A kind of mercaptoaryl functionalized mxene material and its preparation method and application
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A functionalized, mercaptoaryl technology, applied in the field of two-dimensional materials, can solve the problems of restricting the industrial application of new two-dimensional materials, easy oxidation of metal atoms, etc., and achieves the benefits of catalyst activity, dispersion and protection, and rich activity. The effect of adsorption sites
Active Publication Date: 2021-11-09
HUAIYIN TEACHERS COLLEGE
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[0008] However, the exposed metal atoms on the surface of 2D MXene are easily oxidized in oxygen-rich environments such as air and water, resulting in partial phase transformation of carbon / nitride MXene into oxides, thus limiting the industrial application of this new 2D material.
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Embodiment 1
[0048] Example 1 Ti 3 C 2 preparation of
[0049] (1) Etching Ti 3 AlC 2 :
[0050] After dissolving LiF (1.4g) in 15ml of 12mol / L hydrochloric acid solution and 4.5ml of water at room temperature, the solution was heated to 40°C and continued to stir for 10min; 3 AlC 2 (1g) was added to the above solution in a small amount in batches, and after stirring at 40°C for 24 hours, the Al element in the compound was completely removed to obtain an accordion-shaped compound with Ti 3 C 2 The multi-layer MXene material of the structural formula, the mixture is subjected to centrifugation, washing, ultrasonication, and vacuum drying to obtain Ti 3 C 2 T m (MXene material), T m Is the surface group F, Cl or OH.
[0051] (2) 0.5g Ti obtained in step (1) 3 C 2 T m Add it to 10ml of 4mol / L sodium hydroxide alkali solution, stir at room temperature for 8h, centrifuge, and wash the solid with water until the eluate is neutral, then disperse the solid in 5ml of water to obtain...
Embodiment 2
[0058] Example 2 Ti 3 C 2 Preparation of supported palladium catalyst
[0059] With the Ti that 0.2g embodiment 1 makes 3 C 2 Add 10ml of water, stir at 25°C for 30min, then add Pd(OAc) to the mixture 2 (3ml 0.6mg / m1), after ultrasonication for 6h, centrifugal separation, and wash with water and ethanol several times respectively, in vacuum drying 8h, obtain catalyst Ti 3 C 2 Supported palladium catalyst, the Pd load is 0.42wt%. Through the nitrogen adsorption-desorption isotherm test, it was found that the specific surface area decreased, which proved that the Pd catalyst was successfully loaded, and the actual loading amount of the ICP-MS test was 0.39wt%.
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Abstract
The invention discloses a mercaptoaryl-functionalized MXene material, referred to as a mercaptoaryl-MXene material for short, which has M n+1 x n -(Ph-SH) structure; wherein, the M is any one or at least two metal elements in IIIB, IVB, VB, VIB, VIIB groups; X is any one of C, N elements or A combination of both; n is 1, 2 or 3. Mercaptoaryl as a surface group enhances the oxidation resistance and structural stability of MXene materials; improves the relationship between MXene materials and the reduction product Cr 3+ At the same time, the solubility of MXene materials in wastewater is reduced, which is beneficial to the separation of MXene materials from water-soluble solvents. The invention also discloses a mercaptoaryl-MXene material supported palladium catalyst. The mercaptoaryl group improves the adsorption capacity of the mercaptoaryl-MXene material-supported palladium catalyst to the organic reaction substrate, which is beneficial to the combination of the mercaptoaryl-MXene material and the organic reaction substrate, thereby improving the catalyst activity.
Description
technical field [0001] The invention relates to the technical field of two-dimensional materials, in particular to a mercapto-functionalized MXene material and its preparation method and application. Background technique [0002] MXene materials are a class of layered nano-two-dimensional materials with novel structures and unique properties. Since their discovery in 2011, they have received extensive attention and research due to their high specific surface area, high aspect ratio, and unique electronic structure. At present, it has been widely used in the fields of energy storage and environmental governance. [0003] MXene is usually extracted from its parent material MAX phase (M n+1 AX n , n=1-3, M is a transition metal, which can be Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Y, Zr, Nb, Mo, Ru, Rh, Pd, Au, One or more of Cd, Hf, Ta, W, Re, Os, Ir, Pt, Au, La, Ce; A is a IIIA or IVA group element, and X is C or N) A layer atomic layer obtained , the reaction process is a...
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