摘要
以玉米秸秆为原料制备生物炭,通过加碱沉淀的方式对生物炭进行改性,并通过静态及动态实验分析了其对水中As(Ⅲ)的吸附机理及性能。结果表明,静态吸附符合准二级动力学模型以及Freundlich等温吸附模型,对As(Ⅲ)的吸附过程以非均匀多分子层的化学吸附为主,铁锰改性生物炭(FMBC)的最大静态吸附容量为20.63 mg/g;FMBC吸附As(Ⅲ)的适宜pH范围广,但共存物质中PO_(4)^(3-)、SiO_(3)^(2-)对吸附效果影响较大;进水流量及进水As(Ⅲ)浓度会影响动态吸附的有效床体积,Thomas模型和Yoon-Nelson模型对动态吸附曲线都有较好的拟合效果;在进水As(Ⅲ)浓度为200μg/L、流量为9 mL/min时,FMBC的最大动态吸附容量为1.41 mg/g。本研究可为FMBC处理含As(Ⅲ)废水的应用提供必要的数据支撑。
Biochar was prepared from corn straw and modified by alkali precipitation,and its adsorption mechanism and properties on As(Ⅲ)in water were analyzed through static and dynamic experiments.The results showed that the static adsorption was consistent with the pseudo-second-order kinetic model and Freundlich isothermal adsorption model.The adsorption process of As(Ⅲ)was mainly chemical adsorption of heterogeneous multilayer.The maximum static adsorption capacity of Fe-Mn modified biochar(FMBC)was 20.63 mg/g.FMBC had a wide range of suitable pH for adsorption of As(Ⅲ),but PO_(4)^(3-) and SiO_(3)^(2-) of the co-existing substances had great influence on the adsorption effect.The influent flow rate and As(Ⅲ)concentration could affect the effective bed volume of dynamic adsorption.Both Thomas model and Yoon-Nelson model had a good fitting effect on the dynamic adsorption curve.When the concentration of As(Ⅲ)was 200μg/L and the flow rate was 9 mL/min,the maximum dynamic adsorption capacity of FMBC was 1.41 mg/g.This study can provide necessary data support for the application of FMBC in treating wastewater containing As(Ⅲ).
作者
张路
刘长青
殷悦
矫辰
张国闽
ZHANG Lu;LIU Changqing;YIN Yue;JIAO Chen;ZHANG Guomin(School of Environmental and Municipal Engineering,Qingdao University of Technology,Qingdao 266525,China)
出处
《青岛理工大学学报》
CAS
2024年第5期76-85,93,共11页
Journal of Qingdao University of Technology
基金
国家重点研发计划资助项目(2020YFD1100303)。