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

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 ...

AI Technical Summary

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 oxygen-containing groups in the biomass decreases, the adsorption active sites decrease, the adsorption capacity becomes smaller, and the selectivity is weakened, which is not conducive to being used as a nuclide ion adsorbent.

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