摘要
针对重金属废水污染严重和处理难度大的问题,以典型污染物Cr(Ⅵ)为目标污染物,分别通过热解法和插层法制备了蒙脱土(MT)/改性生物炭(ZBC)复合材料,表征了复合材料的微观结构,系统考察了MT和ZBC复配比例、吸附剂投加量、pH和初始浓度等因素对复合材料吸附Cr(Ⅵ)效果的影响,并深入探讨了吸附动力学、等温线及热力学特性。结果表明,通过热解法和插层法制得的MT/ZBC复合材料表面粗糙且具有一定孔隙,表面官能团丰富,MT的层状结构与ZBC的孔隙结构成功复合。两种复合材料对Cr(Ⅵ)具有良好吸附效果,且均优于单一ZBC和MT材料。热解和插层复合材料的最佳m(MT)∶m(ZBC)分别为2∶1和1∶1.5。酸性环境(pH为2~4)有利于复合材料对Cr(Ⅵ)的吸附,Cr(Ⅵ)吸附量与Cr(Ⅵ)初始浓度呈正相关,与吸附剂投加量呈负相关。吸附过程符合准二级反应动力学模型和Freundlich等温模型,表明吸附以化学作用为主且发生于非均质表面。随循环使用次数增加,两种复合材料对Cr(Ⅵ)的吸附性能逐渐降低。
To address the issues of severe heavy metal wastewater pollution and the scarcity of effective treatment methods,the typical pollutant Cr(Ⅵ)was selected as the research object,montmorillonite(MT)/modified biochar(ZBC)composites were prepared via pyrolysis and intercalation methods,respectively,and the microstructure of the composite materials was characterized.The effects of factors such as MT-to-ZBC compounding ratio,adsorbent dosage,pH,and initial concentration on the Cr(Ⅵ)adsorption performance of the composite materials were systematically investigated.Moreover,the adsorption kinetics,isotherms,and thermodynamic characteristics were thoroughly discussed.The results indicated that the MT/ZBC composite materials prepared by pyrolysis and intercalation methods exhibited rough surface,certain pores,and rich surface functional groups.The layered structure of MT was successfully combined with the pore structure of ZBC.Both composite materials demonstrated good adsorption effects on Cr(Ⅵ),outperforming the single ZBC and MT materials.The optimal m(MT)∶m(BC)ratios for the pyrolysis and intercalated composites were 2∶1 and 1∶1.5,respectively.An acidic environment(pH 2-4)was conducive to the adsorption of Cr(Ⅵ)by the composite materials.The adsorption capacity of Cr(Ⅵ)was positively correlated with the initial Cr(Ⅵ)concentration and negatively correlated with the adsorbent dosage.The adsorption process conformed to the pseudo-second-order reaction kinetics model and the Freundlich isothermal model,indicating that the adsorption was mainly chemical and occured on heterogeneous surfaces.With the increase of the number of cycles,the adsorption performance of the two composite materials for Cr(Ⅵ)gradually decreased.
作者
王子暄
韩志勇
张艳侠
魏新鹏
卢巧巧
刘润桢
WANG Zixuan;HAN Zhiyong;ZHANG Yanxia;WEI Xinpeng;LU Qiaoqiao;LIU Runzhen(School of Petrochemical Engineering,Lanzhou University of Technology,Lanzhou 730050,China;Weihe Thermal Power Plant,Datang Shaanxi Power Generation Co.,Ltd.,Xianyang 710065,China)
出处
《工业水处理》
北大核心
2025年第9期145-152,共8页
Industrial Water Treatment
关键词
改性生物炭
蒙脱土
复合材料
六价铬
吸附
modified biochar
montmorillonite
composite materials
Cr(Ⅵ)
adsorption
作者简介
第一作者:王子暄(2000-),硕士,E-mail:2034295722@qq.com;通讯作者:韩志勇,博士,副教授,E-mail:34052452@qq.com。
