Preparation method of carboxylation hydrothermal biomass charcoal for remedying uranium-containing wastewater

A biomass carbon, carboxylation technology, applied in chemical instruments and methods, water/sewage treatment, adsorbed water/sewage treatment, etc. Reduce the number of problems, to achieve the effect of large adsorption capacity, high carboxyl content and short production cycle

Inactive Publication Date: 2015-04-08
EAST CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The main defects of this kind of biomass adsorbents are: poor radiation resistance, long repair period, high cost, low adsorption capacity and poor selectivity, etc.
However, during the pyrolysis process, the number of oxyg

Method used

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  • Preparation method of carboxylation hydrothermal biomass charcoal for remedying uranium-containing wastewater
  • Preparation method of carboxylation hydrothermal biomass charcoal for remedying uranium-containing wastewater
  • Preparation method of carboxylation hydrothermal biomass charcoal for remedying uranium-containing wastewater

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Dry the pine needles at 80°C and crush them to 40 meshes. Weigh 10g of pine needle powder, 0.2g of citric acid and 60ml of distilled water into a 100ml hydrothermal reaction kettle, react at 180°C for 16h, and then filter to obtain hydrothermal biochar. Then, 10g of hydrothermal biochar was added to 100ml of 2mol / L HNO 3 In the solution, react at 80°C for 1 hour, then filter, wash and dry to obtain carboxylated hydrothermal biomass charcoal HTC-COOH-1.

[0021] figure 1 is the infrared spectrum of hydrothermal biochar and carboxylated hydrothermal biochar, in which, 1708 cm -1 It is the stretching vibration peak of C=O in the carboxyl group, 3400cm -1 is the stretching vibration peak of -OH. The results showed that the carboxyl content on the surface of hydrothermal biochar increased significantly after carboxylation.

[0022] figure 2 is the effect of initial concentration on the uranium adsorption capacity of hydrothermal biochar and carboxylated hydrothermal bi...

Embodiment 2

[0025] Dry the orange peel at 80°C and crush it to 20 meshes. Weigh 10g of orange peel powder, 0.1g of phosphoric acid and 60ml of distilled water into a 100ml hydrothermal reaction kettle, react at 200°C for 6 hours, and then filter to obtain hydrothermal biochar. Then, 10g of hydrothermal biochar was added to 100ml of 1.5mol / L KMnO 4 In the solution, react at 70°C for 2 hours, then filter, wash and dry to obtain carboxylated hydrothermal biomass charcoal HTC-COOH-2.

Embodiment 3

[0027] Dry the rice straw at 80°C and crush it to 20 meshes. Weigh 10g of straw powder, 0.3g of formic acid and 60ml of distilled water into a 100ml hydrothermal reactor, react at 180°C for 8 hours, and then filter to obtain hydrothermal biochar. Then, 10 g of hydrothermal biochar was added to 100 ml of 1.0 mol / L sodium persulfate sulfuric acid solution, reacted at 80 °C for 4 hours, filtered, washed and dried to obtain carboxylated hydrothermal biochar HTC-COOH-3.

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Abstract

The invention relates to a preparation method of carboxylation hydrothermal biomass charcoal for remedying uranium-containing wastewater. The preparation method comprises the following steps: feeding dried and crushed natural biomass A, a carbonization accelerant B and distilled water into a hydrothermal reaction kettle for hydrothermal reaction under constant temperature; filtering after a while of hydrothermal reaction to obtain hydrothermal biomass charcoal C; feeding the hydrothermal biomass charcoal C, an oxidant D and distilled water into a reaction vessel; heating to react for a while; then filtering, washing and drying to obtain the carboxylation hydrothermal biomass charcoal. The carboxylation hydrothermal biomass charcoal prepared by the method has the advantages that the raw materials are rich in source, the cost is low, the preparation process is simple, the production cycle is short, few chemical agents are used, the product yield is high, the surface oxygen-containing groups are rich, the carboxyl group content is high, the uranium adsorption capacity is large, and the selectivity is high.

Description

technical field [0001] The invention relates to a preparation method of carboxylated hydrothermal biomass charcoal used for repairing uranium-containing wastewater, and belongs to the technical field of development and utilization of biomass resources. Background technique [0002] Uranium-related processes such as uranium mining, component processing, and nuclear facilities will produce a large amount of uranium-containing wastewater during production and operation. If uranium accumulates in the environment in large quantities, it will cause environmental damage as a heavy metal with both chemical and radiotoxicity. Bottom radiation causes genetic mutation of species, irreversible damage to plants, farmland and soil, and poses a potential threat to human survival and development. Therefore, it has become an environmental issue of global concern to adopt an efficient and quick method to separate and enrich the uranium-containing wastewater discharged during the nuclear fuel ...

Claims

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Application Information

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IPC IPC(8): B01J20/22B01J20/30C02F1/28C02F1/62
CPCB01J20/22G21F9/12
Inventor 张志宾刘云海曹小红花榕徐维
Owner EAST CHINA UNIV OF TECH
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