(1. 吉首大学 生物资源与环境科学学院，吉首 416000；
2. “锰锌钒产业技术”湖南省2011协同创新中心，吉首 416000)
摘 要: 以槟榔渣(Waste areca，WA)为原料在氩气气氛中于450 ℃碳化45 min制备槟榔渣烧结碳(ACWA)，采用X射线衍射、扫描电镜、碘吸附值测定、比表面测定等对其性能进行表征。结果表明，制备的烧结碳为多孔的碳材料，平均孔径为4.25 nm，比表面积和碘吸附值分别达到742.53 g/m2和1241.82 mg/g。以ACWA为吸附剂，对废水中Mn(Ⅱ)的吸附进行研究，考察ACWA用量、溶液pH值和共存离子 (Na+、NH4+、Mg2+、Ca2+和Al3+)等因素对吸附效果的影响，并对吸附等温线和吸附动力学进行研究。结果表明：ACWA对Mn(Ⅱ)具有良好的吸附作用，对浓度为180 mg/L的Mn(Ⅱ)废水在60 min内可实现最大吸附容量34.28 mg/g，Mn(Ⅱ)吸附率高达95.2%。热力学和动力学研究表明，ACWA对Mn(Ⅱ)可用Langmuir吸附等温方程来描述，而吸附动力学符合准二级动力学模型。机理研究表明，由于表面具有丰富的负电性官能团，ACWA主要通过化学络合和静电吸附作用而实现对废水中Mn(Ⅱ)的高效去除。
关键字: 槟榔渣；锰离子；吸附性能；废水处理
（1. College of Biology and Environmental Sciences, Jishou University, Jishou 416000, China;
2. The Collaborative Innovation Center of Manganese-Zinc-Vanadium Industrial Technology, The 2011 Plan of Hunan Province, Jishou 416000, China）
Abstract:Activated carbon materials derived from waste areca (ACWA) were prepared by calcinating the waste areca(WA) at 450 ℃ for 45 min under argon atmosphere and characterized by X-ray diffractometry (XRD), scanning electron microscopy (SEM), iodine adsorption value and specific surface area measurements. The adsorption performance of ACWA on Mn(Ⅱ) was investigated by analyzing the effects of dosage of ACWA, solution pH and coexisting cations (Na+, NH4+, Mg2+, Ca2+ and Al3+) in combination with the study of dynamic and thermodynamic characteristics. The results show that the prepared ACWA is a mesoporous carbon material with average pore diameter of 4.25 nm, specific surface area of 742.53 g/m2 and iodine adsorption value of 1241.82 mg/g. ACWA is an excellent adsorbent for Mn(Ⅱ) and the maximum adsorption capacity of 34.28 mg/g and adsorption rate of 95.2% can be obtained for waste water with 180 mg/L Mn(Ⅱ) in 60min. The Langmuir model fits well to the equilibrium data and the kinetics of the adsorption are well described by the pseudo-second order model. Adsorption mechanism analysis indicate that the efficient removal of Mn(Ⅱ) by ACWA is achieved by means of chemical complexion and/or electrostatic adsorption between electropositive Mn(Ⅱ) and electronegative functional groups on the surface of ACWA.
Key words: waste areca; Mn(Ⅱ); adsorption performance; wastewater treatment
