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Preparation method of nano-fiber supported nano-titania mesoporous material

A nano-titanium dioxide and nano-fiber technology, which is applied in chemical instruments and methods, chemical/physical processes, physical/chemical process catalysts, etc., can solve the problems of storage, degradation and removal of pollutants or harmful substances, and achieve good loading effect and low cost. Inexpensive, highly controllable results

Inactive Publication Date: 2014-12-10
CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these adsorptions can only temporarily store and transfer pollutants or harmful substances, but fail to fundamentally degrade and remove them, making it difficult to achieve the goal of treating both symptoms and root causes

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Step 1: Measure 10 mL of precursor n-butyl titanate at room temperature, slowly drop it into 40 mL of absolute ethanol at a speed of 3 mL / min under high-speed stirring, and continue stirring for 2 hours.

[0024] Step 2: Slowly add the uniformly stirred mixed solution to 300g of cellulose nanofibril solution with a solid content of 0.4%, add the catalyst dilute hydrochloric acid to adjust the pH value of the system to 3, stir at high speed for 1 hour, and gel reaction under the condition of ultrasonic dispersion 24h.

[0025] Step 3: Freeze-drying process. The above solution that has fully gelled and reacted is rapidly frozen and solidified at a low temperature of -100°C, and then freeze-dried at a moderate speed under a vacuum condition of 0.002MPa in a reaction chamber at -60°C.

[0026] Step 4: Post-aging and drying. The freeze-dried composite airgel is aged at room temperature for 1 week, and then vacuum-dried to absolute dryness under heating at 100-105°C to obta...

Embodiment 2

[0028] Step 1: Measure 10 mL of precursor n-butyl titanate at room temperature, slowly drop it into 50 mL of absolute ethanol at a speed of 4 mL / min under high-speed stirring, and continue stirring for 2 hours.

[0029] Step 2: Slowly add the uniformly stirred mixed solution to 200g of cellulose nanofibril solution with a solid content of 0.5%, add the catalyst dilute hydrochloric acid to adjust the pH value of the system to 3, stir at high speed for 1 hour, and gel reaction under the condition of ultrasonic dispersion 24h.

[0030] Step 3: Freeze-drying process. The above solution that has fully gelled and reacted is rapidly frozen and solidified at a low temperature of -80°C, and then freeze-dried at a moderate speed under a vacuum condition of 0.001MPa in a reaction chamber at -50°C.

[0031] Step 4: Post-aging and drying. The freeze-dried composite airgel is aged at room temperature for 1 week, and then vacuum-dried to absolute dryness under heating at 100-105°C to obtai...

Embodiment 3

[0033] Step 1: Measure 10 mL of precursor n-butyl titanate at room temperature, slowly drop it into 50 mL of absolute ethanol at a speed of 3 mL / min under high-speed stirring, and continue stirring for 3 hours.

[0034] Step 2: Slowly add the uniformly stirred mixed solution to 400g of cellulose nanofibril solution with a solid content of 0.4%, add the catalyst dilute hydrochloric acid to adjust the pH value of the system to 2, stir at high speed for 2 hours, and gel reaction under ultrasonic dispersion conditions 24h.

[0035] Step 3: Freeze-drying process. The above solution that has fully gelled and reacted is rapidly frozen and solidified at a low temperature of -100°C, and then freeze-dried at a moderate speed under a vacuum condition of 0.002MPa in a reaction chamber at -70°C.

[0036] Step 4: Post-aging and drying. The freeze-dried composite airgel is aged at room temperature for 1 week, and then vacuum-dried to absolute dryness under heating at 100-105°C to obtain th...

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Abstract

The invention relates to a preparation method of a nano-fiber supported nano-titania mesoporous material. The preparation method adopts biomass cellulose nano-filaments having a large specific surface area and a high length-diameter ratio as a carrier, and allows nano-titania to be grafted to the surfaces of nano-fibers through a sol-gel reaction by means of a hydrogen bond. The nano-fibers interlace with each other in an aqueous solution to form a netted structure, so an effective reaction area can be provided, the rapid nucleation growth of gel titania particles can be prevented, and the full reaction of the gel titania particles with hydroxy groups on the surfaces of the fibers is promoted. The mesopore diameter can be adjusted through controlling the content of water in a mixed system, so the mesoporous composite aerogel material having the advantages of strong mechanical performances, good load effect and large specific surface area is obtained. The method has the advantages of simple operation, strong controllability, and wide raw material source, and is an efficient, environmentally-friendly and sustainable processing means.

Description

technical field [0001] The invention relates to the preparation of nano mesoporous materials, in particular to a preparation method of nanofiber loaded nano titanium dioxide mesoporous materials which can be used for air purification in the environment. Background technique [0002] With the continuous advancement of industrialization, air pollution has posed a major threat to human living environment and physical and mental health, and it is urgent to control air pollution. At present, the main methods of air purification include physical adsorption, chemical oxidation, biodegradation, and photocatalytic oxidation. Among them, activated carbon, molecular sieve and other materials can efficiently and selectively adsorb various organic and inorganic air pollutants. However, these adsorptions can only temporarily store and transfer pollutants or harmful substances, but fail to fundamentally degrade and remove them, making it difficult to achieve the goal of treating both symp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/28C08L1/02B01J31/38
Inventor 卿彦吴义强
Owner CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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