Study On Salix Biochar On Copper Pollution Improvement

Biomass carbon has been widely used in environmental remediation due to its good physical structure and abundant surface area.The Salix is made into the biochar after a high-temperature and oxygen limited environment.This could not only avoid the waste of biomass resource but also make use of its ability of Salix to repair the pollution of heavy metals in soil.In this paper,we take Fenglei copper mine in Xilin Gol League as a case study.After the investigation and evaluation of heavy metal pollution,we find out the main heavy metal in our study area.Then we test the adsorption of Cu2+ in aqueous solution under different adsorption conditions to explore the absorptive property of Salix biochar and take Agropyron cristatum,the local dominant species,as subject investigated to find the the migration of copper in soil and plants based on single factor pollution index method.The ratio of different pollution levels are determined by collecting tailings and unpolluted grassland soil,which are 0%(ck),2.5%(mild pollution),5%(moderately polluted),7.5%(heavily polluted).The main,conclusions are as follows:1.The study area was influenced by northwest wind.The spatial distribution pattern of heavy metal in mining area was that:the southeast was the largest,followed by the northeast and southwest,the northwest was the smallest which the Cu and Cd were heavily polluted.And the single pollution index Pi of Cu was 18.59,and the single pollution index Pi of Cd was 4.42,were outclass than the severe pollution standard(Pi>3).Therefore,Cu was identified as the main contaminated metal in the soil.2.The Salix biochar adsorption of Cu2+ in water was a complex adsorption process on the surface and inside.Pseudo-second-order model,the intraparticle diffusion model were more suitable to describe the adsorption kinetic(R2>0.99)and isothermal adsorption process(R2>0.56)of Cu2+ on Salix biochar.The maximum adsorption capacity of Salix biochar on solution Cu2+ was 19.13 mg/g.After 16h,Salix carbon on Cu2+ adsorption capacity and adsorption rate reached equilibrium.3.Under the conditions of mild,moderate and severe pollution,with the increase of the proportion of added biochar,the concentration of copper in the various parts decreased.And the enrichment degree of each part is as follows:the root ofagropyron cristatum>soil>stems and leaves of agropyron cristatum.Under the conditions of mild,moderate and severe pollution,when the biological carbon add ratio 1%,the migration coefficient of copper in soil-agropyron cristatum,were 0.05,0.05,0.04 respectively.The addition of 0.8%-1%Salix biochar showed optimal performance for both soil and agropyron cristatum.