Plasma modification of Fe-MOF for efficient organic pollutants removal

In this work, Fe-based metal organic frameworks (Fe-MOF) were prepared and applied for wastewater purification. To enhance the pollutant adsorption performance, Fe-MOF materials were subjected to post-synthetic treatment. Such modified Fe-MOF presented negative zeta potential a higher specific surface area (1068 ​m2 ​g−1). While the crystal structure of Fe-MOF were well-preserved. Adsorption tests performed with model organic pollutants of Rhodamine B (RhB) and tetracycline (TC) demonstrated that the modified Fe-MOF exhibited better adsorption performance than that of pristine Fe-MOF (qe (max) for RhB and TC reaches up to 194.17 and 826.45 ​mg ​g−1). The adsorption process conformed to the pseudo-second-order model and the Langmuir isotherm model. The adsorption mechanism is ascribed to π−π conjugation and charge interaction. Furthermore, P-MIL-100 (Fe) displayed superior reusability and stability, making it competitive materials for the adsorption application.