摘要
以玉米芯为原料制备生物炭,采用扫描电镜及N_2吸附等温线对其表面形貌及孔结构进行了表征,通过批次吸附试验,研究了其对水中Pb(II)的吸附行为。结果表明:玉米芯生物炭对Pb(II)的吸附在120 min达到平衡,吸附过程符合准二级动力学方程。Langmuir吸附模型能够很好地模拟吸附等温线,最大饱和吸附量为79.36 mg/g。热力学结果显示:玉米芯生物炭对Pb(II)的吸附主要以化学吸附为主,升高温度有利于吸附。在Cd(II)共存的条件下,玉米芯生物炭对Pb(II)的吸附受到一定的抑制。
The biochar was prepared by using corncob as raw materials.The Scanning Electronic Microscopy and N2 adsorption isotherms were used to characterize surface pattern and pore structure of corncob biochar.The adsorption property of corncob on Pb(II)in water was studied by batch sorption technique.The results indicated that the adsorption of Pb(II)on corncob biochar reached equilibrium within 120 min.The pseudo-second-order kinetic model was suitable for the adsorption of Pb(II).The adsorption data could be fitted by Langmuir model and the maximum adsorption capacity was 79.36 mg/g.The thermodynamics results showed that chemical adsorption was predominant in the adsorption process and increasing temperature was beneficial to the adsorption.Under the condition of Cd(II)coexistence,the adsorption of Pb(II)on corncob biochar was restrained.
作者
贾丹
王丽敏
黄进文
JIA Dan;WANG Li-min;HUANG Jin-wen(College of Resources and Environmental Engineering,Jilin Institute of Chemical Technology,Jilin 132022,Jilin,China)
出处
《粮食与油脂》
北大核心
2019年第2期41-45,共5页
Cereals & Oils
