Preparation of magnetic Fe3O4/Fe-algal residue carbon-based functional materials by ball milling and their adsorption of copper and zinc in aquaculture wastewater
To study the adsorption effect of magnetic Fe3O4/Fe-algae slag on copper and zinc in aquaculture wastewater.By changing the initial concentration,initial pH,adsorption time and the amount of magnetic Fe3O4/Fe-algae slag,the best adsorption conditions were obtained by changing the fitting parameters of copper and zinc adsorption in the simulated wastewater.When pH was 5.0,and the amount of magnetic Fe3O4/Fe-algae slag was 0.5 g/L,the removal rate of Cu2+(99.88％)and the adsorption amount(19.98 mg/g)reached the maximum value;under the same pH conditions,when the amount of magnetic Fe3O4/Fe-algae slag carbon based functional material was 1.5 g/L,maximum removal rate of Zn2+(99.73％).At this time,the adsorption capacity was 7.979 mg/g.When pH was 6.0,and the amount of carbon-based functional materials of algae slag was 0.5 g/L,adadsorption to Zn2+(19.91 mg/g)reached the maximum,the removal rate at this time was 82.98％,the fitting parameters of the adsorption kinetic model and the adsorption isothermal model showed that the adsorption process of Cu2+and Zn2+by carbon-based functional materials of algae residue was more in line with the quasi-first-order kinetic equation and Freundlich model,and the adsorption process was a multi-molecular layer adsorption dominated by physical action.The magnetic Fe3O4/Fe-algae slag carbon-based functional material adsorption treatment of copper and zinc in aquaculture wastewater was remarkable,which could be used as an efficient adsorbent for the removal of heavy metals in aquaculture wastewater.
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