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Synthesis of Highly Crystalline NH2‑MIL-125 (Ti) with S‑Shaped Water Isotherms for Adsorption Heat Transformation
journal contribution
posted on 2017-01-18, 00:00 authored by Muhammad Sohail, Yang-No Yun, Eunkyung Lee, Sang Kyum Kim, Kanghee Cho, Jong-Nam Kim, Tae Woo Kim, Jong-Ho Moon, Hyunuk KimNH2-MIL-125
has been investigated as a water adsorbent because
of its high hydrothermal stability and S-shaped water adsorption isotherm.
Herein, we report the synthesis of NH2-MIL-125 with high
surface area and water capacity for an adsorption heat transformation
(AHT) system. NH2-MIL-125 derived from Ti(BuO)4 shows higher surface area and water uptake than those of Ti(iPrO)4-derived samples regardless of the synthesis
method. In a sense of crystallinity, a solvothermal method with static
conditions generated more distinct crystalline properties than the
one synthesized by a reflux reaction as confirmed from powder X-ray
diffraction analysis, UV–vis absorbance spectra, and scanning
electron microscopy images. Considering it as an adsorbent for an
AHT system, the Ti(BuO)4-derived sample synthesized by
a solvothermal method shows an ideal S-shaped isotherm with a steep
rise in water uptake at lower relative pressure (0.550 g/g at P/P0 = 0.30), which is attributed
to narrow triangle apertures and hydrophilic functional groups. This
material shows the dynamic water adsorption/desorption cycle without
any noticeable weight change.