The Fenton catalyst prepared via ZSM-5/MOR composite molecular sieve supported Fe/La duplex metal and its dye degradation performance

In-situ crystallization was used to prepare the composite molecular sieve ZSM-5/MOR (Z/M) successfully, and FeLa-ZSM-5/MOR (FeLa-Z/M) was obtained by loading Fe and La on the surface of the composite molecular sieve by hydrothermal method. The composite molecular sieve combined the water absorption of mordenite (MOR) and the mass transfer performance of ZSM-5, and effectively improved the surface area and porous structure. This zeolite improved the dispersion performance of active sites in Z/M and reduced mutual aggregation between particles, which was conducive to catalytic efficiency. The addition of La increases the number of oxygen vacancies, according to XRD, TEM, XPS, UV-DRS, and other data analyses. Because doping of La stretched the Fe–O bond, reduced the oxygen vacancies’ formation energy, and promoted oxygen vacancies’ formation, which was an essential reason for Fe3+ reduction and Fe3O4 formation. The addition of La also had a highly dispersed effect on Fe. Under the optimal conditions, with a FeLa mass ratio of 1:1, FeLa-Z/M at 25 mg, H2O2 at 0.5 ml, and a pH of 3, the degradation rate of IC was found to be 97.8