针对水体钒污染现象,以经磷酸浸渍的马缨丹为原料制备多孔生物炭后负载聚乙烯亚胺(PEI),得到PEI功能化多孔生物炭(PBC)。采用BET、扫描电镜(SEM)、EDS能谱和红外光谱(FT-IR)进行表征,并探究其对水中钒离子[V(Ⅴ)]的吸附。结果表明:PBC具有丰富的孔隙结构及表面官能团,比表面积和孔容分别为原始炭(LBC)的5.87倍和12.33倍;PBC和LBC对V(Ⅴ)的饱和吸附量分别为147.47mg/g和4.98mg/g;PBC对V(Ⅴ)的吸附行为符合Langmuir模型和拟二级动力学模型,可选择性高效吸附水中V(Ⅴ)并循环再生利用。PBC对V(Ⅴ)的吸附机理以静电作用、多孔吸附、络合及还原作用为主。
In view of the vanadium pollution in water,polyethyleneimine-functionalized porous biochar (PBC) was obtained by preparing porous biochar from phosphoric acid-impregnated lantana camara and then loading with polyethyleneimine (PEI).The prepared PBC was characterized by BET,SEM,EDS and FT-IR,and the adsorption capacity of sample for V(Ⅴ) was explored.The results showed that PBC had abundant pore structure and surface functional groups,and its specific surface area and pore volume were 5.87 times and 12.33 times that of biochar without modification (LBC),respectively.The saturated adsorption capacities of PBC and LBC for V(Ⅴ) in water were 147.47mg/g and 4.98mg/g,respectively.The adsorption behavior of PBC for V(Ⅴ) was consistent with Langmuir model and pseudo second-order kinetic equation.The adsorption of V(Ⅴ) in water by PBC had better selective adsorption and regeneration.Based on the experimental results and characterization analysis,the adsorption mechanism of V(Ⅴ) by PBC was dominated by electrostatic action,porous adsorption,complexation,and reduction.
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基金资助
四川省重大科技专项项目(2018SZDZX0022)
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