文档介绍：: .
环境工程
比为 1 : 12 的 GMB600-12 表现出最佳吸附性能，最大吸附容量为 mg/g；3) 准二级动力学揭示 Cr(Ⅵ)的吸
附主要以化学吸附为主， Langmuir 模型和 Freundlich 模型都能很好地描述 GMB 对 Cr (VI) 的吸附特征；4)XPS 的
结果进一步表明 GMB 去除水溶液中 Cr(Ⅵ)是氧化还原和表面吸附协同作用的结果。
关键词：生物炭；针铁矿；Cr(Ⅵ)；吸附
PREPARATION OF GOETHITE-MODIFIED BIOCHAR AND ITS
ADSORPTION CAPACITY FOR Cr(Ⅵ)
WANG Zi-ting, ZOU Jia-wei, ZHOU Ji-ti, JIN Ruo-fei*
(School of Environmental Science and Technology, Dalian University of Technology, Dalian, 116024, China)
Abstract：Goethite-modified biochar (GMB) was prepared by hydrolytic co-precipitation under different
pyrolysis temperature and raw material ratio, characterized by SEM-EDS, XRD, FTIR and XPS. Adsorption
experiments of Cr(Ⅵ) for exploring the adsorption performance and mechanism were carried out. The results
showed that: 1) modification with goethite formed iron hydroxyl oxide (FeOOH) on the surface of biochar and
greatly improved its adsorption capacity; 2) the best adsorption capacity of mg/g was performed by
modified biochar GMB600-12 with pyrolysis temperature at 600 ℃ and mass ratio of biochar and
(Fe(NO3)3·9H2O) at 1:12; 3) the adsorption of Cr(Ⅵ) was mainly chemisorption as revealed by quasi-second-
order kinetics, and both Langmuir model and Freundlich model could describe the adsorption characteristics of
Cr(VI) by GMB well; 4) the removal of Cr(Ⅵ) from aqueous solution by GMB is a synergistic effect of redox
and surface adsorption.
Keywords：biochar；goethite；Cr(Ⅵ)；absorption
0 引 言
生物炭是由生物质原料在无氧或限氧条件下经高温热解、气化、水热炭化等热化学分