摘要
使用两性表面活性剂3-磺丙基十六烷基二甲基甜菜碱(HDAPS)制备了有机膨润土,并通过X射线衍射(XRD)、红外光谱(FT-IR),扫描电镜(SEM)和比表面分析(BET)对其结构进行了表征。结果表明,两性表面活性剂进入膨润土层间,增大了层间距,使膨润土的微观形貌得到改善,比表面积下降,孔径增大。加入不同改性剂添加量(n CEC)的有机膨润土对环丙沙星的吸附测试结果表明,在酸性和碱性条件下改性剂用量为0.2 CEC时吸附效果最好。环丙沙星在膨润土原土上的吸附受pH和离子强度的影响较大,在碱性条件下吸附量急剧下降,溶液中阳离子的浓度越高吸附量越小,且二价阳离子影响较大。改性后的膨润土容易分散,易于分离,吸附能力比原土提高近30%,且受pH和离子强度的影响明显小于膨润土原土。另外,改性后的膨润土对环丙沙星的吸附符合拟二级动力学模型,吸附等温线呈线性吸附。
3-（N, N-dimethylhexadecylammonio） propane sulfonate （HDAPS） was used as modifier for the preparation of organo-betonite, the resulted HDAPS-Bt was characterized by XRD, FT-IR, SEM and BET. The results show that the amphoteric surfactant successfully intercalated into the interlayer of bentonite, and expanded the basal spacing to high extent, the morphology of bentonite was improved and the specific surface area were decreased, while the pore size was enlarged. The adsorption of cipro- floxacin onto HDAPS-Bt modified with different amount of HDAPS was tested, results show that the opti- mum adsorption ratio was obtained at 0.2 CEC both in acidic and basic solutions. The pH and ionic strength in the solution had great effect on the adsorption of ClP onto raw bentonite, and adsorption ca- pacity decreased dramatically with increasing of pH and ionic strength. However, the organo-bentonite was much easier to disperse in the solution and separate from water than raw bentonite, the adsorption of CIP on HDAPS-Bt was 30% higher than that on Bt, furthermore, pH and ionic strength had less effect on the adsorption of CIP onto HDAPS-Bt in comparison with raw bentonite. The adsorption experiment re- sults show that pseudo-second-order was best for the description of kinetics and the adsorption isotherm was nearly linear.
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
2013年第6期576-582,共7页
Chinese Journal of Materials Research
关键词
无机非金属材料
膨润土
改性
两性表面活性剂
环丙沙星
吸附
inorganic non-metallic materials, bentonite, modification, zwitterionic surfactant, cipro-floxacin, adsorption
