▎ 摘　　要

NOVELTY - Regulating lawn compost substrate cadmium morphology and distribution by using carbon nano material comprises (i) taking test waste compost from Tianjin Xiaodian domestic waste composting plant, sieving, selecting plant Festuca arundinacea, taking graphene microchip, graphene oxide, carboxylated multi-walled carbon nanotubes and hydroxylated multi-walled carbon nanotubes, and (ii) planting tall fescue in PVC pipe, filling the bottom of each PVC pipe with sand, filling top layer with domestic waste compost and carbon nano-materials to form mixed substrate of compost and nano-materials. USE - The method is useful for regulating lawn compost substrate cadmium morphology and distribution by using carbon nano material for improving the bioavailability of heavy metals in substrates by using state transformation (all claimed). ADVANTAGE - The method improves the use of heavy metal in the substrate. DETAILED DESCRIPTION - Regulating lawn compost substrate cadmium morphology and distribution by using carbon nano material comprises (i) taking test waste compost from Tianjin Xiaodian domestic waste composting plant, and sieving through 2 mm sieve, selecting gramineous plant Festuca arundinacea from northern China, taking graphene microchip having microchip size of 0.5-20 mu m, microplate thickness of 5-25 nm, specific surface area of 40-60 m2/g, density of 2.25 g/cm3, conductivity of 8000-10000 S/m, and carbon content of more than 99.5%, taking graphene oxide having average thickness of 3.4-7 nm, slice diameter of 10-50 mu m, 5-10 layers, 100-300 m2/g specific surface area, and purity of more than 90%, taking carboxylated multi-walled carbon nanotubes with diameter of 20-40 nm, length of 10-30 mu m, carboxylic acid (-COOH) content of 1.43%, purity of more than 90 wt.%, ash content of less than 8 wt.%, specific surface area of more than 110 m2/g, and conductivity of more than 102 s/cm, and taking hydroxylated multi-walled carbon nanotubes having diameter of 20-40 nm, length of 10-30 mu m, hydroxy group (-OH) content of 1.63%, purity of more than 90 wt.%, ash content of less than 8 wt.%, specific surface area of more than 110 m2/g, and conductivity of more than 102 s/cm, (ii) (a) planting tall fescue in a PVC pipe having height of 25 cm, and diameter of 5 cm, covering the bottom of the pipe with a double gauze, setting control group (CK), where the control group does not add carbon nano-materials, taking experimental group and respectively adding graphene (G),graphene oxide (GO), carboxylated multi-walled carbon nanotube (C-CH) and hydroxylated multi-walled carbon nanotubes (C-OH), (b) filling the bottom of the each PVC pipe with 30 g sand, filling top layer with 400 g domestic waste compost and 1% (wt./wt.) carbon nano-materials to form mixed substrate of compost and nano-materials, uniformly the compost and nano-materials and placing in the pipe, carrying out static curing process for 7 days, during the curing period, maintaining the soil water holding capacity by watering, after curing the planting the F. arundinacea, where the sowing amount is 0.2 g/cm2, and (c) maintaining room temperature at 18-25 degrees C and relative humidity of 35-65% during cultivation process, maintaining the light for indoor light into the room to 6856-27090 LX, oftenly swapping the location in order to ensure consistent light, supplying water daily to ensure the required water for plant growth, after 70 days, cutting, and measuring the related indexes.