Synthesis Of Size-controlled MIL-100(Fe) With Excellent Adsorption Capacity For Methylene Blue

In this work, the average particle size of metal organic framework (MOF) MIL-100(Fe) was modulated notably from 100 nm to 20 μm by changing the valence state of iron in iron sources and the amount of HF during hydrothermal reactions. The sorption capacity of MIL-100(Fe) for methylene blue (MB) increases with the particle size, and the maximum sorption capacity of the largest particles reached 1105 mg/g, much higher than previous reports on MOFs. The high sorption capacity could be attributed to high surface area and suitable pore structure. Additionally, the particle size determined the adsorption rate. The smaller the particle size, the higher the adsorption rate. The adsorption thermal isotherms were fitting better with the Langmuir model and the kinetic data were followed by the pseudo-second-order model. These results identified that MIL-100(Fe) exhibited great potential for purification of MB wastewater. When MIL-100(Fe) was used to degrade phenol through Fenton reaction, the reaction rate could improve distinctly with the increase of activation time and activation temperature. Therefore, MIL-100(Fe) showed great potential as a green and high efficient heterogeneous catalyst.