化工进展2017，Vol.36Issue(4)：1499-1505,7.DOI:10.16085/j.issn.1000-6613.2017.04.045
香蕉茎秆生物炭的制备及其对铜离子的吸附特性
The preparation of biochar from pre-oxidation of banana stem and its adsorption of Cu2+
摘要
Abstract
A novel approach was used to prepare engineered biochar from banana stem pretreated with KMnO4 through slow pyrolysis(600℃). The physicochemical properties of biochar were characterized. Batch adsorption experiments were conducted to investigate the effect of pH values,contact time, temperature and initial Cu2+ concentration on the adsorption efficiency and behaviors . The adsorption types were analyzed from the aspects of kinetic,isotherms,and thermodynamic. The results showed that the engineered biochar surface was covered with MnOx ultrafine particles. In comparison to the pristine biochar,the engineered biochar had more surface oxygen-containing functional groups and much larger surface area. The removal of the metals by the engineered biochar was mainly through surface adsorption mechanisms involving both the surface MnOx particles and oxygen-containing groups. The biochar had strong adsorption ability to Cu2+ with maximum adsorption capacities of 81.36mg/g in experiments,which was significantly higher than that of the pristine biochar. The adsorption process was consistent with the pseudo-second-order model. The process was better described by the Langmuir isotherm model.ΔG0 was negative andΔH0 was positive,indicating spontaneous and endothermic adsorption.关键词
香蕉茎秆/生物炭/铜离子/吸附Key words
banana stem/biochar/copper ion/adsorption分类
化学化工引用本文复制引用
余伟光,黎吉辉,王敦,梁振益,张玉苍..香蕉茎秆生物炭的制备及其对铜离子的吸附特性[J].化工进展,2017,36(4):1499-1505,7.基金项目
国家自然科学基金(51263006)、海南省国际合作专项(KJHZ2014-02)、海南省产学研一体化专项(CXY20150019)及海南大学服务地方经济项目(HDSF201311). （51263006）
