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Mxene derived TiO2 nano sheet-graphene gel composite material as well as preparation method and application thereof
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A technology of graphene gel and graphene hydrogel, which is applied in chemical instruments and methods, chemical/physical processes, physical/chemical process catalysts, etc., can solve the difficulty of controlling the length and thickness of nanosheets, limiting TiO2 nanosheets, TiO2 sheets are easy to agglomerate and other problems, so as to improve photocatalytic performance, reduce nano-toxicity, and avoid agglomeration
Inactive Publication Date: 2020-10-20
TONGJI UNIV
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TiO2 nanosheets have excellent light absorption efficiency and electrontransmission rate, but when TiO2 nanosheets are synthesized by traditional hydrothermal method, their strong surface activity makes TiO2 sheets easy to agglomerate during growth, and the length and thickness of the prepared nanosheets Difficult to control, which limits the excellent performance of TiO2 nanosheets
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Embodiment 1
[0036] The Mxene derivation TiO of the present embodiment The preparation method of nanosheet-graphene gel composite material comprises the following steps:
[0037] (1) Weigh 0.5g of graphite oxide and dissolve it in a neutral aqueous solution, and move it into a 250ml volumetric flask, and form a uniform graphene oxide aqueous solution by stirring and ultrasonicating for 300min, wherein the concentration of graphene oxide is 2mg / mL;
[0038] (2) Add 0.5g Ti3C2Tx in the graphene oxide aqueous solution, ultrasonic 300min, evenly disperse to obtain the first mixed solution;
[0039] (3) Add 0.5g sodium ascorbate to the first mixed solution, ultrasonically disperse it evenly for 15 minutes, and form a Mxene-graphene hydrogel in a water bath at 95 degrees Celsius for 6 hours, and wash off the remaining impurities of the gel with distilled water ;
[0040] (4) NaBF of preparation 0.1mol / L and the solution of 1.0mol / L HCL as the second mixed solution;
[0041] (5) the Mxene-graph...
Embodiment 2
[0044] The Mxene derivation TiO of the present embodiment The preparation method of nanosheet-graphene gel composite material comprises the following steps:
[0045] (1) Weigh 0.5g of graphite oxide and dissolve it in a neutral aqueous solution, and move it into a 250ml volumetric flask, and form a uniform graphene oxide aqueous solution by stirring and ultrasonicating for 300min, wherein the concentration of graphene oxide is 2mg / mL;
[0046] (2) Add 0.25g Ti3C2Tx in the graphene oxide aqueous solution, ultrasonic 300min, evenly disperse to obtain the first mixed solution;
[0047] (3) Add 0.5g sodium ascorbate to the first mixed solution, ultrasonically disperse it evenly for 15 minutes, and form a Mxene-graphene hydrogel in a water bath at 95 degrees Celsius for 6 hours, and wash off the remaining impurities of the gel with distilled water ;
[0048] (4) NaBF of preparation 0.1mol / L and the solution of 1.0mol / L HCL as the second mixed solution;
[0049] (5) the Mxene-grap...
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Abstract
The invention provides an Mxene-derived TiO2 nano sheet-graphene gel composite material as well as a preparation method and application thereof. The preparation method comprises the following steps: forming a grapheneoxideaqueous solution by dissolving graphiteoxide in an aqueous solution; adding Mxene into the grapheneoxideaqueous solution to obtain a first mixed solution; adding a reducingagent into the first mixed solution, soaking the first mixed solution in a water bath to form Mxene-graphene hydrogel; adding a crystal face control agent into water to obtain a second mixed solution;putting the Mxene-graphene hydrogel into the second mixed solution, carrying out a hydrothermal reaction so as to obtain TiO2 nano sheet-graphene hydrogel; and freeze-drying the TiO2 nano sheet-graphene aerogel to obtain the TiO2 nano sheet-graphene aerogelcomposite material. The TiO2 nano sheets in the obtained material are regular in shape, uniform in size and uniform in crystalline phase; theaddition of graphene enhances the visible light utilization rate of the composite material and enhances the electron transmission efficiency, and the macroscopic body of the composite material is easy to separate.
Description
technical field [0001] The invention belongs to the technical field of environmental material synthesis, and in particular relates to a Mxene-derived TiO2 nanosheet-graphene gel composite material and its preparation method and application. Background technique [0002] In recent years, two-dimensional nanomaterials have shown broad development potential in the field of photocatalytic applications. Compared with similar materials, the larger surface area / volume ratio of two-dimensional nanomaterials increases the active sites on the surface, and its ultrathin structure reduces The migration distance from the bulk to the surface is reduced, thereby reducing the photocatalytic performance of the composite reinforced material of photogenerated carriers. TiO2 nanosheets have excellent light absorption efficiency and electrontransmission rate, but when TiO2 nanosheets are synthesized by traditional hydrothermal method, their strong surface activity makes TiO2 sheets easy to aggl...
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