【摘要】 采用无机羟基铝及阳离子表面活性剂十六烷基三甲基溴化铵对天然蒙脱石进行无机及复合改性。在吸附过程中研究了反应时间、投加量和pH等变量对吸附性能的影响,同时进行吸附动力学及吸附等温线研究,吸附规律符合Langmuir等温方程式。采用X射线衍射、X射线荧光、傅里叶红外光谱等表征手段对未改性及改性蒙脱石进行性能表征。研究结果表明,羟基铝及复合改性蒙脱石对As(V)具有良好的吸附性能,在pH为4～10,初始砷浓度为2 mg/L,改性蒙脱石对As(V)的去除率接近99%。吸附机理主要为羟基铝表面络合吸附和静电吸附。更多还原

【Abstract】 The inorganic and inorganic-organic pillared montmorillonite were prepared using aluminium hydroxypolycation and cetyltrimethyl ammonium bromide(CTMAB).The effects of reaction time,dosage,pH on adsorption efficiency were investigated,as well as the adsorption isotherms and kinetics.The adsorption isotherms fitted well with Langmuir isothermal equation.The characteristics of natural and modified montmorillonite were characterized by X-ray diffraction(XRD),X-ray fluorescence(XRF),Fourier transform infrared spectrum(FTIR),et al.The results showed that polymeric Al and inorganic-organic modified montmorillonite presented good adsorption towards As(V),under the condition with pH of 4~10 and initial As(V) concentration of 2 mg/L,the adsorption efficiency could exceed 99%.The sorption mechanisms were surface adsorption and electrostatic adhesion.更多还原