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阳(阴)离子复配修饰两性磁性膨润土的表面特征差异及对苯酚吸附的影响
摘要点击 109  全文点击 39  投稿时间:2017-06-22  修订日期:2017-07-25
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中文关键词  磁性  膨润土  表面活性剂  表面特征  苯酚  吸附
英文关键词  magnetic  bentonite  surfactant  characterization  phenol  sorption
作者单位E-mail
任爽 西北农林科技大学资源环境学院,杨凌 712100 rsrsfly@163.com 
孟昭福 西北农林科技大学资源环境学院,杨凌 712100;农业部西北植物营养与农业环境重点实验室,杨凌 712100 zfmeng1996@263.net 
王腾 西北农林科技大学资源环境学院,杨凌 712100  
张洋 西北农林科技大学资源环境学院,杨凌 712100  
田凯 西北农林科技大学资源环境学院,杨凌 712100  
刘伟 西北农林科技大学资源环境学院,杨凌 712100;新疆工程学院化学与环境工程系,乌鲁木齐 830091  
闫东旭 西北农林科技大学资源环境学院,杨凌 712100  
中文摘要
      以膨润土(BT)为基质,采用共沉淀法制备负载Fe3O4的磁性膨润土(MBT),在两性表面活性剂十二烷基二甲基甜菜碱(BS-12)修饰(BS-MBT)的基础上,以阳离子表面活性剂十六烷基三甲基溴化铵(CTMAB)/阴离子表面活性剂十二烷基磺酸钠(SDS)为复配修饰剂,通过湿法分别制备2种两性复配修饰磁性膨润土(BS-CT-MBT/BS-SDS-MBT),采用扫描电镜、X-射线衍射、热重、红外光谱对样品进行表征,测定磁性、比表面积和孔容等性质,通过批处理实验法对比两性复配修饰磁性膨润土对苯酚的吸附.结果表明,两性复配修饰膨润土具有良好的磁分离性能.与BS-MBT相比,BS-CT-MBT的C、N质量分数增大,复配修饰剂质量分数增加,孔容和比表面积减小,BS-SDS-MBT的C、N质量分数减小,复配修饰剂质量分数减少,孔容减小,比表面积增大.在pH 6.0的0.1 mol·L-1 NaCl溶液中各修饰剂的解吸率低于9%.各土样对苯酚的等温吸附数据符合Henry模型,以分配吸附为主,吸附量顺序为BS-CT-MBT > BS-MBT > BS-SDS-MBT > BT > MBT,修饰剂质量分数是影响苯酚吸附的决定性因素,CTMAB提升土样吸附苯酚能力的效果高于SDS.
英文摘要
      Magnetic bentonite is modified by an amphoteric surfactant (dodecyl dimethyl betaine, BS-12), then modified by a cationic surfactant (Cetyl Trimethyl Ammonium Bromide, CTMAB) and anionic surfactant (Sodium lauryl sulfonate, SDS). Amphoteric-cationic modified magnetic bentonite (BS-CT-MBT) and amphoteric-anionic modified magnetic bentonite (BS-SDS-MBT) are obtained. Structural identification of the samples were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), thermogravimetric analyses (TG), Fourier transform infrared spectra (FTIR), and vibrating sample magnetometer (VSM). The carbon-nitrogen content, specific surface area, and pore volume were also evaluated. Batch isotherm studies were conducted to evaluate the sorption of phenol. The results show that BS-CT-MBT and BS-SDS-MBT can be separated by magnetic separation. The carbon content-nitrogen content and content of surfactants of the BS-CT-MBT increase, while surface area and pore volume decrease compared to those of BS-MBT. Compared with BS-MBT, the carbon-nitrogen content, content of surfactants, and pore volume of BS-SDS-MBT are decreasing and surface area is increasing. The desorption rate of the surfactants is less than 9% at pH 6.0 and in 0.1 mol·L-1 NaCl solution. The Henry equation is the optimal description for the phenol sorption isotherms, implying a partitioning sorption process. The amount of phenol sorption follows the order:BS-CT-MBT > BS-MBT > BS-SDS-MBT > BT > MBT, which significantly correlates with the variation of the content of surfactant. Amphoteric magnetic bentonites modified by CTMAB have better absorption performance for phenol than those modified by SDS.

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