Starch carbide/sepiolite composite material and preparation method thereof

A composite material and sepiolite technology, which is applied in the field of starch carbide/sepiolite composite material and its preparation, can solve the problems of high energy consumption of thermal modification, environmental pollution, equipment corrosion, etc., and achieve controllable reaction and adsorption effect Good, fast response time effect

Pending Publication Date: 2020-01-10
GUANGXI UNIV FOR NATITIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are more or less problems in these modification methods: for example, acid modification often causes serious corrosion to equipment, thermal modification consumes a lot of energy, and organic modification is easy to cause pollution to the environment, etc.

Method used

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  • Starch carbide/sepiolite composite material and preparation method thereof
  • Starch carbide/sepiolite composite material and preparation method thereof
  • Starch carbide/sepiolite composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A kind of preparation method of starch carbide / sepiolite composite material, comprises the following steps:

[0035] (1) Add 0.5 g of ferrous ammonium sulfate hexahydrate into water, stir until dissolved, and obtain a catalytic solution.

[0036] (2) Disperse 8g of starch in water to obtain a starch solution, then add the starch solution and 5g of sepiolite to the catalytic solution, stir and disperse evenly, first stir at 600rpm for 1h, and then ultrasonically shake at 45kHz for 1h , to obtain a mixed suspension.

[0037] (3) The mixed suspension was placed in a stainless steel reactor for hydrothermal carbonization at a reaction temperature of 180° C. and a reaction time of 12 hours to obtain a brown solid substance.

[0038] (4) Alternately washing the brown solid matter with water and absolute ethanol until the filtrate is colorless, and then vacuum freeze-drying to obtain a starch carbide / sepiolite composite material.

Embodiment 2

[0040] A kind of preparation method of starch carbide / sepiolite composite material, comprises the following steps:

[0041] (1) Add 0.7 g of ferrous ammonium sulfate hexahydrate into water, stir until dissolved, and obtain a catalytic solution.

[0042] (2) Disperse 10g of starch in water to obtain a starch solution, then add the starch solution and 9g of sepiolite to the catalytic solution, stir and disperse evenly, first stir at 550rpm for 2.5h, and then ultrasonically oscillate at 47kHz After 1.3h, a mixed suspension was obtained.

[0043] (3) The mixed suspension was placed in a stainless steel reactor for hydrothermal carbonization at a reaction temperature of 170° C. and a reaction time of 16 hours to obtain a brown solid substance.

[0044] (4) Alternately washing the brown solid matter with water and absolute ethanol until the filtrate is colorless, and then vacuum freeze-drying to obtain a starch carbide / sepiolite composite material.

Embodiment 3

[0046] A kind of preparation method of starch carbide / sepiolite composite material, comprises the following steps:

[0047] (1) Add 0.3 g of ferrous ammonium sulfate hexahydrate into water, stir until dissolved, and obtain a catalytic solution.

[0048] (2) Disperse 5g of starch in water to obtain a starch solution, then add the starch solution and 1g of sepiolite to the catalytic solution, stir and disperse evenly, first stir at 500rpm for 1h, and then ultrasonically shake at 50kHz for 1h , to obtain a mixed suspension.

[0049] (3) The mixed suspension was placed in a stainless steel reactor for hydrothermal carbonization at a reaction temperature of 150° C. and a reaction time of 20 h to obtain a brown solid substance.

[0050](4) Alternately washing the brown solid matter with water and absolute ethanol until the filtrate is colorless, and then vacuum freeze-drying to obtain a starch carbide / sepiolite composite material.

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Abstract

The invention discloses a starch carbide/sepiolite composite material and a preparation method thereof. The preparation method comprises the following steps: dissolving a catalyst in water, adding starch and sepiolite, uniformly mixing, carrying out hydrothermal carbonization reaction, carbonizing the starch to form carbon microspheres, loading the carbon microspheres on the surface of the sepiolite, and carrying out vacuum freeze drying to obtain the starch carbide/sepiolite composite material. The composite material disclosed by the invention is large in specific surface area and good in adsorption effect on organic pollutants, and the adsorption capacity on methylene blue reaches 39.36 mg/g or above and is improved by 12.04% or above compared with the adsorption effect of a sepiolite raw material; the preparation method has the advantages of simplicity, mild reaction conditions, low raw material cost, facilitation of realization of the high added value of sepiolite, and good application prospect.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and in particular relates to a starch carbide / sepiolite composite material and a preparation method thereof. Background technique [0002] Sepiolite is a magnesium-rich silicate clay mineral, belonging to the orthorhombic or monoclinic system, and the standard crystal chemical formula is Mg 8 (H 2 O) 4 [Si 6 o 16 ] 2 (OH) 4 ·8H 2 O, in its structural unit, silicon-oxygen tetrahedrons and magnesium-oxygen octahedrons alternate with each other, with layered and chain-like transitional features. It is precisely because of this unique structure that sepiolite has a high specific surface area, large porosity, good adsorption, rheology and catalytic properties, and has a broad application prospect. However, the grade of natural sepiolite is low, the content of impurities is high, and the surface acidity is weak, the channels are small, and the stability is not good. These weaknesses...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30C02F1/28B01J23/745C02F101/36C02F101/38
CPCB01J20/10B01J20/20B01J20/28059B01J20/28061B01J20/28083B01J23/745C02F1/281C02F1/283C02F2101/36C02F2101/38C02F2101/40
Inventor 蓝丽红郑锡瀚蓝平谢涛马忻狄
Owner GUANGXI UNIV FOR NATITIES
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