Method for preparing nano hierarchical pore carbon material based on rice hull ash

Abstract

The invention provides a method for preparing a nano hierarchical pore carbon material based on rice hull ash, and relates to the technical field of nano carbon. The method comprises the following steps: 1, preparing raw materials: grinding and crushing rice hull ash, adding a proper amount of caustic soda, and directly generating a rice hull ash and sodium silicate mixture in a high-pressure steamer, and 2, pretreating the raw materials, and reacting the rice hull ash and sodium silicate mixture with tellurium tetrafluoride in a reaction kettle. Sodium silicate is produced from silicon dioxide contained in rice hull ash and caustic soda, and then tellurium tetrafluoride is mixed to produce silicon tetrafluoride, so that the temperature can be increased for stable evaporation, the silicondioxide can be easily separated, and the problem that the unit surface area of the rice hull ash is reduced due to the silicon dioxide is avoided; and secondly, hydrofluoric acid and other types of strong base and strong acid are not used, so that the safety of the rice hull ash can be guaranteed, damage to production workers caused by strong acid and strong base is avoided, the production efficiency is synchronously improved, and the production steps are simplified.

Description

technical field [0001] The invention relates to the technical field of nano-carbon, in particular to a method for preparing nano-scaled porous carbon material based on rice husk ash. Background technique [0002] Nano-carbon materials refer to carbon materials with at least one dimension of the dispersed phase smaller than 100 nanometers. The dispersed phase can be composed of either carbon atoms or heteroatoms (non-carbon atoms), or even nanopores. Carbon nanomaterials mainly include three types: carbon nanotubes, carbon nanofibers, and carbon nanospheres. [0003] Most of the nano-carbon materials currently in use use clean carbon materials to remove impurities and purify them. In the actual production process, because rice husks contain a large amount of lignin and cellulose, the raw materials for preparing nano-carbons perform better, but After burning, about 1.3% silicide will be mixed in the rice husk ash. If it is not treated, the silicide will cause the unit surfac...

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Problems solved by technology

[0003] Most of the nano-carbon materials currently in use use clean carbon materials to remove impurities and purify them. In the actual production process, because rice husks contain a large amount of lignin and cellulose, the raw materials for preparing nano-carbons perform better, but After burning, about 1.3% silicide will be mixed in the rice husk ash. If it is not treated, the silicide will cause the unit surface area of ​​nano-carbon to decrease in the subsequent preparation process, but the existing treatment methods Most of them are removed by hydrofluoric acid and various types of strong acid and strong alkali. In the actual removal process, the removal efficiency of the actual silicon compound is not good, and new impurities are often produced and mixed in the rice husk ash, followed by strong acid and strong alkali , leading to cumbersome steps in the production process, which is not conducive to the user's improvement of production efficiency, and once the production of strong acid and strong alkali is leaked, it is very easy to produce serious safety production accidents, resulting in major accidents of personal injury

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