Nickel-based MOF film photocatalyst grown in-situ on foamed nickel surface, preparation method therefor, and application thereof
A nickel-based MOF film photocatalyst grown in-situ on a foamed nickel surface, a preparation method therefor, and an application thereof. The nickel-based MOF film photocatalyst grown in-situ on a foamed nickel surface is prepared by first immersing foamed nickel in a diluted acid and performing ultrasonic processing, then cleaning the foamed nickel with deionized water, and drying the foamed nickel to obtain surface-activated foamed nickel; immersing the surface-activated nickel foam in a mixture of an imidazole compound, sodium formate, and a solvent and reacting at 100° C. to 180° C. to obtain an unactivated nickel-based MOFs film on the surface of the foamed nickel, and after cooling to room temperature, removing same and soaking in an organic solvent to activate, and then drying the obtained product. The film photocatalyst synthesized in-situ on the foamed nickel can increase the specific surface area of the material to facilitate the adsorption and diffusion of VOCs, and can expose more catalytic sites, so that the VOCs can be effectively degraded under the action of sunlight.
1 . A method for synthesizing a nickel-based MOF film photocatalyst grown in-situ on a foamed nickel surface, characterized in that, the nickel-based MOF film photocatalyst grown in-situ on the foamed nickel surface is prepared by first immersing the foamed nickel in a diluted acid and performing ultrasonic processing, then cleaning the foamed nickel with deionized water, and drying the foamed nickel to obtain a surface-activated foamed nickel; immersing the surface-activated foamed nickel in a mixed solution of imidazole compounds, sodium formate and a solvent, reacting at 100 to 180° C. to give rise to a coordination effect of the imidazole compounds with nickel ions released by etching the surface of the foamed nickel, so as to obtain an unactivated nickel-based MOF film on the surface of the foamed nickel, and after cooling to room temperature, taking out the unactivated nickel-based MOF film and immersing it in an organic solvent for activating, and drying the obtained product.
2 . The method according to claim 1 , characterized in that, the imidazole compounds are one or more of 2-methyl imidazole, imidazole, benzoimidazole or 2-ethyl imidazole.
3 . The method according to claim 1 , characterized in that, the dilute acid is nitric acid, hydrochloric acid or sulfuric acid; and a concentration of the dilute acid is 0.5 to 6 mol/L.
4 . The method according to claim 1 , characterized in that, a molar ratio of the imidazole compounds, sodium formate and the solvent is (1 to 10):1:(100 to 200).
5 . The method according to claim 1 , characterized in that, the solvent is one or any two of methanol, water or DMF, and the organic solvent is methanol or ethanol.
6 . The method according to claim 1 , characterized in that, a time for the ultrasonic processing is 5 to 60 min; a time for the reaction is 4 to 18 h; and a time for the activating is 12 to 48 h.