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Porous silica gel air purifying particles and preparation method thereof

An air purification and porous silica gel technology, which is applied in the field of porous silica gel air purification particles and their preparation, can solve problems such as air pollution control in seldom residential environments, and achieve the effects of developed pores, mature technology and high purity

Active Publication Date: 2015-01-07
福建省宇诚环保科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Silica gel is mainly made of alkali metal silicate or organic silicon source, and is prepared by gel method, such as the preparation process of Chinese patent high-purity silica gel (CN 102079526), ​​a porous silica based on silicate (CN101885488), U.S. patent (US 6103004), etc. However, this silica gel is mainly used for industrial purposes, and it is rarely used directly for the control of air pollution in residential environments

Method used

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  • Porous silica gel air purifying particles and preparation method thereof

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preparation example Construction

[0029] The present invention is a kind of preparation method of porous silica gel air purification particle, comprises the following steps:

[0030] 1. Add the bottom liquid and surfactant in the reactor 5 in advance, keep stirring and control the temperature at 25-80 o C: inject water glass solution and sulfuric acid solution into the reactor 5 after heating, and control the pH value in the reactor 5 to be 4-10. The surfactant is selected from one or more of polyethylene glycol, ammonium bicarbonate, polyethylene glycol stearate, alkylsulfonic acid amine, castor oil polyoxyethylene ether; by mass percentage The surfactant is 0.01-5% of the water glass solution. The mass concentration of the water glass solution is 5-25%, and the modulus is 3.0-3.4; the mass concentration of the sulfuric acid solution is 15-50%.

[0031] 2. After the silica gel is formed, continue to react for 20-40 minutes, and then raise the temperature to 90-100 o C, adjust the pH value to 2-9, and age f...

Embodiment 1

[0037] Add 1000kg deionized water into the reaction kettle 5 with a stirrer, add 1kgPEG6000 and 4kgNaHCO at the same time 3， The control temperature is 50 o C, under the condition of constant stirring, use a peristaltic pump to inject 700kg of water glass solution with a concentration of 15% into the reactor 5, and simultaneously inject a concentration of 30% sulfuric acid to control the pH of the reaction solution to be about 8, and the feeding time is about 40min . After forming a gel, continue to react for 20 minutes, then adjust the pH value of the reaction slurry to 4, and heat up to 90 o C aging for 2 hours, after aging, continue to add 10% water glass solution until the pH value of the reaction slurry is 7. Finally, filter for solid-liquid separation, and wash the filter cake with deionized water until the conductivity of the filtrate is less than 0.4 μs / cm, dry and pulverize to obtain the finished product.

Embodiment 2

[0039] Add 900kg of deionized water into the reaction kettle 5 with a stirrer, add 1kgPEG6000 and 4kgNaHCO at the same time 3， The control temperature is 50 o C, under the condition of constant stirring, use a peristaltic pump to inject 800kg of water glass solution with a concentration of 12% into the reactor 5, and simultaneously inject a concentration of 25% sulfuric acid to control the pH of the reaction solution to be about 9, and the feeding time is about 40min . After forming a gel, continue to react for 20 minutes, then adjust the pH value of the reaction slurry to 5, and heat up to 90 o C aging for 3 hours, after aging, continue to add 12% water glass solution until the pH value of the reaction slurry is 6.5. Finally, filter for solid-liquid separation, and wash the filter cake with deionized water until the conductivity of the filtrate is less than 0.4 μs / cm, dry and pulverize to obtain the finished product.

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Abstract

The invention discloses porous silica gel air purifying particles and a preparation method thereof. The porous silica gel air purifying particles have the specific surface areas of 250-500m<2> / g, the pore volumes of 1.2-2.0mL / g, the average pore size of 5-50nm and the average particle size of 10-100mu m, have the characteristics of being large in specific surface areas, developed in pores, high in adsorption capacity and the like, can be used for absorbing gases such as formaldehyde, ammonia, total volatile organic compound (TVOC) and the like, and can be used for purifying the air and removing harmful gas. The surface of silica gel has free hydroxide radical, so that the porous silica gel air purifying particles are very high in adsorption capacity for polar materials such as formaldehyde, and the removal rate of formaldehyde reaches up to more than 85%. Furthermore, the silica gel silicon dioxide is high in purity, non-toxic and harmless, and does not contain any heavy metal, thus being an environment-friendly air purification product. The preparation method is mature in technology and easy in realization of industrial production.

Description

technical field [0001] The invention belongs to the technical field of environmental protection materials, and in particular relates to a porous silica gel air purification particle and a preparation method thereof. Background technique [0002] Silica gel is a kind of highly active adsorption material, which belongs to the amorphous substance, and its main component is silicon dioxide, the chemical formula is SiO 2 ·nH 2 O. Silica has the characteristics of large specific surface area, high porosity, and high purity. It is widely used in coatings, papermaking, petrochemicals, daily chemicals, plastics, pesticides, and many other fields. It is one of the most popular chemical products. Silica gel as an adsorbent, due to its high adsorption activity, can selectively adsorb harmful gases such as formaldehyde and ammonia, or absorb moisture in the air as a desiccant, and can also be used for adsorption and separation of substances, as a catalyst carrier wait. At present, th...

Claims

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Application Information

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IPC IPC(8): B01J20/10B01J20/28B01J20/30B01D53/02
CPCB01D53/02B01D2253/106B01D2253/304B01D2253/306B01D2253/308B01D2253/311B01J20/103B01J20/28016B01J20/28054B01J20/28061B01J20/28076B01J20/28083
Inventor 庄艺伟刘主良刘群鹏柯江洋刘志辉刘群鸿
Owner 福建省宇诚环保科技有限公司
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