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Oil-absorbing white radish-based carbon aerogel and preparation method thereof

A technology of carbon airgel and white radish, which is applied in the direction of separation methods, chemical instruments and methods, and other chemical processes, can solve the problems of harsh preparation conditions, complicated methods, and high equipment requirements for bacterial cellulose, and achieve high practical value and Application prospect, simplification of preparation process, and avoidance of high-temperature calcination

Inactive Publication Date: 2021-03-23
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The carbon aerogel has an oil absorption rate of 50-300 times, has excellent recyclability and selective adsorption, and can recover the adsorbed liquid by extrusion and centrifugation to realize the recycling of carbon aerogel, but the carbon aerogel The preparation conditions of bacterial cellulose in the method are harsh, the raw materials are expensive, and the large-scale cultivation of bacterial cellulose is time-consuming and laborious, which limits the large-scale application of this type of carbon aerogel
Chinese patent CN107159111A discloses a method of preparing carbon airgel by hydrothermally carbonizing pomelo peels, freeze-drying, and carbonizing at 800-1100°C. The biomass raw materials used in this method are cheap and widely sourced, and the preparation process is simple. It has a high adsorption rate, but the disadvantage is that it needs to be carbonized at high temperature, which requires high equipment and high energy consumption, and the recycling of carbon airgel can only be realized by distillation and combustion.
The combustion method is simple and fast, but the disadvantage is that the adsorbed oil cannot be recovered, and the gas produced after some oil combustion will pollute the environment
Distillation can recover the adsorbed oil, but the method is complex, energy-intensive and time-consuming
The method that can effectively recover the oil absorbed by the airgel and make the airgel recyclable is the extrusion method, but most of the biomass carbon aerogels currently reported generally have poor mechanical properties, are not compressible, and cannot pass through Oil is recovered by extrusion, and the high-temperature carbonization step of airgel consumes a lot of energy. These factors limit the large-scale application of biomass oil-absorbing carbon aerogels.

Method used

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  • Oil-absorbing white radish-based carbon aerogel and preparation method thereof
  • Oil-absorbing white radish-based carbon aerogel and preparation method thereof
  • Oil-absorbing white radish-based carbon aerogel and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0039] After peeling the white radish, cut it into regular white radish rectangular cubes, place it in the polytetrafluoroethylene lining in the stainless steel autoclave, and the solvent is deionized water. The reaction kettle was placed in an oven at 180° C., hydrothermally reacted for 10 h, and then cooled to room temperature naturally. The product was washed twice with deionized water and ethanol at 70°C, and then soaked in deionized water for 24 hours to remove soluble impurities to obtain a black carbonaceous hydrogel. The carbonaceous hydrogel was pre-frozen in the refrigerator for 12 hours, and then vacuum-dried in a vacuum freeze dryer at -65°C for 48 hours to finally prepare the white radish-based carbon aerogel.

[0040] The carbon aerogel was modified by simple chemical vapor deposition, and the carbon aerogel was placed in a closed container together with two beakers filled with deionized water and methyltrimethoxysilane respectively (deionized water and methyltri...

Embodiment 2

[0043] After peeling the white radish, cut it into regular cuboid radish pieces, place them in the polytetrafluoroethylene lining in the stainless steel autoclave, and the solvent is deionized water. The reaction kettle was placed in an oven at 180°C, hydrothermally reacted for 10 h, and then cooled to room temperature naturally. The product was washed with 70°C deionized water and ethanol four times respectively, and then soaked in deionized water for 24 hours to remove soluble impurities to obtain a black carbonaceous hydrogel. The carbonaceous hydrogel was pre-frozen in the refrigerator for 12 hours, and then vacuum-dried in a vacuum freeze dryer at -65°C for 48 hours to finally prepare the white radish-based carbon aerogel.

[0044] The carbon airgel was modified by simple chemical vapor deposition, and the carbon airgel was placed in a closed container together with two beakers filled with ammonia water and methyltrimethoxysilane (ammonia water and methyltrimethoxysilane ...

Embodiment 3

[0047] After peeling the white radish, cut it into regular cuboid white radish pieces, place them in the polytetrafluoroethylene lining in the stainless steel autoclave, and the solvent is deionized water. The reaction kettle was placed in an oven at 180°C, hydrothermally reacted for 10 h, and then cooled to room temperature naturally. The product was washed with 70°C deionized water and ethanol four times respectively, and then soaked in deionized water for 24 hours to remove soluble impurities to obtain a black carbonaceous hydrogel. The carbonaceous hydrogel was pre-frozen in the refrigerator for 12 hours, and then the carbonaceous wet gel was placed in a vacuum freeze dryer at -65°C for 48 hours in vacuum to finally prepare the white radish-based carbon aerogel.

[0048] The carbonaceous aerogel was modified by simple chemical vapor deposition, and the carbon aerogel was placed in a closed container together with two beakers filled with deionized water and dimethyldiethoxy...

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Abstract

The invention discloses oil-absorbing white radish-based carbon aerogel and a preparation method thereof, belonging to the field of treatment of marine oil leakage pollution. According to the invention, white radish is used as a raw material and is subjected to the preparation processes of hydrothermal carbonization, vacuum freeze drying, chemical vapor deposition hydrophobic modification and thelike to prepare the oil-absorbing white radish-based carbon aerogel. The white radish adopted in the invention is a cheap, renewable and degradable biomass raw material, and the preparation method ofthe oil-absorbing white radish-based carbon aerogel has the advantages of simple process, low preparation cost, safety, environmental protection and the like. The prepared carbon aerogel can be applied to adsorption of various oil products (including engine oil, castor oil, pump oil, edible blend oil and simethicone) and organic solvents (including ethanol, chloroform and petroleum ether), an adsorption rate is 30.05 g / g to 64.96 g / g, and the carbon aerogel has high practical value and application prospects.

Description

technical field [0001] The invention belongs to the technical field of oil pollution treatment materials, and in particular relates to a preparation method of an environment-friendly oil-absorbing white radish-based carbonaceous airgel. Background technique [0002] Petroleum is an extremely important natural resource. Its exploitation and use have greatly improved people's quality of life and promoted the development and progress of human industry. However, in recent years, in the process of oil extraction and transportation, accidents of oil leakage caused by offshore platforms, drilling platforms, and oil tankers in severe weather have also occurred frequently. Offshore oil spill accidents will destroy the marine ecological environment and affect the survival and development of human beings. Therefore, how to deal with the problem of offshore oil spill has become a realistic and urgent problem. At present, the methods for dealing with marine oil spills mainly include ph...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/28B01J20/30B01D17/022
CPCB01D17/0202B01J20/20B01J20/28047B01J20/3071B01J20/3078B01J20/3085B01J2220/485
Inventor 李湘祁肖绍峰刘倩严卓锋
Owner FUZHOU UNIV
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