Ultra-sustainable Fe₇₈Si₉B₁₃ metallic glass as a catalyst for activation of persulfate on methylene blue degradation under UV-Vis light.

ABSTRACT: Stability and reusability are important characteristics of advanced catalysts for wastewater treatment. In this work, for the first time, sulfate radicals (SO₄?^-) with a high oxidative potential (E^o?=?2.5-3.1?V) were successfully activated from persulfate by a Fe₇₈Si₉B₁₃ metallic glass. This alloy exhibited a superior surface stability and reusability while activating persulfate as indicated by it being used for 30 times while maintaining an acceptable methylene blue (MB) degradation rate. The produced SiO₂ layer on the ribbon surface expanded strongly from the fresh use to the 20^th use, providing stable protection of the buried Fe. MB degradation and kinetic study revealed 100% of the dye degradation with a kinetic rate k?=?0.640 within 20?min under rational parameter control. The dominant reactive species for dye molecule decomposition in the first 10?min of the reaction was hydroxyl radicals (?OH, E^o?=?2.7?V) and in the last 10?min was sulfate radicals (SO₄?^-), respectively. Empirical operating variables for dye degradation in this work were under catalyst dosage 0.5?g/L, light irradiation 7.7??W/cm², and persulfate concentration 1.0?mmol/L. The amorphous Fe₇₈Si₉B₁₃ alloy in this work will open a new gate for wastewater remediation.

SUBMITTER: Jia Z 

PROVIDER: S-EPMC5138629 | biostudies-literature | 2016 Dec

REPOSITORIES: biostudies-literature