by combination of autoclaving technique (steam pressure 0.9 MPa, steam temperature 190 °C, and reaction time 8 hours) and nano-titanium dioxide (TiO2) coating technology. In order to evaluate the catalytic ability of prepared air-purifying photocatalyst, the toluene removal experiments were also conducted.
In the case of CaO/SiO2 ratio 1.11 and curing by humidity control, the experimental results indicated that the lightweight material has not only met the criteria of relevant autoclaving lightweight material with bulk density (1.07 g/cm3) and apparent porosity (57.13%), but also has the good performance of compressive strength (higher than 57 kg/cm2).The mainly crystal phases of the lightweight material were identified by XRD including calcium silicon hydrate (C-S-H), Calcite(CaCO3), Boehmite(AlO(OH)), and Ca2SiO4. According to the analysis results of the air purification test, the prepared catalysts containing 0.5%, 1.0%, and 1.5% TiO2 have a good photocatalytic characteristics. Especially for 1.0% TiO2 air-purifying photocatalyst, it presents the best photocatalytic activity with corresponding to 81.88% of CO2 mineralization rate. On the other hand, the prepared catalyst durability seems not to be good enough. After five cycles, the CO2 mineralization rate was decreased to 3.59%. In this study, the prepared air-purifying photocatalyst could provide the good photocatalytic characteristics to convert toluene into CO2. Although the prepared air-purifying photocatalyst have a good potential for application; however, to clarify the long-term application and market development of air-purifying photocatalyst lightweight material, it is necessary to further discuss and evaluate the toluene removal mechanism in the future. | en_US |