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Metal-organic frameworks for the adsorption of gaseous toluene under ambient temperature and pressure
Summary：
The authors from the Hanyang University and Central Scientific Instruments Organization developed a series of metal-organic frameworks (MOFs) with high adsorption capacities for gaseous toluene under ambient conditions, achieving significant results in the field of air pollution control.
Background：
1. To address the problem of volatile organic compounds (VOCs) such as toluene, previous researchers conducted work on various adsorption materials like activated carbon and zeolites, achieving some success. However, these materials often suffer from issues like moisture interference and limited adsorption capacity.
2. The authors in this study proposed an innovative approach using MOFs with specific functional groups (e.g., amino groups) and obtained promising results in enhancing the adsorption capacity for toluene under ambient conditions.
Research Content：
1.Synthesis:
The authors synthesized six different MOFs (UiO-66, UiO-66(NH2), MOF-199, ZIF-67, MOF-5, and MIL-101(Fe)) using established procedures reported in the literature.
2.Characterizations:
1. Results of BET surface area and pore size distribution showed high surface areas and suitable pore sizes for effective adsorption.
2. SEM/TEM tests revealed the particle sizes and morphologies of the MOFs, confirming their structural integrity.
3. Other tests such as FTIR spectroscopy confirmed the presence of functional groups like amino groups in UiO-66(NH2).
3.Application:
The MOFs were tested for their adsorption capacities for gaseous toluene under ambient conditions. UiO-66(NH2) exhibited the highest adsorption capacity of 252 mg/g, with significant reductions observed under high humidity and temperature conditions.
4.Mechanism:
The analysis of experimental results indicated that hydrogen bonding and π-π complexation were the primary mechanisms for toluene adsorption. The adsorption capacities decreased with increasing temperature and humidity, suggesting a physisorption mechanism.
Outlook：
This research provides a new direction for the development of efficient adsorbents for VOCs like toluene under ambient conditions. The findings are significant for improving air quality and reducing the health risks associated with indoor pollutants.
Metal-organic frameworks for the adsorption of gaseous toluene under ambient temperature and pressure
Authors: Kowsalya Vellingiri, Pawan Kumar, Akash Deep, Ki-Hyun Kim
DOI: 10.1016/j.cej.2016.09.012
Link: https://www.sciencedirect.com/science/article/pii/S1385894716312499
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