Preparation method of transition metal carbide and composite catalyst
A technology of composite catalysts and transition metals, applied in the field of photocatalytic materials, can solve problems such as complex preparation conditions of transition metal carbides
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[0023] The first aspect of the embodiment of the present application provides a method for preparing a transition metal carbide, such as figure 1 Shown, this preparation method comprises the steps:
[0024] S01: Provide transition metal salt and carbon source;
[0025] S02: dissolving the transition metal salt and the carbon source in water, and then performing heating and evaporation treatment to obtain a precursor;
[0026] S03: Calcining the precursor to obtain the transition metal carbide.
[0027] The preparation method of the transition metal carbide provided by the application uses transition metal salt and carbon source as raw materials, dissolves it in water, and hydrolyzes the transition metal salt during heating and evaporation to form transition metal hydroxide colloid and corresponding acid, and the acid is heated Volatilization during the process, transition metal hydroxide colloid has strong adsorption, can evenly adsorb carbon source to form precursor solid s...
Embodiment 1
[0044] A kind of preparation of composite catalyst
[0045] (1) Co-catalyst Co 3 Preparation of C:
[0046] Dissolve 2g of cobalt acetate and 10g of glucose powder in 30mL of deionized water, stir for 30 minutes and mix well, then heat and evaporate the deionized water at 80°C and keep stirring with a glass rod until a viscous colloid is obtained, then put the colloid in a porcelain boat placed in a tube furnace for calcination at 550°C for 5 hours, with a heating rate of 5°C / min, the calcined product was washed three times with distilled water, collected by centrifugation at 5000 rpm, dried in a vacuum oven at 60°C for 8 hours, and then ground to obtain Co 3 C powder.
[0047] (2) preparation of composite catalyst:
[0048] 100mg of CdS powder and 5mg of Co obtained above 3 C powder was placed in 50mL deionized water, ultrasonically dispersed for 2h, then continuously stirred for 18h, centrifuged at 5000rpm to obtain a yellow-green precipitate, washed with absolute ethano...
Embodiment 2
[0050] A kind of preparation of composite catalyst
[0051] (1) Promoter Fe 3 Preparation of C:
[0052] Dissolve 2.5g of ferric chloride and 8g of chitosan powder in 30mL of deionized water, stir for 30 minutes and mix evenly, then heat and evaporate the deionized water at 80°C and keep stirring with a glass rod until viscous colloid is obtained, and then the colloid Put it in a porcelain boat, place it in a tube furnace for calcination at 600°C for 4 hours, and heat up at a rate of 5°C / min. The calcined product is washed with distilled water three times and then collected by centrifugation at 6000 rpm. It is dried in a vacuum oven at 60°C for 8 hours, and then ground to obtain Fe 3 C powder.
[0053] (2) preparation of composite catalyst:
[0054] 200mg g-C 3 N 4 powder and 14 mg of Fe obtained above 3 C powder was placed in 100mL deionized water, ultrasonically dispersed for 2h, then continuously stirred for 18h, centrifuged at 6000rpm to obtain a gray precipitate, w...
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