Preparation method and application of biochar by enriching copper element in ciliate desert grass

Abstract

The invention provides a preparation method and application of biochar with ciliate desert-grass enriched with a copper element. The method comprises the steps that 1, screening and transplanting robust seedlings, irrigating the seedlings with a Cu<2+> metal solution once every 3-5 days to enrich copper for 1 month, harvesting the ciliate desert-grass to obtain the ciliate desert-grass rich in copper, wherein blank control is water irrigated by water; 2) digging up the copper-enriched ciliate desert-grass and blank control plants, washing away soil at the roots and cutting the roots of the plants into pieces, drying the pieces in a drying oven respectively, and storing the pieces for later use; 3) respectively taking the dried blank control ciliate desert-grass root system and the copper-enriched ciliate desert-grass root system in a crucible, exhausting air under a sealed condition, feeding nitrogen until the pressures inside and outside the crucible are balanced, and adjusting the nitrogen flow rate to 15-25 ml / min and sintering the materials at 500-900 DEG C to obtain biochar; 4) grinding the biochar, pouring the biochar into a 3-6 mol / L NaOH solution, stirring the liquid for 1-3 hours at 70-85 DEG C, filtering and water-washing the material, standing the material, removing floating dregs, and drying the material to obtain the biochar with ciliate desert-grass enriched witha copper element, which has a good catalytic degradation effect on methylene blue under the catalysis of visible light.

Description

technical field [0001] The invention provides a method for preparing biochar enriched with copper elements from centipede grass and its application field in photocatalytic degradation. Background technique [0002] The development of social industry is inseparable from the development and utilization of mineral resources. Mineral mining activities will cause great damage to the surrounding environment, such as vegetation destruction in mining areas, geological disasters, groundwater pollution, waste gas, waste residue, and waste liquid "three wastes" pollution, etc. The development and utilization of non-ferrous metal minerals will also produce heavy metal pollution, causing serious damage to the surrounding atmospheric environment, water environment, and soil environment. Heavy metals are difficult to degrade in the environment and are bioaccumulative. Heavy metals that exist in various chemical forms will accumulate and migrate after entering the ecosystem, enriching throu...

AI Technical Summary

Problems solved by technology

After phytoremediation of heavy metal pollution, a certain amount of heavy metals are enriched in the body, but the biomass level of plants is relatively low. After incineration, the metal content is limited, and the extraction and recovery requires high costs. At present, the common practice is to concentrate them as hazardous waste after incineration. landfill

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