Preparation method of nickel/gold formaldehyde eliminating coating in bottom of heating radiator

Abstract

The invention provides a preparation method of a nickel / gold formaldehyde eliminating coating in the bottom of a heating radiator. The preparation method comprises the following steps: separately transferring HAuCl4 and NiCl2 aqueous solutions and dispersing activated carbon to the mixed solution through ultrasonic dispersion; continuously stirring the mixture, adding an NaOH solution, adding ethanediol into the solution after stirring, and placing the solution into a heating cover to be heated to boil; after an insulating reaction, stopping heating, naturally cooling the solution, and collecting a reaction product; after vacuum drying, carrying out thermal treatment in a nitrogen atmosphere to alloy Ni and Au; immersing an alloyed compound catalyst in an H2SO4 solution for 12h to remove unalloyed Ni; and preparing a dispersing liquid and coating the bottom of the heating radiator with the dispersing liquid. The method provided by the invention has the characteristics of being simple in preparation process and high in repeatability. The formaldehyde eliminating coating prepared by the method has a very large specific surface area and can catalyze formaldehyde to be oxidized at 40 DEG C to generate carbon dioxide and water.

Description

technical field [0001] The invention belongs to the technical field of indoor air purification, and in particular relates to a preparation method of a nickel-gold formaldehyde-eliminating coating on the bottom of a radiator. Background technique [0002] Formaldehyde is a common pollutant in the indoor atmosphere, and it has high toxicity. Short-term exposure to low concentrations of formaldehyde can irritate the eyes and respiratory tract and cause allergic reactions, and long-term exposure to trace amounts of formaldehyde can increase the possibility of cancer. Formaldehyde has been identified as a teratogenic and carcinogenic substance by the World Health Organization. The "Indoor Air Quality Standard" (GB / T18883-2002), which was implemented in my country in 2003, stipulates that the maximum allowable concentration of formaldehyde in indoor air is 0.10 mg per cubic meter (1 hour average). In summer in the north, windows can be opened to use air convection to discharge f...

AI Technical Summary

Problems solved by technology

① Adsorption method is the most commonly used method to eliminate formaldehyde. This method uses strong adsorptive materials with large specific surface area to absorb formaldehyde. For example, the commonly used strong adsorptive materials with large specific surface area are porous carbon materials, activated carbon, layered clay, Molecular sieve, activated alumina, silica gel, etc. This method is simple, but its disadvantage is that the adsorption capacity of the adsorbent is limited and needs to be replaced regularly, which increases the cost of eliminating formaldehyde; Interaction produces non-volatile substances, thereby removing formaldehyde from the purification object. For example, formaldehyde reacts with hydroxylamine sulfate aqueous solution to generate non-volatile sulfuric acid and oxime, and formaldehyde reacts with imidazolidine to generate non-volatile substances. This method requires regular replacement of active substances , not only increase the cost of eliminating formaldehyde, but also produce new potential pollutants; ③ photocatalytic method is to use titanium dioxide catalyst to oxidize and eliminate formaldehyde. It is oxidized to the product of carbon dioxide and water. The excess oxygen in the product comes from the oxygen molecules activated by photoelectrons. The disadvantage of this method is that it is difficult to deal with a large amount of formaldehyde due to the influence of light conditions; However, ozone and nitrogen oxides may be generated during the process, and the plasma equipment is expensive and energy-consuming; ⑤The catalytic combustion method refers to the oxidation of formaldehyde by oxygen molecules to form water and carbon dioxide under the condition of a catalyst, the usual transition Metal oxides can catalyze the oxidation of formaldehyde, but the complete oxidation temperature of formaldehyde is closely related to the type of catalyst

Its specification discloses Pt / TiO 2 The catalyst can efficiently oxidize formaldehyde completely at room temperature, but the catalyst uses a higher loading of the noble metal Pt, which has a higher cost, and Pt as a catalyst is easily oxidized by SO in the air. 2 , NO 2 Pollution inactivation