期刊
JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
卷 38, 期 11, 页码 1665-1674出版社
TAYLOR & FRANCIS INC
DOI: 10.1080/01932691.2016.1272058
关键词
Adsorption; Cr (VI); magnetic biochar
资金
- Wuhan International Science and Technology Cooperation Project [2016030409020221, 2015030809020369]
- Ministry of Housing and Urban-Rural Development [2015ZX07309001, 2016K4032]
Magnetic biochar, as an adsorbent, was synthesized by a single step method, where iron salt was directly mixed with pinewood sawdust by chemical co-precipitation and subsequently pyrolyzed at 700 degrees C for Cr (VI) removal from aqueous solution. The effects of some important parameters including adsorbent dosage (0.4-2.8g/L), pH (1-10) of the solution, contact time (0-1440 minutes), initial concentration (30-120mg/L), and temperature (20-40 degrees C) were investigated in batch experiments. Both pre- and post-adsorbents were characterized by SEM-EDX and XPS to investigate the adsorption mechanism. The maximum adsorption capacity of the tested magnetic biochar under the certain experimental conditions determined as optimal was 42.7mg/g for Cr (VI). The adsorption data were proved to be suitable for the pseudo-second order model for kinetics and the Langmuir model for isotherms with correlation R-2=0.9996 andR(2)>0.9980, respectively, after fitting with four kinetic models (pseudo-first order, pseudo-second order, W-M model, and Elovich) and three isotherm models (Langmuir, Freundlich, and Temkin). The characteristic analyses further verified that the efficient particle was a mixture of iron oxides in essence, and it had a strong effect on the spontaneous and endothermic adsorption process.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据