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.