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Supergravity gas-liquid precipitation method for preparing silica nanoparticles based on rice hull ash

A silicon dioxide and nanoparticle technology, applied in nanotechnology, nanotechnology, nanotechnology and other directions for materials and surface science, can solve the problems of low product quality, large product particle size, low activity, etc., and achieve the production cycle The effect of shortening, increasing conversion rates, and reducing costs

Inactive Publication Date: 2017-05-10
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the main acid precipitation method is sulfuric acid acidification method. The preparation of silica by acid precipitation method has simple production technology, process and equipment, wide source of raw materials, and low production cost, but the product has large particle size, low activity, difficult to control particles, and high affinity. Poor, relatively low product quality

Method used

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  • Supergravity gas-liquid precipitation method for preparing silica nanoparticles based on rice hull ash
  • Supergravity gas-liquid precipitation method for preparing silica nanoparticles based on rice hull ash
  • Supergravity gas-liquid precipitation method for preparing silica nanoparticles based on rice hull ash

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Weigh 100g of crushed rice husk ash and place it in a 1L three-necked flask, and pour 1L of 1mol / L hydrochloric acid solution into 1L of 1mol / L hydrochloric acid solution according to the amount of acid solution added based on the mass of the rice husk ash, and put condensing reflux on the three-necked flask device, placed in boiling water for 2h. Immediately after the reaction was completed, filter and wash with deionized water until the washing was neutral. Take the filter residue and dry it at 120°C to obtain the treated rice husk ash for future use.

[0032] (2) Weigh 30g of treated rice husk ash and place it in a 500mL three-necked flask, and pour 150ml of 2.5mol / L Na 2 CO 3 solution, install a condensing reflux device on the three-neck flask, and place it in boiling water for 4 hours. Immediately after the reaction, filter, wash with 150mL 85°C deionized water, combine the filtrates to form a water glass solution, keep it warm, and reserve it for the acidif...

Embodiment 2

[0037] (1) Weigh 100g of crushed rice husk ash and place it in a 1L three-necked flask, and pour 1L of 1mol / L hydrochloric acid solution into 1L of 1mol / L hydrochloric acid solution according to the amount of acid solution added based on the mass of the rice husk ash, and put condensing reflux on the three-necked flask device, placed in boiling water for 2h. Immediately after the reaction was completed, filter and wash with deionized water until the washing was neutral. Take the filter residue and dry it at 120°C to obtain the treated rice husk ash for future use.

[0038] (2) Weigh 30g of treated rice husk ash and place it in a 500mL three-necked flask, and pour 10mL / g into 300mL 1.5mol / L Na 2 CO 3 solution, install a condensing reflux device on a three-necked flask, and place it in boiling water for 3 hours. Immediately after the reaction, filter and wash with 300mL 95°C deionized water, combine the filtrate, keep it warm, and save it for the acidification precipitation m...

Embodiment 3

[0041] (1) Weigh 100g of pulverized rice husk ash and place it in a 1L three-necked flask, pour 500mL of 5mol / L hydrochloric acid solution into 500mL of 5mol / L hydrochloric acid solution according to the amount of acid solution added in terms of rice husk ash mass, and put condensing reflux on the three-necked flask device, placed in boiling water for 1h. Immediately after the reaction was completed, filter and wash with deionized water until the washing was neutral. Take the filter residue and dry it at 120°C to obtain the treated rice husk ash for future use.

[0042] (2) Weigh 30g of processed rice husk ash and place it in a 500mL three-necked flask, and pour 15mL / g into 450mL 0.1mol / L NaOH solution according to the amount of alkaline solution added in terms of the mass of the solid product, and put condensate on the three-necked flask Reflux device, placed in boiling water for 5h. Immediately after the reaction, filter and wash with 450mL 90°C deionized water, combine th...

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Abstract

The invention relates to a supergravity gas-liquid precipitation method for preparing silica nanoparticles based on rice hull ash. The supergravity gas-liquid precipitation method for preparing the silica nanoparticles based on the rice hull ash has the advantages that the rice hull ash is taken as a raw material, a supergravity container substitutes for an acidizing stirring reactor, and a surfactant is added into reaction, so that cost is reduced greatly, acidizing reaction time can be shortened, and both efficiency and product quality can be improved. Silica prepared by the method is high in purity, small in particle size and even in distribution, and can be widely applied to the fields such as catalysts and additives, thereby being promising in prospect.

Description

technical field [0001] The invention relates to a supergravity gas-liquid precipitation method for preparing silicon dioxide nanoparticles based on rice husk ash, which belongs to the technical field of chemical industry. Background technique [0002] my country is the country with the richest rice husk resources in the world, accounting for 37% of the world's total rice output, ranking first in the world. At present, the rice husk produced in our country is generally used to burn heat or generate electricity. The use of rice husk has been biased as energy in the past, but there will still be a large amount of rice husk ash after use. Rice husk ash is rich in silicon and carbon elements, and is usually discarded as agricultural waste, which not only pollutes the environment, but also causes a waste of resources. With people's new understanding of the environment and biomass resources, the utilization of rice husk ash has gradually been paid attention to. The known uses of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/193B82Y30/00B01J19/28
CPCC01B33/193B01J19/28C01P2002/01C01P2002/82C01P2004/03C01P2004/64
Inventor 张智亮郑建忠王广全计建炳
Owner ZHEJIANG UNIV OF TECH
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