Abstract
MIL-100(Fe, Cr) and MIL-101(Cr) were synthesized by the hydrothermal method and applied to the adsorptions of five aromatic amines from aqueous solutions. These three metal-organic frameworks (MOFs) were well characterized by powder X-ray diffraction (PXRD), scanning electron microscope (SEM), transmission electron microscope (TEM), thermogravimetric analysis (TGA) and surface area analysis. The adsorption mechanism of three MOFs and the effects of the structures of MOFs on the adsorption of aromatic amines were discussed. The results show that the cavity system and suitable hydrogen bond acceptor were important factors for the adsorption for five aromatic amines of aniline, 1-naphthalamine, o-toluidine, 2-amino-4-nitrotoluene and 2-nitroaniline: (a) the saturated adsorption capacity of aniline, 1-naphthylamine and o-toluidine on MIL-100(Fe) were 52.0, 53.4 and 49.6 mg/g, respectively, which can be attributed to the intermolecular hydrogen bond interaction and cavity system diffusion. (b) The adsorption capacity of 2-nitroaniline and 2-amino-4-nitrotoluene on MIL-101(Cr) were 54.3 and 25.0 mg/g, respectively, which can be attributed to the more suitable pore size of MIL-101(Cr) than that of MIL-100(Fe, Cr). The MOFs of MIL-100(Fe) and MIL-101(Cr) can be potential materials for removing aromatic amines from aqueous solutions.
Highlights
As a typical organic compound, aromatic amines are widely used in the production of dyes, pharmaceuticals or resins [1]
Sudan Red is illegally used in the food industry to increase the freshness of food [6], and Sudan red will decompose in the human body to produce aromatic amines, causing human body damage
The particle sizes of the synthesized three materials are on the order of nano-sized as shown in transmission electron microscope (TEM) image (Figure 1a–c)
Summary
As a typical organic compound, aromatic amines are widely used in the production of dyes, pharmaceuticals or resins [1]. In the industrial production of dyes, aromatic amines can flow into the water in large amounts, causing water pollution. Azo dyes are widely found in textiles, paints, plastics and rubber. These dyes can be gradually degraded to produce aromatic amines (such as aniline), which are generally carcinogenic [2,3,4,5]. Sudan Red is illegally used in the food industry to increase the freshness of food [6], and Sudan red will decompose in the human body to produce aromatic amines, causing human body damage.
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