Study on Preparation of Deciduous Biochar Materials and Removal of Heavy Metal Ions from Industrial Wastewater
Leaves were used as raw materials to prepare biochar materials,and Pb(Ⅱ)solution was used to simulate industrial wastewater polluted by heavy metals.The effects of the addition amount,pH value,adsorption time,adsorption temperature and initial concentration of biochar materials on the removal effect of heavy metal lead ions were investigated through single-factor experiments.The adsorption kinetics and adsorption isotherm of the adsorption process were determined by fitting.The effect of removing heavy metal ions was simulated by competitive adsorption,and the regeneration performance of biochar was studied by recycling.Through experimental study,it was found that the optimal removal rate of heavy metal lead ions from biochar materials could reach 84.8％,and the maximum saturated adsorption capacity was 33 mg/g.Adsorption was a complex process controlled by reaction rate and diffusion,and the pseudo-second-order dynamic equation and Langmuir isothermal adsorption model could well fit this process.Biochar still has a high removal rate of Pb(Ⅱ),and after 3 cycles of regeneration,the removal rate can still reach 64.8％.
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