Preparation method of environmentally-friendly formaldehyde degradation photocatalyst

It is a photocatalyst and environment-friendly technology, which is applied in the field of load-type photocatalyst formaldehyde removal. It can solve the problems of high toxicity of scavenger compounds, limited formaldehyde removal effect, and impact on user health. It achieves good physical and chemical stability, excellent mechanical stability, The effect of high load ratio

Inactive Publication Date: 2019-08-23
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the above two types of formaldehyde pollution, formaldehyde scavenger products currently on the market usually use physical adsorption or chemical adsorption to eliminate residual formaldehyde, but there will be the following technical defects: (1) Physical adsorption, such as activated carbon, bamboo charcoal, etc. , the adsorption capacity is limited, and it is inconvenient to use, and often needs to be replaced, causing secondary pollution; (2) using chemical adsorption, although the effect of treating formaldehyde is good, but the compound added in the scavenger is more toxic and not environmentally friendly. For example, the application number is The Chinese invention patent of 201410542797.8 discloses a formaldehyde scavenger, which contains hydrazide (hydrazine compound, which has a formaldehyde scavenging effect), and free hydrazine is present in use, which is toxic and will cause environmental pollution after long-term use, and affect the health of users in the living room (3) The use effect of some commercially available products will be limited by the application environment. Most formaldehyde scavengers contain titanium dioxide. For example, the Chinese invention patent with application number 201210279279.2 discloses an indoor formaldehyde pollution removal catalyst, which contains titanium dioxide, dioxalate Hydrazide, etc., because titanium dioxide is an ultraviolet photocatalyst, the removal effect of formaldehyde is extremely limited under natural light or no light conditions, and has application limitations

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Pretreatment of Houttuynia cordata powder: In the reactor, add deionized water: 55 mL, concentrated sulfuric acid: 14 mL, stir well, cool to room temperature, potassium permanganate: 5g, dissolve, then add fish Houttuynia cordata powder: 14g, soak at room temperature for 8 hours, boil for 35 minutes, wash with deionized water until neutral, separate solid and liquid, put the solid into a solution of 12% ethylenediamine by volume, and the solid-liquid ratio is 1g: 10~20mL, soaked for 15 hours, separated from solid and liquid, washed with deionized water until neutral, dried to obtain pretreated Houttuynia cordata powder;

[0022] (2) Preparation of porous Houttuynia cordata powder: In the reactor, add deionized water: 34 mL, soluble starch: 3 g, egg white: 33 g, heat and stir to dissolve, pretreatment Houttuynia cordata powder: 30 g, ultrasonically disperse For 40 minutes, freeze at -18°C, then transfer to a freeze dryer to dry for 24 hours, and grind to obtain porou...

Embodiment 2

[0026] (1) Pretreatment of Houttuynia cordata powder: In the reactor, add deionized water: 104mL, concentrated sulfuric acid: 30mL, stir well, cool to room temperature, potassium permanganate: 8g, dissolve, then add Houttuynia cordata Powder: 32g, soak at room temperature for 8 hours, boil for 35 minutes, wash with deionized water until neutral, separate the solid from the liquid, put the solid into a 12% ethylenediamine solution by volume, and the solid-to-liquid ratio is 1g: 10-20mL, soaked for 15 hours, separated from solid and liquid, washed with deionized water until neutral, dried to obtain pretreated Houttuynia cordata powder;

[0027] (2) Preparation of porous Houttuynia cordata powder: In the reactor, add deionized water: 64 mL, soluble starch: 8 g, egg white: 70 g, heat and stir to dissolve, pretreatment Houttuynia cordata powder: 58 g, ultrasonically disperse For 40 minutes, freeze at -18°C, then transfer to a freeze dryer to dry for 24 hours, and grind to obtain po...

Embodiment 3

[0031] (1) Pretreatment of Houttuynia cordata powder: In the reactor, add deionized water: 58mL, concentrated sulfuric acid: 13 mL, stir well, cool to room temperature, potassium permanganate: 6g, dissolve, then add fishy smell Grass powder: 12g, soak at room temperature for 8 hours, boil for 35 minutes, wash with deionized water until neutral, separate the solid from the liquid, put the solid into a 12% ethylenediamine solution by volume, and the solid-to-liquid ratio is 1g : 10 ~ 20mL, soaked for 15 h, solid-liquid separation, then washed to neutral with deionized water, dried to obtain pretreated Houttuynia cordata powder;

[0032] (2) Preparation of porous Houttuynia cordata powder: In the reactor, add deionized water: 36 mL, soluble starch: 2 g, egg white: 30 g, heat and stir to dissolve, pretreatment Houttuynia cordata powder: 32 g, ultrasonically disperse For 40 minutes, freeze at -18°C, then transfer to a freeze dryer to dry for 24 hours, and grind to obtain porous Hou...

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PUM

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Abstract

The invention discloses a preparation method of an environmentally-friendly formaldehyde degradation photocatalyst. The method is characterized by comprising the following steps: preparing porous houttuynia cordata powder by adopting soluble starch, egg white and pretreated houttuynia cordata powder; preparing a rubidium-doped BiVO3 photocatalyst by adopting 4 mol / L nitric acid, vanadium pentoxide, rubidium nitrate and bismuth oxide; adding the following materials into a reactor according to percentages by mass: 54-58% of deionized water, 34-38% of the porous houttuynia cordata powder and 2-4%of polyacrylic acid, performing ultrasonic dispersion, adding 4-8% of the rubidium-doped BiVO3 photocatalyst, wherein a sum of percentages by mass of each component is 100%, continuing ultrasonic dispersion for 30 min, performing solid-liquid separation, performing washing by using deionized water, and performing drying to obtain the environmentally-friendly formaldehyde degradation photocatalyst. The environmentally-friendly formaldehyde degradation photocatalyst provided by the invention has the characteristics of a simple preparation method, good stability, degradability and environmentalfriendliness; and the photocatalyst has the characteristics of mild reaction conditions, high catalytic activity, a less usage amount and a high formaldehyde degradation rate.

Description

technical field [0001] The invention relates to the technical field of loaded photocatalyst formaldehyde removal, in particular to a preparation method of an environment-friendly photocatalyst for degrading formaldehyde and its application in formaldehyde removal. Background technique [0002] Formaldehyde is a colorless, soluble, irritating gas. It is recognized as a highly toxic substance. Formaldehyde can be absorbed through the respiratory tract, and damage the body by increasing tissue active oxygen, lipid peroxidation, and affecting the body's immune system, causing bronchial asthma, etc.; formaldehyde also has a stimulating effect on the skin and mucous membranes, which can cause allergic dermatitis, Pigmentation, skin necrosis, etc.; In addition, formaldehyde is also highly carcinogenic and can cause nose cancer, blood cancer, etc. Moreover, high concentrations of formaldehyde are harmful to the respiratory system, nervous system, immune system, and liver. It can b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/36B01J35/10B01D53/86B01D53/72
CPCB01D53/8668B01J31/36B01J35/004B01J35/1004
Inventor 李慧芝许崇娟杨春霞
Owner UNIV OF JINAN
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