The interesting surface properties of MOFs and COFs such as accessible functionalized tunnels, tunable pore size and extraordinarily high surface area make them possess excellent adsorption properties. In addition, both MOFs and COFs can be tailored to improve their adsorption properties by suitable modification methods. Therefore, with their excellent adsorption properties, MOFs and COFs are widely used in gas adsorption, pollutant removal, environmental remediation and other fields. The evaluation and analysis
of adsorption properties of MOFs and COFs will help to expand their application fields and lays the foundation for practical industrial application. Alfa Chemistry has global testing and analysis abilities and we provide high quality service to help you understand the adsorption properties of MOFs and COFs.
- Adsorption properties analysis
Based on our rich research and analysis experience, Alfa Chemistry can analyze and evaluate the adsorption properties of MOFs and COFs for a variety of substances, such as gases, heavy metals, dyes, etc. The details are as follows.
- Analysis of adsorption properties on gases: The gas types include hydrogen, methane, nitric oxide, nitrogen dioxide, carbon monoxide, carbon dioxide, sulfur dioxide, ammonia, hydrogen sulfide, etc.
- Analysis of adsorption properties on heavy metal ions: The heavy metal ions include As(V), As(III), Cr(VI), Cr(III), Cd(II), Pb(II), Hg(II), Sb(III), Sb(V), Ni(II), Cu(II), Zn(II), Co(II), Ag(I), Au, etc.
- Analysis of adsorption properties on organic dyes: The organic dyes include anionic dyes and cationic dyes such as methylene blue, malachite green, methyl orange, indigo carmine, Chrome Azurol S, congo red, etc.
- Analysis of adsorption properties on personal care products: The personal care products include drugs such as antibiotics, painkillers and personal care products such as skin care products, hair care products and so on.
- Analysis of adsorption properties on radionuclides: The radionuclides include U(VI), Cs(I), Eu(III), Th(IV), I(IV), etc.
- Analysis of adsorption properties on other substance: Other substance includes volatile organic compounds (chlorobenzene, acetaldehyde, benzene), triphenyl phosphate, nitrophenol, toluene, bisphenol A, etc.
- Adsorption mechanism analysis
Based on this, we also launched the adsorption mechanism analysis service of MOFs and COFs on the above substances. According to our rich research experience, the adsorption mechanism mainly includes the following aspects:
- Adsorption via hydrogen bonding
- Adsorption via electrostatic interaction
- Adsorption via acid–base interaction
- Adsorption via π–π interaction
- Adsorption onto coordinatively unsaturated sites
- Adsorption based on the breathing effect
- Adsorption via hydrophobic interaction
- Adsorption based on the size-sieving effect
Fig. 1. Schematic diagram of adsorption mechanism of MOFs and COFs .
- Adsorption properties analysis method: Due to the differences of substances to be adsorbed and customer requirements, the evaluation methods and test condition of adsorption properties will be different. So, it is difficult to build a comprehensive analysis method that is suitable for all situations. In this case, Alfa Chemistry will rigorously design related adsorption experiments and then evaluate adsorption performance according to the needs of customers. What is clear is that the general principle of the adsorption property evaluation method of MOFs and COFs at Alfa Chemistry is: A certain number of treated MOFs and COFs materials are placed in a container which containing substances to be adsorbed. After a period of time under certain conditions, relevant technical means are adopted to measure the quantity difference of substances to be adsorbed before and after adsorption to determine their adsorption property.
- Adsorption mechanism analysis method: We mainly adopt two approaches to study their adsorption mechanism. (1) By using many different advanced analytical instruments for study of adsorption mechanisms such as X-ray photoelectron spectroscopy (XPS), Fourier transformed infrared spectra (FTIR), and X-ray absorption fine structure (ANES) spectroscopy. (2) By using theoretical calculation methods such as density functional theory (DFT) and molecular simulation to explain their adsorption mechanisms.
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- Lv S. W., et al. Recent advances on porous organic frameworks for the adsorptive removal of hazardous materials[J]. Journal of Environmental Sciences, 2019, 80: 169-185.