Preparation method of Pt/graphene oxide/ferric oxide catalyst used for enhancing room temperature catalytic oxidation activity of formaldehyde

Abstract

The invention discloses a preparation method of a Pt / graphene oxide / ferric oxide catalyst used for enhancing the room temperature catalytic oxidation activity of formaldehyde. The method comprises the following steps: adding graphene oxide into an aqueous solution, carrying out ultrasonic stirring to completely disperse the graphene oxide, adding a Fe2O3 nano-material, and uniformly mixing the obtained solution and the Fe2O3 nano-material; continuously adding a Pt precursor solution, and uniformly mixing the Pt precursor solution and the above obtained solution; adding a reducing solution containing a reducing agent to reduce Pt, wherein the reducing agent is sodium borohydride, potassium borohydride or hydrazine hydrate; and centrifuging the above obtained solution, washing obtained solid with water, washing the solid with alcohol, drying the washed solid, cooling the dried solid, and grinding the cooled solid in order to obtain the Pt / graphene oxide / ferric oxide catalyst. Pt nano-particles, iron oxide and the graphene oxide are in close contact in the prepared catalyst, and strong interaction is formed among the Pt nano-particles, iron oxide and the graphene oxide due to surface electron layer disturbance, so multiple active oxygen species are generated; and the above oxygen substances participate in a formaldehyde oxidation reaction, so the formaldehyde catalysis activity of the composite catalyst is improved.

Description

technical field [0001] The invention relates to the technical field of nanomaterials, in particular to a method for preparing a Pt / graphene oxide / iron oxide catalyst that enhances the activity of catalytic oxidation of formaldehyde at room temperature. Background technique [0002] Formaldehyde is one of the typical indoor air pollutants, mainly from the decomposition of urea-formaldehyde glue and phenol-formaldehyde glue in building composite materials and interior decoration materials. Low concentrations of formaldehyde can irritate people's eyes and respiratory tract, causing symptoms such as chest tightness and skin itching. Formaldehyde at concentrations higher than 15ppm can cause death. Generally speaking, people spend 80% of their time indoors, such as workplaces, homes, and indoor leisure and entertainment venues. Therefore, it is of great significance to effectively remove pollutants and purify indoor air to ensure human health and improve people's quality of lif...

AI Technical Summary

Problems solved by technology

Although Pt / Fe oxides have been reported as catalysts for catalytic oxidation of formaldehyde at room temperature (Complete oxidation of formaldehyde at ambient temperature over supported Pt / Fe 2 o 3 catalysts prepared by colloid-deposition method, Journal of hazardous materials 186 (2): 1392-1397.), but its activity is low, still can not meet the needs of the existing indoor formaldehyde treatment, so it is still important to further improve its catalytic activity Significance

There are a large number of oxygen-containing functional groups on the surface of layered graphene oxide, such as hydroxyl, carboxyl, epoxy, etc. 79.), graphene / Fe 2 o 3 (Graphene oxide–Fe 2 o 3 Hybrid material as highly efficient heterogeneous catalyst fordegradation of organic pollutants, Carbon, 2013, 60, 437-444) and other graphene-supported catalysts have been studied, but they all belong to the fields of electrocatalysis, photocatalytic oxidation, and the field of catalytic oxidation of formaldehyde at room temperature The use of graphene for loading has not been reported

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