纳米零价铁磁性生物炭对水中2,4,6-三氯酚吸附机理及动力学研究  

Kinetics and mechanism of 2,4,6-trchlorphenol adsorp tion from aqueous solution onto nZVI-MBC

作　　者：韦学玉[1,2] 刘志刚[2,3] 徐晓平[1] 

机构地区：[1]安徽工程大学建筑工程学院,安徽芜湖241000 [2]河海大学环境学院,江苏南京210098 [3]宁波市自来水有限公司,浙江宁波315041

出　　处：《河南城建学院学报》2016年第5期73-77,共5页Journal of Henan University of Urban Construction

基　　金：安徽工程大学青年科研基金(2016YQ34);安徽省高等学校自然科学研究重点项目(KJ2016A063)

摘　　要：利用黄豆壳合成纳米零价铁磁性生物炭（n ZVI-MBC）材料,运用X射线衍射（XRD）和透射电子显微镜（TEM）对其理化性质进行表征,探讨其对2,4,6-三氯苯酚（2,4,6-TCP）吸附机制,并考察溶液p H和n ZVI-MBC投加量等因素对吸附效果的影响。表征结果显示：n ZVI-MBC成功负载了α-Fe,且颗粒近似球形,呈团聚状。实验结果表明：n ZVI-MBC在p H为5～8出现阶段性吸附,吸附效果较好。n ZVI-MBC对2,4,6-TCP的吸附与二级动力学模型拟合度较好,且符合Langmuir吸附等温线方程,吸附过程主要受快速反应控制,降低反应温度有利于生物炭对水中2,4,6-TCP的吸附。A skillful method access to new nano-zero valent iron magnetic biochar composites（ n ZVI-MBC）were synthesized by using Soybean hulls. The as-prepared n ZVI-MBC was used as an adsorbent for the removal of 2,4,6-TCP from aqueous solution. X-ray diffraction（ XRD）,transmission electron microscopy（ TEM） was used to characterize the properties of n ZVI-MBC effect of variable parameters such as p H value,contact time,initial concentration of metal ions and adsorption properties of n ZVI-MBC on 2,4,6-TCP was studied. Characterization showed that α-Fe successfully loaded on n ZVI-MBC,the particles were nearly spherical with agglomeration. The results of experiment indicated that phase adsorption performs during 5-8 of p H. The adsorption kinetics of 2,4,6-TCP onto n ZVI-MBC were better fitted by pseudo-second-order kinetic. The adsorption iso-therm data were fitted well to Langmuir isotherm model. Here n ZVI-MBC can be used as low cost-effective material for the removal of 2,4,6-TCP from aqueous solution with a simple magnetic separation process.

关 键 词：纳米零价铁磁性生物炭 黄豆壳 2 4 6-三氯酚 吸附 

分 类 号：X703[环境科学与工程—环境工程]