Study On The Composite Adsorption Of Reed Active Carbon On Cu(?) And Cr(?)

The sources of heavy metal wastewater not only come from industrial and mining enterprises such as metal smelting,processing and electric transmission,but also agricultural activities,The source of heavy metal wastewater comes from not only metal smelting,processing and electric ferry enterprises,but also agricultural activities.If the wastewater is directly discharged into the water body,it not only affects the self purification and pollution of the water body,but also causes the health and safety of human life.In addition,the heavy metals discharged into the water body become complex because of the complexity of their components.On the basis of previous research,the study on the removal of heavy metal compound pollution can make up for the shortcomings of the research in this field.On the other hand,it has a certain guiding significance for metal processing enterprises to choose the treatment methods of heavy metal wastewater.The active charcoal of three different sources,reed activated carbon?H-AC?prepared by H₃PO₄ activation method,and two kinds of activated carbon?B-AC,C-AC?as adsorbents,were used as raw materials of aquatic plant reed.The surface physicochemical properties were characterized by SEM,N₂ adsorption desorption isotherm,BET aperture analysis,FT-IR and Beohm titration.The effects of adsorption time,initial concentration,pH,ionic strength and dosage on adsorption were investigated.The adsorption mechanism of the three kinds of activated carbon on Cu???,CrCr???and its composite pollution was studied by using the kinetic model and the isotherm model.At the same time,the regeneration of activated carbon was regenerated with HNO3,NaOH and SAG solution.The purpose of this study was to compare the effects of different activators,regeneration time and regenerator frequency on the regeneration effect.The main conclusions of this paper are as follows:?1?The maximum adsorption capacity of H-AC under the combined pollution of Cu???and CrCr???is respectively:40.08mg/g?42.73mg/g;The maximum adsorption capacities of B-AC for Cu???and CrCr???are respectively:13.93mg/g?8.8mg/g;The maximum adsorption capacities of C-AC for Cu???and CrCr???are respectively:28.49mg/g?11mg/g.From the above data,it is obvious that H-AC has strong adsorption capacity under the combined pollution of Cu???and CrCr???.?2?The results of SEM and aperture analysis BET show that the specific surface area and pore volume of H-AC are greater than B-AC and C-AC,and their specific surface area is as high as 791.9573m²/g and the total pore volume is 0.544081m³/g.FT-IR and Boehm results showed that H-AC,B-AC and C-AC contained carboxyl,lactone and phenolic hydroxyl groups.Through the isotherm model fitting,it is found that the adsorption process of H-AC and C-AC conforms to the Langmuir isothermal characteristic,and the B-AC adsorption process accords with the Freundlich isothermal characteristic.Through the kinetic model fitting,it was found that both B-AC and C-AC were in accordance with the pseudo two order kinetic process,and the adsorption of Cu???to Cu???was in accordance with the pseudo first order kinetic process,and the adsorption of CrCr???was in accordance with the pseudo first order kinetics.?3?The regenerating of three kinds of activated carbon can be achieved by HNO₃,NaOH and SAG as regenerator.The three regenerators have similar effects on the regeneration of activated carbon adsorbed on Cu???,and SAG is better than HNO₃ and NaOH for the regeneration of CrCr???activated carbon.In the Regeneration Experiment of activated carbon adsorbed Cu???,the regeneration time was the most important factor affecting the regeneration effect.In the experiment of adsorption of CrCr???on the regeneration of activated carbon,the species of regenerative agent had the greatest influence on the regeneration effect.The regeneration time is controlled by 3H,which can achieve better regeneration effect.