Synthesis of MIL-101(Cr) and its water adsorption performance

The open adsorption property is the ability of adsorbent to absorb water vapor in atmosphere. This paper reports MIL-101(Cr) was synthesized with sodium acetate as mineralization agent, and MIL-101(Cr) was purified using DMF and ethanol, which used as a high efficient adsorbent for water abstraction. The morphology and the pore structure of the as-prepared product were systematically discussed through N2 adsorption-desorption analysis and Scanning electron microscopy (SEM). And its thermal stability performance was measured by Thermogravimetric (TG), the heating temperature is too high, the material structure easily damaged. Besides, SEM images shows that the MIL-101(Cr) crystals are regular shaped octahedrons. The N2 adsorption-desorption analysis shows that MIL-101(Cr) possessed microspore, which was benefit for the water adsorption. In addition, the experiment studied the optimal activation temperature, MIL-101 (Cr) has the highest adsorption performance after activation at 140 °C. Finally, the water adsorption and recycling performance of MIL-101(Cr) were investigated. And recycling performance showed that desorption residual amount was lower than 9% of the total equilibrium adsorption capacity after 10 cycles. It is envisaged that MIL-101(Cr) will be a promising adsorbent for the freshwater production in coastal areas by extracting water from atmosphere.