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A kind of preparation method of indoor formaldehyde efficient adsorbent

An adsorbent and high-efficiency technology, applied in chemical instruments and methods, other chemical processes, etc., can solve the problems of underdeveloped utilization value, low degree of application, waste of resources, etc., and achieve high-efficiency synergy, low mass ratio, The effect of improving adsorption performance

Active Publication Date: 2018-01-23
SUN YAT SEN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] As a big country in agriculture and forestry, most of the agricultural and forestry wastes in China, such as a large amount of rice husks, buckwheat husks and low-grade tea, tea powder and other agricultural wastes produced in agricultural production, as well as a large number of forestry wastes such as pine cones that fall in forestry applications, are mostly burned directly. Or the way of discarding randomly, the application degree is very low, and the utilization value has not been fully developed, which not only causes waste of resources, but also pollutes the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0026] A preparation method of indoor high-efficiency formaldehyde adsorbent includes the following steps:

[0027] 1) Break the tea, rice husk, buckwheat husk and pine cone respectively;

[0028] 2) Remove impurities and put them in an oven to fully dry;

[0029] 3) Put the pine cone dried in step 2) into the carbonization furnace, and carbonize and activate to obtain a carbonized pine cone;

[0030] 4) Add the dried rice husks and buckwheat husks dried in step 2) to saturated sodium carbonate solution, soak for 2 to 5 hours, filter and air dry, then add to the carbonization furnace, carbonize and activate to obtain carbonized activated rice husks and buckwheat husks ;

[0031] 5) Mixing the dried tea leaves, carbonized activated pine cones, carbonized activated rice husks and carbonized activated buckwheat husks uniformly in step 2) to obtain an adsorbent.

[0032] Preferably, the particle size of the broken tea leaves and pine cones after step 1) is 3-10 mm, and the particle size of ...

Embodiment 1

[0041] 1) Crush the tea leaves and pine cones to a particle size of 3-10mm, and crush rice husks and buckwheat husks to a particle size of 2-5mm;

[0042] 2) Remove sand, stones and other impurities, put it in a drying oven at 110°C for 6 hours, take it out and cool it to room temperature naturally;

[0043] 3) Put the dried pine cone in step 2) into the carbonization furnace, and the furnace temperature is 450°C for carbonization and activation for 1.5 hours, and then naturally cooled to room temperature to obtain a carbonization and activation pine cone;

[0044] 4) Add the dried rice husks and buckwheat husks in step 2) to saturated sodium carbonate solution for 2 hours, filter and air dry, and then put them into the carbonization furnace. The furnace temperature is 450℃ for carbonization and activation for 1.5 hours, and it is naturally cooled to room temperature to obtain carbonization. Activated rice husk and buckwheat husk;

[0045] 5) After step 2), the dried tea leaves, carbo...

Embodiment 2

[0051] The same as the operating method of Example 1, the carbonization activation conditions of step 3) and step 4) were changed to: 300°C carbonization activation for 3 hours.

[0052] After determination: the formaldehyde concentration is 0.720±0.040mg / m 3 When the formaldehyde adsorbent per unit mass can reach 3.90±0.41μg / g in 150 minutes, the initial concentration of formaldehyde is 0.720±0.040mg / m 3 Reduce to national standard 0.1mg / m 3 , It takes about 140 minutes;

[0053] The formaldehyde concentration is 0.298±0.045mg / m 3 When the formaldehyde adsorbent per unit mass can reach 1.55±0.34μg / g in 120 minutes, the initial concentration of formaldehyde is 0.298±0.045mg / m 3 Reduce to national standard 0.1mg / m 3 , It takes about 45 minutes.

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Abstract

The invention discloses a method for preparing an efficient indoor formaldehyde adsorbent. The method includes the following steps: 1) respectively smashing tea leaves, rice hulls, buckwheat hulls and cones of lacebark pine; 2) removing impurities, and placing the raw materials in a drying oven for drying; 3) carbonizing and activating the cones of lacebark pine dried in the step 2) to obtain the carbonized and activated cones of lacebark pine; 4) soaking the rice hulls and buckwheat hulls dried in the step 2) with saturated sodium carbonate solution for 2-5 h, and sequentially performing filtration, air drying and carbonization and activation to obtain the carbonized and activated rice hulls and buckwheat hulls; 5) uniformly mixing tea leaves dried in the step 2), carbonized and activated cones of lacebark pine, carbonized and activated rice hulls and carbonized and activated buckwheat hulls, so as to obtain the adsorbent. The adsorbent provided by the invention is high in adsorption capacity, big in adsorption quantity, high in rate and low in cost, realizes resource utilization and turns waste into wealth as the raw materials are agricultural and forestal wastes such as waste tea leaves, rice hulls, buckwheat hulls and cones of lacebark pine, and fully combines the adsorptive property with medicinal value of materials.

Description

Technical field [0001] The invention relates to a preparation method of an indoor formaldehyde efficient adsorbent. Background technique [0002] With the advancement of modernization, people pay more and more attention to the beautification and improvement of the environment such as rooms and offices, but the indoor air pollution caused by decorative materials is often ignored. According to a survey by relevant US environmental agencies, most people spend about 60% to 90% of their time indoors every day. Therefore, the quality of indoor air has a great impact on human health. As one of the main indoor pollutants, formaldehyde (HCHO) ranks second in the priority control list of toxic chemicals in my country, which seriously threatens human health. At the same time, indoor formaldehyde pollution has the characteristics of long release cycle, wide sources, and great harm. The adsorption method has become a clean room due to its advantages of low energy consumption, strong enrichme...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/30B01J20/24B01D53/02
Inventor 张淑娟谢子钊江浩芝
Owner SUN YAT SEN UNIV
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