Local structure of iron-containing soda-lime aluminosilicate glass and glass ceramics simulated as domestic waste slag exhausted from municipal waste combustion plants in Japan was investigated by 57Fe-Mössbauer spectroscopy. Photo-Fenton catalytic ability was evaluated by degradation test using aqueous solution of methylene blue (MBaq). Visible-light activated photocatalytic effect was observed for the first time from the MBaq degradation test using 15Na2O/15CaO/20SiO2/50Fe2O3 (in mass%, abbreviated as 50NCSF) glass which was heat treated at 1000 oC for 100 min. During the photocatalytic process, the concentration of MBaq was decreased from 10.0 to 0.0 μmol/L for 24 h with an apparent rate constant (k) of 4.78x10-4 min-1. The RT 57Fe-Mössbauer spectrum of 50NCSF was composed of a paramagnetic doublet with isomer shift (I.S.) of 0.24 mm/s and quadrupole splitting (Q.S.) of 0.99 mm/s due to distorted FeIIIO4 tetrahedra, superimposed on a magnetic sextet with I.S. of 0.36 mm/s and internal magnetic field (Hint) of 51.8 T due to hematite. Larger k value of 9.26x10-3 min-1 was recorded in heat-treated 15Na2O/15CaO/11Al2O3/19SiO2/40Fe2O3 glass, of which 57Fe-Mössbauer spectrum was composed of a sextet with I.S. and Hint of 0.37 mm/s and 51.2 T, respectively due to hematite. Very recently, Ali et al. revealed that heat-treated 5Na2O/41.4CaO/20Al2O3/27.6SiO2/6Fe2O3 glass showed a considerably larger k value of 115x10-3 min-1 by the introduction of 0.4 mol/L H2O2 into this system which was assigned to highly covalent distorted FeIIIO4 tetrahedra with I.S. and Q.S. of 0.12 and 1.88 mm/s, respectively. Smaller k value of 16.6x10-3 min-1 was highly evaluated as the potential catalyst prepared from domestic waste slag in Tokyo. It was concluded that highly active Photo-Fenton catalytic ability is achieved by hematite and highly distorted FeIIIO4 tetrahedra with high covalency. This new catalyst prepared by recycling waste slag will be utilized by excluding the impurities.

New photo-Fenton type catalyst of soda-lime aluminosilicate glass prepared by recycling waste slag

ACS Fall 2021

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