CN102580688A - Adsorbing material for removing indoor formaldehyde gas - Google Patents

Abstract

The invention discloses an adsorption material for removing indoor formaldehyde gas, which is made of the following raw materials in parts by weight: 5-8 parts of tannin, 2-5 parts of collagen fibers, and 3-8 parts of cross-linking agent. The preparation method is as follows: firstly add persimmon powder and cowhide collagen fiber into distilled water and stir to dissolve; add a crosslinking agent to adjust the pH value to 6-7; then heat the reactant in a water bath, filter, dry and pulverize to obtain Adsorbent material capable of adsorbing formaldehyde gas. The adsorption material prepared by this method has the advantages of low cost, good physical stability, remarkable adsorption effect on formaldehyde, no secondary pollution to the environment, and can be widely used in the removal of formaldehyde gas pollutants in indoor or public places.

Description

A kind of adsorption material for removing indoor formaldehyde gas

technical field

The invention belongs to the technical field of indoor air purification, in particular to an adsorption material for removing indoor formaldehyde gas.

Background technique

With the rapid development of the economy and the continuous improvement of people's living standards, more and more attention has been paid to the decoration of houses. Modern families are increasingly using materials that are prone to harmful gases such as decorations, wooden floors, wall materials, and furniture. These The most common gas pollutant is formaldehyde gas. Formaldehyde is a colorless gas with a strong pungent smell, which is in a gaseous state at room temperature. On the list of priority control of toxic chemicals in China, formaldehyde ranks second. It is a highly toxic substance and one of the potential strong teratogenic and carcinogenic substances. Generally, formaldehyde in newly renovated houses will exceed the standard. The Chinese people The national standard of the Republic "Hygienic Standards for Formaldehyde in Indoor Air" stipulates that the maximum allowable concentration of formaldehyde in indoor air is 0.08mg/m ³ , and the concentration of formaldehyde in the indoor air of newly renovated houses can often reach above 1mg/m ³ . Some even have 5mg~8mg/m ³ . Formaldehyde is easy to volatilize, release for a long time, and cause great harm. It has become a problem that cannot be ignored in people's daily life. At present, the methods for removing such harmful substances mainly include: one is physical adsorption method, such as activated carbon with porous structure and large specific surface area, which absorbs formaldehyde on the material to remove formaldehyde. Although activated carbon is not expensive, it needs to be replaced frequently. The second is chemical methods. Chemical air treatment products are mainly obtained through artificial synthesis, and many of them are aromatic compounds. Almost all aromatic compounds contain benzene ring compounds that have been proven or suspected to be carcinogens. In addition, many chemical products are oxidative and corrosive, which are easy to cause damage to the utensils, as well as the operators and residents. Closed and concealed products When the coating film ages and the weather is hot, humid, etc., the film is prone to damage, and harmful substances such as formaldehyde will be released, becoming a hidden "time bomb" in the family. The third is a product that uses the principle of photocatalysis. Some catalysts are coated on the adsorption material, and formaldehyde is oxidized by sunlight and oxygen in the air. Photocatalysts currently on the market are such products, and the treatment cost per square meter is about 20 yuan. , the price is more expensive. The fourth is the plant method. Many plants have the function of absorbing harmful gases such as formaldehyde, such as Chlorophytum, Sansevieria, Ivy, Aloe, etc., to convert formaldehyde into other substances, but this absorption is not stable and the processing speed is relatively slow. The above-mentioned materials and methods all have a certain effect on removing formaldehyde, but there are also limitations such as easy adsorption saturation, poor reproducibility, and high cost of use.

Contents of the invention

The technical problem to be solved by the present invention is to provide an ecological formaldehyde gas adsorption material with relatively simple preparation process, strong adsorption effect, convenient use, low cost and non-toxicity.

The technical solution for realizing the object of the present invention is: based on the fact that persimmon powder contains a large amount of tannin molecules, formaldehyde is removed by condensation reaction of polyphenols and aldehyde groups contained in tannins.

An adsorption material for removing indoor formaldehyde gas, which is made of the following raw materials in parts by weight: 5-8 persimmon powder, 2-5 cowhide collagen fibers, and 3-8 crosslinking agents. Its preparation method comprises the following steps:

(1) Add persimmon powder and cowhide collagen fibers into distilled water and stir to dissolve;

(2) Add a cross-linking agent to adjust the pH value to 6~7;

(3) heating the reactant obtained in step (2) in a water bath;

(4) After filtering, drying and pulverizing, the adsorption material capable of adsorbing formaldehyde gas can be obtained.

The persimmon powder and cowhide collagen fibers described in the step (1) are prior art.

The crosslinking agent described in step (2) is an aqueous glutaraldehyde solution with a mass percentage of 25%.

The temperature of the water bath described in step (3) is 50° C., and the time of the water bath is 3 hours.

The drying temperature in step (4) is 60° C. and the drying time is 12 hours.

The present invention has the following advantages and characteristics

Tannin is easily soluble in water and polar organic solvents, so it is difficult to be directly used in the treatment of formaldehyde waste liquid or gas, and this kind of persimmon tannin, which is solidified by glutaraldehyde on the collagen fiber substrate, is insoluble in water and The characteristics of various organic solvents; the thermal denaturation temperature measured by differential scanning calorimeter (DSC) is 156~175°C, that is, it has good thermal stability, and the use conditions are not affected by temperature; as an adsorbent because of its The source is animal and plant components, and will not pollute the environment; it also has low cost, fast adsorption speed, and large capacity; it is a new type of high-efficiency adsorption material with great market development prospects, and can be widely used indoors, especially house decoration Finally, the removal of formaldehyde gas volatilized by decorative materials, furniture, floors, etc.

Detailed ways

The present invention will be further described below through a specific embodiment and an application example.

A preparation method for an adsorbent material for removing indoor formaldehyde gas, comprising the steps of:

Add 60g of persimmon powder and 15g of cowhide collagen fibers to 1000ml of distilled water, and stir and react at 25°C for 20 hours; add 22.5ml of 25% glutaraldehyde aqueous solution for laboratory use, and stir and react at 25°C for 1 hour; , use a pH tester to measure the pH of the solution as 5.0; then adjust the pH to 6.4 with 1mol/L NaOH aqueous solution, then put the reactant into a three-necked flask, and react in a water bath at 50°C for 3 hours; take it out with a circulating water formula Vacuum filtration by a vacuum pump, and vacuum drying at 60°C for 12 hours to obtain 60 g of adsorbent material capable of adsorbing formaldehyde gas;

Application Example 1

(1) Take 2g of the prepared formaldehyde gas adsorption material, after fully grinding, use a 100-mesh sieve to screen out particles with small particle size and large specific surface area. Dilute the formaldehyde solution purchased from the market with a content of 36-38% to about 1ml of solution equivalent to 1mg of formaldehyde, and use the iodometric method to calibrate its exact concentration to 0.98mg/ml, and react the calibrated formaldehyde solution with a phenol reagent, Generate oxazine, which is oxidized by iron ions in acidic solution to form a blue-green compound, develop color after 15 minutes at room temperature, then colorimetrically quantify, use phenol reagent spectrophotometry to make its concentration-absorbance standard curve, and measure its maximum absorption The wavelength is 630nm;

(2) Use a beaker to measure 50ml of formaldehyde standard solution with a concentration of 0.98mg/ml, put them in two airtight glass containers, place 5g of solidified tannin adsorbent evenly on the bottom of one group, and make the other group For the blank control, put the two groups of containers in an incubator at room temperature (25°C) to make them statically adsorb formaldehyde gas, take out the two groups of formaldehyde solutions after 12 hours, and react with the phenol reagent to form blue Color compounds, colorimetric quantification, found that the color of the adsorbent group was significantly lighter than the blank group, indicating that the concentration of formaldehyde was significantly reduced, measured the solution volume and absorbance after adsorption, and calculated its concentration by the standard curve, by Q=(C ₀ ×V ₀ -C ₁ ×V ₁ )/m, it is calculated that 10.7 mg of formaldehyde is adsorbed per gram of adsorbent.

Application Example 2

According to the operation method of application example 1, the difference is: the sieve aperture selected after grinding the obtained adsorbent material is changed to 150 mesh, and its absorbance is measured by phenol reagent spectrophotometry, and according to the formaldehyde standard curve that has been made, calculate It is obtained that 11.3 mg of formaldehyde is adsorbed per gram of the adsorbent material.

Application Example 3

According to the operation method of application example 1, the difference is: the sieve aperture selected after grinding the obtained adsorbent material is changed to 200 mesh, and its absorbance is measured by phenol reagent spectrophotometry, and according to the formaldehyde standard curve that has been made, calculate It is obtained that 12.8 mg of formaldehyde is adsorbed per gram of the adsorbent material.

Application Example 4

According to the operation method of Application Example 1, the difference is that only the temperature of the incubator is changed to 30°C to speed up the volatilization of formaldehyde, and the absorbance is still measured by phenol reagent spectrophotometry, and according to the established formaldehyde standard According to the curve, it is calculated that 10.8 mg of formaldehyde is adsorbed per gram of the above-mentioned adsorbent material.

Application Example 5

According to the operation method of application example 1, the difference is: only the temperature of the incubator is changed to 35°C to speed up the volatilization of formaldehyde, and the absorbance is still measured by phenol reagent spectrophotometry, and according to the established formaldehyde standard According to the curve, it is calculated that 11.5 mg of formaldehyde is adsorbed per gram of the above-mentioned adsorbent material.

Application Example 6

According to the operation method of application example 1, the difference is: only change the time of static adsorption into 24h, measure its absorbance with phenol reagent spectrophotometry, and according to the formaldehyde standard curve that has been made, calculate and obtain above-mentioned every gram of adsorption material adsorption Formaldehyde was 13.2mg.

Application Example 7

According to the operation method of application example 1, the difference is: only change the time of static adsorption to 36h, measure its absorbance with phenol reagent spectrophotometry, and according to the formaldehyde standard curve that has been made, calculate and obtain above-mentioned every gram of adsorption material adsorption Formaldehyde was 14.9mg.

Claims (5)

1. sorbing material of removing indoor formaldehyde gas, it is characterized in that: it is processed by following raw material by weight: tannin 5 ~ 8, collagenous fibres 2 ~ 5, crosslinking agent 3 ~ 8.

2. the described a kind of sorbing material of removing indoor formaldehyde gas of claim 1, it is characterized in that: the preparation method comprises the steps:

(1) persimmon powder and cattle-hide collagen fibers are joined stirring and dissolving in the distilled water;

(2) add crosslinking agent, regulate pH value to 6 ~ 7;

(3) step (2) gained reactant is carried out the water-bath heating;

(4) promptly obtain the sorbing material of ability absorbing formaldehyde gas after filtering, dry, pulverizing.

3. sorbing material according to claim 1 and 2 is characterized in that: the said crosslinking agent of step (2) is that mass percent is 25% glutaraldehyde water solution.

4. sorbing material according to claim 2 is characterized in that: the described water bath heating temperature of step (3) is 50 ℃, and the water-bath time is 3 hours.

5. sorbing material according to claim 2 is characterized in that: the described bake out temperature of step (4) is 60 ℃, and the time is 12 hours.