水热法制备玉米叶基生物炭对亚甲基蓝的吸附性能研究

发布时间：2018-06-30 09:36

本文选题：玉米叶 + 玉米秆　；参考：《环境科学学报》2017年07期

【摘要】：以农业废弃物玉米叶和玉米秆为原材料,采用水热法制备生物炭,通过批试验方法考察了接触时间、污染物初始浓度、生物炭投加量、反应体系温度及溶液p H值等因素对2种生物炭吸附亚甲基蓝的影响,并对吸附规律进行了探讨.吸附动力学拟合结果发现,准二级动力学能更好地拟合吸附过程(R~2=0.9986~0.9999);颗粒内扩散方程拟合结果表明,2种生物炭对亚甲基蓝的吸附由液膜扩散和颗粒内扩散2个过程控制.玉米叶基生物炭对亚甲基蓝的吸附可以通过Freundlich方程来进行拟合(R~2=0.9898),说明吸附在生物炭表面是多分子层吸附过程;而玉米杆基生物炭对亚甲基蓝的吸附更符合Langmuir方程(R~2=0.9825),说明吸附在生物炭表面是单分子层吸附过程.与玉米杆基生物炭相比,玉米叶基生物炭具有更好的吸附性能,拟合理论最大吸附量为玉米杆基生物炭的1.25倍.
[Abstract]:Using corn leaves and stalks as raw materials, biochar was prepared by hydrothermal method. The contact time, the initial concentration of pollutants and the amount of biochar were investigated by batch test. The effects of reaction system temperature and pH value of solution on the adsorption of methylene blue by biochar were studied. The results of adsorption kinetics fitting showed that the quasi-second-order kinetics could better fit the adsorption process (R ~ (2 +) 0.9986 ~ (0.9999), and the results of diffusion equation in particles showed that the adsorption of methylene blue to methylene blue by two kinds of biochar was controlled by liquid membrane diffusion and intraparticle diffusion. The adsorption of methylene blue on maize leaf based biochar can be fitted by Freundlich equation (RP20.9898), which indicates that adsorption on the surface of biochar is a multilayer adsorption process. The adsorption of methylene blue on corn-based biochar was more consistent with Langmuir equation (R _ (2) O _ (0.9825), indicating that adsorption on the surface of biochar was a monolayer adsorption process. Compared with corn-based biochar, maize leaf-based biochar has better adsorption performance, and the maximum adsorption capacity of corn-based biochar is 1.25 times of that of corn-based biochar.
【作者单位】：渤海大学化学化工学院环境科学与工程系;
【基金】：国家自然科学基金(No.51508026) 渤海大学博士启动基金(No.bsqd201415)~~
【分类号】：X791

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