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Neutral formaldehyde photopurifying agent and preparation method thereof

A purification agent and formaldehyde technology, applied in the direction of chemical instruments and methods, separation methods, physical/chemical process catalysts, etc., can solve the problems of low light utilization rate of light purification agents, unsafe hidden dangers, poor dispersion stability, etc., to achieve safe use , thorough purification, stable dispersion and long-lasting effect

Inactive Publication Date: 2018-11-23
SHENYANG INST OF AUTOMATION GUANGZHOU CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the shortcomings and deficiencies of the above-mentioned prior art light purifiers such as low light utilization rate, poor dispersion stability, and unsafe hidden dangers caused by the dispersion system being acidic or alkaline, the primary purpose of the present invention is to provide a neutral The preparation method of formaldehyde light purifying agent

Method used

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  • Neutral formaldehyde photopurifying agent and preparation method thereof
  • Neutral formaldehyde photopurifying agent and preparation method thereof
  • Neutral formaldehyde photopurifying agent and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0049] Put 10g of dicyandiamide in a crucible and cover it, calcined in a muffle furnace, the calcining temperature is 550°C, the holding time is 4 hours, and the heating rate is 2.0°C / min; after natural cooling, it is ground into powder to obtain graphite phase nitrogen Carbonization (CN-D-1), weighed 1.2g, put it in a crucible without a cover, spread it out, and calcined again. The calcining temperature was 500°C, the holding time was 3 hours, and the heating rate was 5.0°C / min. After natural cooling, a high specific surface area carbon nitride photocatalyst (CN-D-2) was obtained. Weigh 0.1g CN-D-2, disperse it in 100mL water (about 100g), crush it with a cell crusher for 0.5h, and then centrifuge it with a centrifuge to obtain a milky white suspension with a concentration of about 0.01wt% and a pH of about 6~ 7.

[0050] The photocatalyst prepared in embodiment 1 is carried out XPS, DRS, XRD etc. characterization, the result is as follows Figure 1 to Figure 8 shown.

[...

Embodiment 2

[0058] Put 10g of dicyandiamide in a crucible and cover it, calcined in a muffle furnace, the calcining temperature is 650°C, the holding time is 2 hours, and the heating rate is 5.0°C / min; after natural cooling, grind it into powder to obtain graphite phase nitrogen Carbonization (CN-D-1), weighed 1.2g, put it in a crucible without a cover, spread it out, and calcined again. The calcining temperature was 550°C, the holding time was 1 hour, and the heating rate was 10.0°C / min. After natural cooling, a high specific surface area carbon nitride photocatalyst (CN-D-2) was obtained. Weigh 0.01g of CN-D-2 in 100mL of water (about 100g), sonicate for 1 hour with an ultrasonic machine, and then centrifuge with a centrifuge to obtain a milky white suspension with a concentration of about 0.008wt% and a pH of about 6-7.

Embodiment 3

[0060] Put 10g of dicyandiamide in a crucible and cover it, calcined in a muffle furnace, the calcining temperature is 500°C, the holding time is 6 hours, and the heating rate is 1.0°C / min; after natural cooling, it is ground into powder to obtain graphite phase nitrogen Carbonization (CN-D-1), weighed 1.2g, put it in a crucible without a cover, spread it out, and calcined again. The calcining temperature was 450°C, the holding time was 4 hours, and the heating rate was 2.0°C / min. After natural cooling, a high specific surface area carbon nitride photocatalyst (CN-D-2) was obtained. Weigh 1g of CN-D-2 in 100mL of water (about 100g), use a ball mill to mill for 8 hours, and then let it stand to remove the precipitate to obtain a milky white suspension with a concentration of about 0.011wt% and a pH of about 6-7.

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Abstract

The invention belongs to the technical field of photopurifying agents and discloses a neutral formaldehyde photopurifying agent and a preparation method thereof. The preparation method disclosed by the invention comprises the following steps: S1, calcining dicyandiamide under 500 to 650 DEG C to obtain graphite-phase carbon nitride; S2, grinding the graphite-phase carbon nitride into powder and calcining again under 400 to 550 DEG C in the air atmosphere to obtain carbon nitride; S3, dispersing carbon nitride into water to obtain the neutral formaldehyde photopurifying agent. The preparation method disclosed by the invention has the advantage of simpleness in operation; the prepared formaldehyde photopurifying agent has the advantages of high activity, larger specific surface area (170.2 m<2> / g), ability in providing more reaction sites, stronger absorption to 200 to 1100nm waveband light and stronger photocatalytic degradation purifying ability under visible light irradiation; when being applied to photocatalytic degradation of formaldehyde gas, 61% of formaldehyde can be degraded within 16 hours; furthermore, neutral water is utilized as a dispersing agent, so that more safety inuse is achieved, and dispersity is stable and durable.

Description

technical field [0001] The invention belongs to the technical field of light purifier materials, in particular to a neutral formaldehyde light purifier and a preparation method thereof. Background technique [0002] Formaldehyde is one of the simplest and most common aldehydes. Indoor formaldehyde gas in the home mainly comes from burning cigarettes, decorative materials and some textiles. Formaldehyde has a greater toxic effect on the human body. The stimulation of formaldehyde can cause some acute symptoms, such as headache, discomfort, tearing, sneezing, coughing, nausea, and dyspnea. Long-term effects can induce diseases in multiple systems. New research shows that formaldehyde can cause changes in the central nervous system, enzyme activity in the body, and changes in the endocrine immune system. High concentrations of formaldehyde are toxic to the nervous system, immune system, and liver. Stimulate the conjunctiva and mucous membrane of the respiratory tract to pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J35/10B01D53/86B01D53/72
CPCB01D53/72B01D53/8668B01J27/24B01D2255/70B01D2255/802B01D2257/708B01D2257/704B01D2259/80B01J35/39B01J35/615
Inventor 陈志鸿吕海钦孟庆国苑明哲
Owner SHENYANG INST OF AUTOMATION GUANGZHOU CHINESE ACAD OF SCI
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