▎ 摘　　要

NOVELTY - Controlling adsorption of cadmium by using carbon nano material in single system comprises (i) taking test waste compost from Tianjin Xiaodian household waste composting plant, sieving, selecting Northern common grass of tall fescue, taking graphene microchip, graphene oxide, carboxylated multi-walled carbon nanotubes and hydroxylated multi-walled carbon nanotubes, and (ii) adding carbon nano material into conical flask, adding cadmium(II) ion single ion solution, adjusting pH, oscillating, filtering the solution, and determining residual concentration of metal ions in filtrate. USE - The method for controlling adsorption of cadmium by using carbon nano material in single system and increasing adsorption rate of heavy metals, preferably cadmium by using isothermal adsorption (all claimed). ADVANTAGE - The method enhances the adsorption speed of the heavy metal. DETAILED DESCRIPTION - Controlling adsorption of cadmium by using carbon nano material in single system comprises (i) taking test waste compost from Tianjin Xiaodian household waste composting plant, and sieving through 2 mm sieve, selecting Northern common grass of tall fescue (Festuca arundinacea), 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) adding 50 mg carbon nano material into 150 ml conical flask, adding 100 ml and 100 mg/l cadmium(II) ion single ion solution, adjusting the pH to 6, and respectively oscillating at room temperature for 1 minute, 3 minutes, 5 minutes, 10 minutes, 15 minutes, 30 minute, 1 hour, 2 hours, 4 hours, 8 hours, and 24 hours, quickly filtering the solution, and determining residual concentration of metal ions in filtrate by atomic absorption spectrophotometry, and (b) taking solution containing cadmium(II) ions in different concentrations, using solution containing 0.01 mol/l sodium nitrate as supporting electrolyte, using sodium hydroxide or nitric acid to adjust the acidity of heavy metal solution until the pH of the solution is 6, where the concentration of cadmium is 10, 25, 50, 100, 150 and 200 mg/l, adding 10 mg carbon nano material into 100 ml conical flask, respectively adding 20 ml single heavy metal solution with different concentrations in the flask, shaking for 6 hours, filtering, analyzing the filtrate by using an atomic absorption spectrophotometer, using TAS-990 for measuring heavy metal concentrations, and calculating the adsorption according to the difference of heavy metal ions concentration before and after the adsorption experiment.