CN105289292A

CN105289292A - Air purifying agent and preparation method thereof

Info

Publication number: CN105289292A
Application number: CN201510844934.8A
Authority: CN
Inventors: 韦昱灵
Original assignee: Individual
Current assignee: Individual
Priority date: 2015-11-28
Filing date: 2015-11-28
Publication date: 2016-02-03

Abstract

The invention belongs to the technical field of functional materials and discloses an air purifying agent. The air purifying agent comprises the following ingredients in parts by weight: 50-90 parts of tetrabutyl titanate, 2-10 parts of tetraethoxysilane, 20-40 parts of chitin nano-fibers, 3-10 parts of polyvinyl alcohol, 200-500 parts of anhydrous ethyl alcohol and 10-50 parts of water. According to the air purifying agent, as silicon dioxide is uniformly doped, clustering of TiO2 with time increase due to high surface energy is avoided, and the long-time stable photocatalysis activity is maintained; by virtue of the action of polyvinyl alcohol, uniform tiny micropores are formed in the compact surface of TiO2, so that surface clustering of TiO2 is avoided to a certain extent; due to adsorption of the chitin nano-fibers, the concentration of pollutants on the surface is increased, so that a proceeding foundation is provided for smooth photocatalysis of TiO2.

Description

A kind of air purifying preparation and preparation method thereof

Technical field

The invention belongs to technical field of function materials, relate to a kind of cleanser, particularly relate to a kind of air purifying preparation and preparation method thereof.

Background technology

In recent years, along with the fast development of China's city industrialization, atmosphere pollution is day by day serious, and air quality worsens further, not only jeopardizes the normal life of people, and works the mischief to the physical and mental health of people.The IAQ closely bound up with people also makes people worried, particularly this year is along with the extensive use of architectural decorative and fitting materials, various material discharges a large amount of harmful substance (as: volatile organic contaminant such as formaldehyde, toluene, benzene) severe contaminations indoor air environment, and then to the healthy of the mankind and operating efficiency important.How to remove efficiently as the volatile organic compounds such as formaldehyde, toluene, benzene become researcher pay close attention to focus, utilizing the functional material of some modifications optionally to carry out harmless treatment to volatile organic compound as catalyst or adsorbent becomes the most effective approach.

The minimizing technology of volatile organic compound mainly contains the methods such as active carbon adsorption, the woody plant method of purification, electrostatic precipitation, photocatalysis, and wherein, people are for TiO ₂large quantifier elimination has been carried out in photocatalysis, becomes research emphasis and the focus of current photocatalysis field.TiO ₂photochemical catalyst, the organic matter that its degradable is a large amount of, as benzene,toluene,xylene, naphthalene, halogenated aryl hydrocarbon, formaldehyde, NO _x, ammonia, hydrogen sulfide, tetrachloro-ethylene, carbon monoxide etc.TiO ₂photocatalytic mechanism be when illumination, an electronics (e in its valence band ^-) will be excited, when crossing forbidden band and entering conduction band, then in valence band, produce corresponding hole (h ⁺).And this photohole has very strong oxidability (its standard hydrogen electrode current potential is at 1.0-3.5V), thus at TiO ₂define redox system on the surface, this redox system almost can be oxidized all Organic Pollutants, and they are completely oxidized to CO ₂and H ₂o, and can not secondary pollution be produced.

But TiO ₂also there are some shortcomings in photocatalysis, this is because in light catalytic purifying field, usual pollutant levels are lower, and TiO ₂itself there is no adsorption capacity, therefore needs extra carrier to be adsorbed onto on the surface by pollutant, thus by TiO ₂catalytic decomposition.In addition, due to TiO ₂there is high surface energy and be highly susceptible to occurring surface reunion, thus as time goes by, significantly reducing its photocatalytic activity.In order to overcome these defects, people have developed multiple supported titanium ₂material for air purification, such as active carbon, silica gel, Woelm Alumina, NACF etc. carry out load.But up to now, for use chitin nano fiber load TiO ₂material for air purification, had not yet to see report.Meanwhile, for the supported titanium that exploitation is new ₂material for air purification still has eager demand and requirement, is also one of research topic of air purification field.

Summary of the invention

Goal of the invention of the present invention is the technical problem for above-mentioned existence, provides a kind of air purifying preparation and preparation method thereof.

The technical solution used in the present invention is as follows:

A kind of air purifying preparation, described air purifying preparation comprises following component, each component by weight:

The present invention also provides a kind of preparation method of air purifying preparation, said method comprising the steps of:

Mixed according to following proportioning by raw material, stir, normal temperature leaves standstill 5-10h, prepares colloidal sol;

(2) add 20-40 part chitin nano fiber in the colloidal sol obtained in step (1), ultrasonic disperse, ageing under room temperature, then at 80-100 DEG C of dry 4-8h, obtain air purifying preparation.

Preferably, the digestion time described in step (2) is 24-48h.

In sum, owing to have employed technique scheme, the invention has the beneficial effects as follows:

1. prepare nano silicon dioxide sol by ethyl orthosilicate, by Uniform Doped silica, avoid TiO ₂prolongation in time and because of high surface energy occur agglomeration, maintain long light stable catalytic activity;

2. by the use of polyvinyl alcohol, at TiO ₂compact surfaces on define uniform tiny micropore, also overcome TiO to a certain extent ₂surface reunite;

3. by the absorption of chitin nano fiber, increasing the pollutant levels on its surface, is TiO ₂smooth photochemical catalyst provide the basis of carrying out.

By these means and process, final material for air purification is made to have good degradation efficiency and time stability to the organic pollution in air.

Detailed description of the invention

The technological means realized to make the present invention, creation characteristic, reaching object and effect is easy to understand, below in conjunction with embodiment, setting forth the present invention further.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.

Embodiment 1

Various raw material is taken according to hereinafter described ratio of quality and the number of copies:

A preparation method for above-mentioned air purifying preparation, comprises the following steps:

(1) add tetraethyl titanate, ethyl orthosilicate and polyvinyl alcohol by weight, then add absolute ethyl alcohol and distilled water, stir, be made into homogeneous solution, normal temperature leaves standstill 5h, obtains colloidal sol;

(2) add chitin nano fiber by the colloidal sol obtained in step (1), then ultrasonic disperse, ageing 24 under room temperature, then at 80 DEG C of dry 8h, obtain air purifier material.

Embodiment 2

Embodiment 3

Embodiment 4

Comparative example 5

Add tetraethyl titanate, ethyl orthosilicate and polyvinyl alcohol by weight, then add absolute ethyl alcohol and distilled water, stir, be made into homogeneous solution, normal temperature leaves standstill 8h, obtains colloidal sol; Then ultrasonic disperse, ageing 32h under room temperature, then at 90 DEG C of dry 6h, obtains air purifier material.

Test air purifying preparation prepared by embodiment 1-4 and comparative example 5, the main air purifying preparation that measures is to the degradation property of pollutant and stability.Test result is as shown in table 1.

Method of testing is: in the closed container filling benzene, formaldehyde, ammonia, hydrogen sulfide, NO respectively, initial concentration is 100mg/l, above-mentioned obtained various materials are tested respectively to the degradation property of organic pollution under ultraviolet lamp irradiates, use chromatographic pollutant residual concentration after 30 minutes, thus can palliating degradation degree be learnt.

Table 1

Claims

1. an air purifying preparation, is characterized in that, described air purifying preparation comprises following component, each component by weight:

。

2. a preparation method for air purifying preparation, is characterized in that, said method comprising the steps of:

(1) mixed according to following proportioning by raw material, stir, normal temperature leaves standstill 5-10h, prepares colloidal sol;

3. the preparation method of a kind of air purifying preparation according to claim 2, is characterized in that: the digestion time described in step (2) is 24-48h.