Photo-Fenton properties of MIL-88A(Fe) / Ti3C2 MXene with tunable active crystal facets: Universal for degradation of common pollutants in wastewater

In this study, the MIL-88A(Fe)/MXene Type-I heterojunction photocatalysts were successfully prepared. The active crystal plane of MIL-88A(Fe) was modulated by changing the solvent ratio used in the solvent-thermal reaction. Taking sulfamethoxazole as the main target pollutant, the effects of different morphologies of MIL-88A(Fe) and different loadings of MXene on the photocatalytic performance of the composite were discussed in detail. The results showed that the degradation rate of sulfamethoxazole by DA-M100 composite photocatalysis combined with Fenton effect could reach about 70% within 10 min of light exposure, and the degradation efficiency reached 92.66% after 60 min of light exposure. The universality test showed that DA-M100 had good photo-Fenton oxidation ability for common dyes and good photo-Fenton reduction ability for heavy metal ions in sewage. After 1 h of irradiation, the removal efficiency of Cr (VI), Cu (II) and Ni (II) reached 95.88%, 79.77% and 66 67%, respectively. The stability experiments showed that DA-M100 had a good adaptability to the environment. The results of electrochemical experiments and photoemission spectroscopy showed that DA-M100 increased the migration rate of photogenerated electron-hole pairs and decreased their recombination rate. The results show that the complex of iron-based MOF and MXene has a good application prospect in the treatment of industrial wastewater, and also provides a new idea for the modification of Type-I heterojunction.