CN101319478A - Preparation method and application of a composite paper-based material with functions of adsorbing and degrading organic matter - Google Patents

Abstract

The invention relates to a preparation method and application of a composite paper-based material with the function of adsorbing and degrading organic matter. The material consists of 30-50% metal oxide powder, 15-35% adsorbent powder, 0-25% Inorganic fiber, 10-30% pulp, 0.5-5% binary retention aid. During preparation, the metal oxide powder, adsorbent powder, inorganic fiber and pulp are prepared into a suspension with a concentration of 2-8%, and it is decomposed for 5-30 minutes; then it is diluted to 0.5% after adding a binary retention aid to form Wet cardboard; press and dry to obtain composite paper base material. The prepared composite paper-based material is further processed into paper components, and placed in a low-concentration volatile organic compound environment with a light source to achieve continuous photocatalytic degradation. The paper-based material of the invention solves the problems of high cost of preparing composite catalytic materials by using zeolite as a carrier, and powderization of granular materials due to friction, and has adsorption effect on low-concentration volatile organic gases.

Description

Preparation method and application of a composite paper-based material with functions of adsorbing and degrading organic matter

technical field

The invention relates to a preparation method of a composite material with photocatalytic function, specifically to prepare a composite paper-based material capable of absorbing and degrading low-concentration volatile organic compounds, and belongs to the field of material science.

Background technique

At present, there are a large number of low-concentration volatile organic pollution sources in the space where people live and work, such as volatile organic solvents in shoe factory adhesives, harmful gas (formaldehyde, benzene) pollution from interior decoration, etc., which seriously endanger people's health. healthy. In recent years, the application of titanium dioxide and other metal oxide heterogeneous photocatalytic reactions to treat low-concentration volatile organic compounds has become one of the most active research directions in the environmental field and inorganic material science, but large-scale commercial applications or products are still rare. This can be attributed to two reasons: (1) The consolidation technology of titanium dioxide and other metal oxide powders has not been solved. When metal oxide powders such as titanium dioxide photocatalytically degrade volatile organic compounds, it is easy to cause problems such as a sharp loss of airflow pressure in the reactor and obstruction of light radiation. Judging from the situation of literature retrieval, there have been many reports at home and abroad on the preparation of metal oxide composite catalytic materials using zeolite, glass, single crystal silicon, conductive glass, etc., but the preparation costs of these methods are high. There are still problems in the reactor that cause airflow pressure loss, light radiation is blocked, and there is also the problem of powdering due to friction between granular materials. (2) The photocatalytic degradation rate of metal oxide powders such as titanium dioxide to low-concentration volatile organic gases is slow, mainly because the concentration of low-concentration volatile organic compounds on the surface of titanium dioxide powder is small.

Wu Zonghua of Fujian Normal University recently developed a new papermaking process (Chen Wanchun, Chen Najie, Lu Yudong, Wu Zonghua, Paper Chemicals, 2006, 18 (2), 45; Chen Wanchun, Chen Najie, Lu Yudong, Wu Zonghua, Paper Science and Technology, 2006 , 25(1), 24; Chen Najie, Chen Shaoping, Lu Yudong, Chen Wanchun, Wu Zonghua, Nonmetallic Minerals, 2006, 29(5), 6), this process can prepare inorganic matter content of more than 90%, inorganic powder up to 60% Functional composite paperboard with high inorganic powder content above %. Applying this technique, a method for photocatalytic degradation of low-concentration VOCs using metal oxide-adsorbent composite paperboard was invented.

Contents of the invention

The purpose of the present invention is to provide a composite paper-based material composed of metal oxide powder with photocatalytic function, adsorbent powder, inorganic fiber and pulp and its application to photocatalytic degradation of low-concentration volatile organic compounds.

In order to achieve the above object, the concrete technical scheme adopted in the present invention is:

1. Material composition

30-50% of metal oxide powder, 15-35% of adsorbent powder, 0-25% of inorganic fiber, 10-30% of pulp, and 0.5-5% of binary retention aid. The stated percentages are by dry weight of the material.

2. Material preparation

Add water to metal oxide powder, inorganic fiber, adsorbent powder and pulp to form a 2-8% suspension, decompose it with a decomposer for 5-30 minutes, and pour it into a beaker; add cationic polymer while stirring, and stir for 3 minutes Then add anionic polyacrylamide, add water to dilute the suspension to 0.5%, and copy the wet cardboard on the paper scraper. After the wet paperboard is pressed, it is dried at 105° C. to 125° C. to obtain the composite paper base material of the present invention.

3. Material application

The prepared composite paper-based material is further processed into honeycomb or small block-shaped various paper components, and placed in a low-concentration volatile organic compound environment with natural light sources or artificial ultraviolet light sources to achieve low-concentration volatile organic compounds. Adsorption and continuous photocatalytic degradation.

The metal oxide powder in the present invention is one of titanium dioxide, zinc oxide or copper oxide powder, or a mixture thereof in any proportion.

The adsorbent powder in the present invention is one of zeolite, diatomaceous earth, activated carbon or bamboo charcoal, or a mixture thereof in any proportion.

The inorganic fiber described in the present invention is a kind of ceramic fiber or glass fiber, or a mixture thereof in any proportion.

The pulp described in the present invention is one of softwood chemical pulp, hardwood chemical pulp or straw pulp, or a mixture thereof in any proportion.

The binary retention aid of the present invention is composed of anionic polyacrylamide and cationic high polymer, wherein the cationic high polymer is polydimethyldiallylammonium chloride, cationic starch or polyvinylamine one or a mixture thereof.

The paper sheet extractor of the present invention is one of a paper sample extractor, a cylinder machine or a low-speed fourdrinier machine.

A large amount of inorganic powders such as calcium carbonate and titanium dioxide are used in the paper industry. However, due to the low retention rate of inorganic powders, it not only causes a lot of waste of raw materials, but also pollutes water quality and increases the burden on water treatment. Therefore, the maximum amount of inorganic powders used should not exceed 30%. The content of inorganic powder in the composite paperboard provided by the invention can reach more than 60%, and the retention rate of inorganic powder can reach more than 90% during manufacture. The development and application of the paper (board) provides a high-efficiency and low-cost preparation method with broad application prospects.

The components further processed by the composite paper-based material provided by the present invention effectively solve the problems of blocked light radiation caused by metal oxide powders such as titanium dioxide, and also solve the problem of using zeolite, glass, single crystal silicon, conductive glass, etc. as carriers. The preparation cost of titanium dioxide and other metal oxide composite catalytic materials is high, and the problems of powdering between granular materials due to friction. In addition, it has an adsorption effect on low-concentration volatile organic gases, greatly increases the concentration of organic gases on the surface of titanium dioxide powder, improves the photocatalytic degradation speed, and realizes the large-scale commercialization of continuous photocatalytic degradation of low-concentration volatile organic compounds. application.

Detailed ways

The technical scheme of the present invention will be further described below in conjunction with specific embodiments:

Example 1:

Take 0.8 grams of eucalyptus chemical pulp, 2.0 grams of ceramic fiber, 3.8 grams of anatase titanium dioxide and 1.0 grams of zeolite, add water to make a 5% suspension, and pour it into a beaker after 10 minutes with a decomposer; while stirring Add 0.08 g of polydimethyldiallyl ammonium chloride, stir and absorb for 3 minutes, then add 0.12 g of anionic polyacrylamide, add water to dilute the suspension to 0.5%, and wet the cardboard on a paper sampler. Press the wet paperboard and dry it at 105°C to obtain the composite paper base material of the present invention.

Example 2:

Get the mixed pulp of 0.6 gram of wheat straw pulp and 0.4 gram of masson pine chemical pulp, 3.0 gram of ceramic fiber, 3.0 gram of anatase titanium dioxide and 1.0 gram of rutile titanium dioxide, 1.0 gram of zeolite and 0.6 gram The mixed adsorbent of activated carbon is mixed with water to form an 8% suspension, which is decomposed by a decomposer for 15 minutes and then poured into a beaker; while stirring, add 0.15 grams of polydimethyldiallyl ammonium chloride, stir and absorb for 3 minutes and then add 0.25 grams of anionic polyacrylamide, add water to dilute the suspension to 0.5%, and wet the cardboard on a paper sampler. Press the wet paperboard and then dry it at 115°C to obtain the composite paper base material of the present invention.

Example 3:

Get the mixed pulp of 0.6 gram of eucalyptus chemical pulp and 0.4 gram of spruce chemical pulp, the mixture of 1.5 gram of ceramic fiber and 1.5 gram of glass fiber, the mixed powder of 3.0 gram of anatase titanium dioxide and 1.0 gram of copper oxide , 1.0 gram of zeolite and 0.5 gram of bamboo charcoal mixed adsorbent, add water to make 2% suspension, pour it into a beaker after 20 min with a decontamination machine; add 0.1 gram of polydimethyldiallyl chloride while stirring Ammonium chloride and 0.15 g of cationic starch, after stirring for 3 minutes, add 0.25 g of anionic polyacrylamide, add water to dilute the suspension to 0.5%, and wet the cardboard on a paper sample machine. Press the wet paperboard and then dry it at 115°C to obtain the composite paper base material of the present invention.

Example 4:

Take 1.5 grams of masson pine chemical pulp, 2.0 grams of glass fiber, 4.0 grams of zinc oxide and 2.2 grams of activated carbon, add water to make a 2% suspension, and pour it into a beaker after 20 minutes with a decomposer; while stirring, add 0.1 Add 0.2 g of anionic polyacrylamide to 0.2 g of polydimethyldiallyl ammonium chloride after stirring for 3 minutes, add water to dilute the suspension to 0.5%, and wet the cardboard on a paper sampler. Fold the wet cardboard into a corrugated shape, fix it with sodium silicate solution, and burn it at 500°C for 30 minutes to obtain a honeycomb structure after setting. The components are placed in an environment with an ultraviolet light intensity of 0.5mW/cm ² , and each square meter of composite cardboard can degrade 0.5 grams of toluene gas with a concentration of 10 micrograms per liter per hour.

Example 5:

Take 1.5 grams of wheat straw pulp, 1.0 grams of ground pine chemical pulp, 1.1 grams of ceramic fiber, 4.0 grams of copper oxide and 3.2 grams of diatomaceous earth, add water to make a 3% suspension, and pour it into Beaker; add 0.05 g of polyvinylamine while stirring, add 0.15 g of anionic polyacrylamide after stirring for 3 minutes, add water to dilute the suspension to 0.5%, and take a wet cardboard on a paper sampler. Fold the wet cardboard into a corrugated shape, fix it with alumina sol, and burn it at 500°C for 30 minutes to obtain a honeycomb structure after shaping. Put the components in an environment with an ultraviolet light intensity of 0.5mW/cm ² , and each square meter of composite paperboard can degrade 1.5 grams of formaldehyde gas with a concentration of 20 micrograms per liter per hour.

Embodiment 6:

Get the mixed slurry of 2.0 grams of reed pulp and 2.0 grams of masson pine chemical pulp, the mixed powder of 1.8 grams of titanium dioxide and 1.8 grams of zinc oxide, the mixed adsorbent powder of 2.1 grams of zeolite and 2.1 grams of diatomaceous earth, add water Prepare a 2% suspension, and pour it into a beaker after thawing with a decomposer for 5 minutes; add 0.45 grams of cationic starch while stirring, add 0.15 grams of anionic polyacrylamide after stirring for 3 minutes, add water to dilute the suspension to 0.5%, Wet cardboard is copied on the paper pattern picker. Fold the wet cardboard into a corrugated shape, fix it with alumina sol, and burn it at 500°C for 30 minutes to form a honeycomb structure. The component is placed in an environment with an ultraviolet light intensity of 0.5mW/cm ² of cardboard, and each square meter of composite cardboard can degrade 1.7 grams of pentane gas with a concentration of 20 micrograms per liter per hour.

Claims (7)

1, a kind of preparation method and application thereof with composite paper based material of absorption and degradation of organic substances function is characterized in that:

Form

Metal-oxide powder 30～50%, adsorbent powder 15～35%, inorfil 0～25%, paper pulp 10～30%, binary retention agent 0.5～5%, described percentage are material oven dry weight percentage;

Preparation

It is 2～8% suspension that metal-oxide powder, adsorbent powder, inorfil and paper pulp are mixed with concentration expressed in percentage by weight, discongests 5～30min with fluffer; Adding the suspension dilution that water will have been prepared after the binary retention agent again is 0.5%, forms the l Water Paper plate; After squeezing,, promptly obtain composite paper based material in oven dry;

Use

The composite paper based material for preparing is placed the low concentration volatile organic matter environment, can realize organic absorption and continuous light catalytic degradation.

2. preparation method and the application thereof with composite paper based material of absorption and degradation of organic substances function according to claim 1 is characterized in that described metal-oxide powder is titanium dioxide, zinc oxide or cupric oxide powder, or its mixture.

3, preparation method and the application thereof with composite paper based material of absorption and degradation of organic substances function according to claim 1 is characterized in that described adsorbent powder is zeolite, diatomite, active carbon or bamboo charcoal, or its mixture.

4, preparation method and the application thereof with composite paper based material of absorption and degradation of organic substances function according to claim 1 is characterized in that described inorfil is ceramic fibre or glass fibre, or its mixture.

5, preparation method and the application thereof with composite paper based material of absorption and degradation of organic substances function according to claim 1, it is characterized in that described paper pulp is a kind of of needlebush chemical pulp, leaf wood chemical pulp or straw pulp, or the mixture of its arbitrary proportion.

6, preparation method and the application thereof with composite paper based material of absorption and degradation of organic substances function according to claim 1, it is characterized in that described binary retention agent is the binary retention agent that anion-polyacrylamide and cationic high polymer constitute, wherein cationic high polymer is PDDA, cationic starch or polyvinylamine, or its mixture.

7, a kind of preparation method and application thereof with composite paper based material of absorption and degradation of organic substances function, it is characterized in that the composite paper based material that will prepare further is processed into the paper member of cellular or tiny bulk, place the environment of the low concentration volatile organic matter that has lamp or artificial ultraviolet source, can realize continuous adsorption and photocatalytic degradation.