Method for preparing rice hull active carbon/silicon dioxide/titanium dioxide composite material

A silicon dioxide and titanium dioxide technology, applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve problems such as low bonding strength, easy to fall off, poor reusability, etc., to solve environmental problems, Prevents easy falling off and improves stability

Active Publication Date: 2011-08-10
溧阳常大技术转移中心有限公司
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

At present, the most commonly used method for preparing activated carbon-supported nano-titanium dioxide is the sol-gel method, but the disadvantages of this method are: the bonding strength between nano-titanium dioxide and activated carbon carrier is low, nano-titanium dioxide is easy to fall off on the surface of the carrier, and the recycling value is not good. high
Chinese patent CN 101053845A discloses a method for preparing activated carbon-titanium dioxide composite photocatalyst by sol-gel method, which is made by stirring and mixing butyl titanate and absolute ethanol, and adding water, acetic acid, and absolute ethanol dropwise under strong stirring Catalyst to obtain titanium dioxide sol, and then add activated carbon in the sol process, after fully stirring, heat treatment to obtain activated carbon-titanium dioxide composite photocatalyst, the main disadvantages of this method are: ① The bonding strength between titanium dioxide and the carrier is not high after the composite photocatalyst is loaded , titanium dioxide is easy to fall off on the surface of the carrier, so the catalytic performance of the composite material will decrease after repeated use, and the reusability is poor; ② a large amount of organic solvents are used in the preparation process, which increases the production cost and is not conducive to environmental protection

Method used

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  • Method for preparing rice hull active carbon/silicon dioxide/titanium dioxide composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] First wash 1 kg of rice husk with clean water, dry, crush, pass through a 250-mesh sieve, add 10 kg of hydrochloric acid solution with a concentration of 3% by mass, stir at 85°C for 7 hours, wash with water until neutral, and obtain pickling Rice husk powder. Add 16.7 liters of 3 mol / L NaOH solution to the pickled rice husk powder, under constant stirring, maintain the alkali boiling temperature at 95°C, and keep the alkali boiling for 8 hours to obtain a mixed slurry composed of rice husk and sodium silicate. Then, under constant stirring, add 3.5mol / L TiCl to the mixed slurry composed of the obtained rice husk and sodium silicate. 4 solution, the reaction temperature is maintained at 90°C, and then the pH value of the reaction system is adjusted. When the pH value of the reaction system is adjusted to 5.5, TiCl 4 After the solution is added, continue to stir, heat-preserve and mature for 3 hours, filter, wash repeatedly with deionized water until the conductivity of...

Embodiment 2

[0015] First wash 1 kg of rice husk with clean water, dry, crush, pass through a 100-mesh sieve, add 1 kg of hydrochloric acid solution with a concentration of 10% by mass, stir at 40°C for 1 hour, wash with water until neutral, and obtain pickling Rice husk powder. Add 25 liters of 0.5 mol / L NaOH solution to the pickling rice husk powder, under constant stirring, maintain the alkali boiling temperature at 50°C, and keep the alkali boiling for 2 hours to obtain a mixed slurry composed of rice husk and sodium silicate. Then, under constant stirring, add 0.5 mol / L of TiCl to the mixed slurry composed of the obtained rice husk and sodium silicate 4 solution, the reaction temperature was kept at 45°C, and then the pH value of the reaction system was adjusted. When the pH of the reaction system was adjusted to 7.5, TiCl 4 After the solution is added, continue to stir, heat-preserve and mature for 0.5 hours, filter, wash repeatedly with deionized water until the conductivity of the...

Embodiment 3

[0017] First wash 1 kg of rice husk with clean water, dry, crush, pass through a 200-mesh sieve, add 5 kg of hydrochloric acid solution with a concentration of 5% by mass, stir at 70°C for 5 hours, wash with water until neutral, and obtain pickling Rice husk powder. Add 12.5 liters of 2 mol / L NaOH solution to the pickled rice husk powder, under constant stirring, maintain the alkali boiling temperature at 80°C, and keep the alkali boiling for 6 hours to obtain a mixed slurry composed of rice husk and sodium silicate. Then, under constant stirring, add 2.5mol / L of TiCl to the mixed slurry composed of the obtained rice husk and sodium silicate 4 solution, the reaction temperature is maintained at 75°C, and then the pH value of the reaction system is adjusted. When the pH of the reaction system is adjusted to 7, TiCl 4 After the solution is added, continue to stir, heat-preserve and mature for 2 hours, filter, wash repeatedly with deionized water until the conductivity of the fi...

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Abstract

The invention discloses a method for preparing a rice hull active carbon/silicon dioxide/titanium dioxide composite material in the technical field of preparation of nano titanium dioxide photocatalysts. The method comprises the following steps of: carrying out acid cleaning on rice hull powder; adding an NaOH solution into the rice hull powder which is subjected to acid cleaning and carrying out alkali cooking to obtain mixed size consisting of rice hulls and sodium silicate; preparing a rice hull/silicon dioxide/titanium dioxide precursor; and finally carrying out carbonization and activating treatment to prepare the rice hull active carbon/silicon dioxide/titanium dioxide composite material. The rice hulls and nano titanium dioxide are combined in a chemical bond mode by silicon dioxide. The rice hull active carbon/silicon dioxide/titanium dioxide composite material not only has excellent adsorption performance of rice hull active carbon, but also has excellent photocatalysis performance of the nano titanium dioxide. The problem that the nano titanium dioxide is easy to fall off on the surface of a vector is effectively avoided. The stability of the composite material is greatly improved. The method has the advantages of simple preparation process, low price of raw materials, low cost and low pollution.

Description

technical field [0001] The invention belongs to the technical field of preparation of nano-titanium dioxide photocatalyst, and in particular relates to a preparation method of rice husk activated carbon / silicon dioxide / titanium dioxide photocatalytic composite material. Background technique [0002] Nano-titanium dioxide is a typical photocatalyst, but in the traditional preparation method and application process, there are disadvantages such as low photocatalytic efficiency and difficult recovery, which limit its industrial application. In recent years, in order to improve the photocatalytic effect and recycling rate of nano-titanium dioxide, people have used various supports to prepare immobilized titanium dioxide photocatalysts. Among them, activated carbon has been widely used as a catalyst support. Activated carbon as a support has the following advantages: low price, acid resistance Alkali, stable in nature, has developed pore structure, huge specific surface area and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/18B01J37/03
Inventor 姚超秦泽勇孔泳罗士平魏科年王茂华马江权
Owner 溧阳常大技术转移中心有限公司
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