Method for preparing carbon microsphere adsorbent under catalysis of metal salt with low-temperature hydrothermal method

A technology of metal salts and carbon microspheres, which is applied in the field of biomass resource utilization and biomass adsorption materials, can solve the problems of unfavorable expansion and utilization of carbon microspheres, complex addition of catalyst components, unfavorable industrial applications, etc., to achieve chemical modification, Good economic benefits and promotion and application prospects, the effect of uniform size

Active Publication Date: 2016-05-18
SOUTHWEAT UNIV OF SCI & TECH
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Problems solved by technology

For example, the patent document CN104649246A discloses "a low-temperature hydrothermal preparation method of biomass carbon micro / nanospheres, which adopts a one-pot low-temperature hydrothermal carbonization method of biomass carbonization by base catalysis or Lewis acid / protonic acid catalysis, This technical solution has complicated process and complex addition of catalyst components, which is not conducive to the further expansion and utilization of carbon microspheres.
[0003] At present, the biomass raw material for preparing hydrothermal carbon microspheres at relatively low temperature is mainly fructose solution, but the source is limited, which is not conducive to industrial application; glucose solution is used as the carbon source, the hydrothermal temperature is 180-220°C, and the reaction time is more than 24 hours ;Using other biomass raw materials as carbon sources, hydrothermal temperature greater than 220°C, and reaction time greater than 24 hours

Method used

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  • Method for preparing carbon microsphere adsorbent under catalysis of metal salt with low-temperature hydrothermal method
  • Method for preparing carbon microsphere adsorbent under catalysis of metal salt with low-temperature hydrothermal method
  • Method for preparing carbon microsphere adsorbent under catalysis of metal salt with low-temperature hydrothermal method

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Embodiment 1

[0036] Step 1, get glucose and dissolve in water, prepare the glucose solution that concentration is 10wt%, take AlCl 3 Dissolve in water to prepare AlCl with a concentration of 2wt% 3 solution; then glucose solution and AlCl 3 The solutions were mixed together in a mass ratio of 3:1 and stirred for 10 minutes to obtain a reaction solution;

[0037] Step 2, transfer the reaction solution to a stainless steel reactor, wherein the reaction solution accounts for 80% of the volume of the reactor, then raise the temperature to 120°C at a heating rate of 1°C / min, and react at a constant temperature for 10 hours, then naturally cool, separate, and 60 ℃ vacuum drying to obtain hydrothermal carbon microspheres;

[0038] Step 3, heating the hydrothermal carbon microspheres to 300°C for 2 hours at a heating rate of 1°C / min in an air atmosphere to obtain the carbon microsphere adsorbent.

Embodiment 2

[0040] Step 1, get glucose and dissolve in water, prepare the glucose solution that concentration is 10wt%, take SnCl 4 Dissolve in water to prepare SnCl with a concentration of 2wt% 4 solution; then glucose solution and SnCl 4 The solutions were mixed together in a mass ratio of 3:1 and stirred for 10 minutes to obtain a reaction solution;

[0041] Step 2, transfer the reaction solution to a stainless steel reactor, wherein the reaction solution accounts for 80% of the volume of the reactor, then raise the temperature to 120°C at a heating rate of 1°C / min, and react at a constant temperature for 10 hours, then naturally cool, separate, and 60 ℃ vacuum drying to obtain hydrothermal carbon microspheres;

[0042] Step 3, heating the hydrothermal carbon microspheres to 300°C for 2 hours at a heating rate of 1°C / min in an air atmosphere to obtain the carbon microsphere adsorbent.

Embodiment 3

[0044] Step 1, get glucose and dissolve in water, prepare the glucose solution that concentration is 10wt%, take CrCl 3 Dissolve in water to prepare CrCl with a concentration of 2wt% 3 solution; then glucose solution and CrCl 3 The solutions were mixed together in a mass ratio of 3:1 and stirred for 10 minutes to obtain a reaction solution;

[0045] Step 2, transfer the reaction solution to a stainless steel reactor, wherein the reaction solution accounts for 80% of the volume of the reactor, then raise the temperature to 120°C at a heating rate of 1°C / min, and react at a constant temperature for 10 hours, then naturally cool, separate, and 60 ℃ vacuum drying to obtain hydrothermal carbon microspheres;

[0046] Step 3, heating the hydrothermal carbon microspheres to 300°C for 2 hours at a heating rate of 1°C / min in an air atmosphere to obtain the carbon microsphere adsorbent.

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Abstract

The invention discloses a method for preparing a carbon microsphere adsorbent under catalysis of metal salt with a low-temperature hydrothermal method. The method comprises steps as follows: (1) a biomass solution with the concentration being 2wt%-20wt% and a metal salt solution with the concentration being 0.5wt%-2wt% are prepared, then mixed in the mass ratio being (2-5):1 and stirred for 5-10 min, and a reaction solution is obtained; (2) the reaction solution is transferred to a stainless steel reaction kettle, the volume of the reaction solution accounts for 60%-80% of that of the reaction kettle, the reaction solution is heated to 100-160 DEG C at a certain heating speed, reacts at the constant temperature for 8-20 hours and is naturally cooled, separated and dried in vacuum, and hydrothermal carbon microspheres are obtained; (3) the hydrothermal carbon microspheres are calcined and carbonized at the air atmosphere, and the carbon microsphere adsorbent is obtained. The preparation process of the adsorbent is simple, energy consumption is low, the reaction time is shortened to be within 24 hours, and the adsorbent has high adsorption performance for part of positive ions, particularly, uranyl ions, has excellent radioresistance, thermal stability and acid stability and can be widely used for treatment of radioactive wastewater.

Description

technical field [0001] The invention belongs to the technical field of biomass resource utilization and biomass adsorption materials, and in particular relates to a method for preparing carbon microsphere adsorbents by a metal salt catalyzed low-temperature hydrothermal method. Background technique [0002] Energy conservation, environmental protection, and nuclear energy development and utilization have long been highly valued by China and even the world. In addition to chemical toxicity, the radioactive wastewater produced by the nuclear industry has a radioactive effect on the ecological environment, which poses a serious threat to the survival and development of plants and humans. Therefore, it is of practical significance to develop new materials and technologies to treat uranyl ions in wastewater. Compared with chemical precipitation, ion exchange, membrane and other methods, the use of adsorption to remove uranyl ions in wastewater has the advantages of low cost and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/28B01J20/30C02F1/28
CPCB01J20/20B01J20/28021C02F1/281
Inventor 林晓艳蔡华明罗学刚
Owner SOUTHWEAT UNIV OF SCI & TECH
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