▎ 摘　　要

NOVELTY - The fixing method of heavy metal of lawn compost substrate using graphene involves: (1) taking garbage compost for test development material from Tianjin small deposition of domestic garbage compost treatment plant, and sieving over 2 mm, where the graphene microchip carbon nanomaterials have 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 greater than 99.5%, and the graphene oxide carbon nanomaterials have average thickness of 3.4-7 nm. USE - The method is useful for fixing heavy metal of lawn compost substrate using graphene, where the substrate is useful for improving the adsorption of heavy metals on lawn living garbage compost matrix system (claimed). DETAILED DESCRIPTION - The fixing method of heavy metal of lawn compost substrate using graphene involves: (1) taking garbage compost for test development material from Tianjin small deposition of domestic garbage compost treatment plant, sieving over 2 mm, where the graphene microchip carbon nanomaterials have 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 greater than 99.5%, and the graphene oxide carbon nanomaterials have average thickness of 3.4-7 nm, sheet diameter of 10-50 mu m, layers of 5-10 layers, specific surface area of 100-300 m2/g and purity of greater than 90%, and selecting Festuca arundinacea as common gramineous plant in northern China; and (2) (2a) planting F.arundinacea in PVC pipe having height of 25 cm and diameter of 5 cm, covering the bottom of PVC pipe with double gauze, setting experimental control group (A), where the control group (A) did not add carbon nanomaterials, adding experimental groups to graphene carbon nanomaterials and graphene oxide carbon nanomaterials, (2b) filling each bottom of the PVC pipe with 30 g sand, filling top layer of the PVC pipe with 400 g municipal solid waste compost and 1 wt./wt.% graphene microchip carbon nanomaterials or 1 wt./wt.% graphene oxide carbon nanomaterials to form mixed matrix of compost and nanomaterials, uniformly mixing carbon nanomaterials and composts, then putting into tube, carrying out static curing for 7 days, maintaining water holding capacity of soil by watering during curing period, and curing after planting F.arundinacea, where the sowing rate is 0.2 g/cm2, and (2c) penetrating natural light into room during culturing period at room temperature of 18-25 degrees C and relative humidity of 35-65%, frequently replacing position to ensure consistent light, maintaining the water content of compost to maximum 70% to ensure the water needed for plant growth, cutting for 70 days, and measuring the related index after air drying. An INDEPENDENT CLAIM is included for use of heavy metal of lawn compost substrate for improving the adsorption of heavy metals on lawn living garbage compost matrix system.