铁改性海泡石的研制及吸附锑特性

PREPARATION OF IRON MODIFIED SEPIOLITE AND ITS ADSORPTION CHARACTERISTICS OF ANTIMONY

用氯化铁对海泡石进行改性制得铁改性海泡石(IMS),采用扫描电镜、傅立叶红外光谱、比表面积和孔径分析仪对改性前后的海泡石进行了表征,以锑为目标污染物,考察了IMS吸附锑的影响因素以及吸附锑后IMS的再生特性。结果表明,改性后的海泡石表面变得粗糙多孔,比表面由37.015m2·g-1提高到145.958m2·g-1,平均孔径由3.784nm减小为2.443nm,表面孔径主要分布在2～50nm;红外谱图在3663cm-1和1428cm-1处显示了明显羟基峰值;IMS对锑的吸附规律符合Freundlich等温吸附式;吸附后IMS可通过NaOH溶液再生,以0.1mol·L-1碱的再生效果最佳。

Sepiolite was subjected to the impregnation with the iron（Ⅲ）-containing solution to get IMS（iron modified sepiolite）. Scanning electronic microscopy（SEM）, infrared spectra （FTIR） and specific surface area （BET） measurement were used to characterize its surface. Several factors, which affected the antimony adsorption on IMS and regeneration of IMS were investigated too. The results indicated that： after modification the surface of IMS appeared roughened and porous, and its surface area increased from 37.015m^2·g^-1 to 145.958m^2·g^-1 while pore diameter decreased from 3.784 nm to 2.443nm, and modification provided IMS with 2-50 nm pore diameters. From FTIR data, it showed that the surface-OH uptakes increased greatly at 3663cm^-1 and 1428cm^-1, and the Freundlich isotherm was the best-fit adsorption isotherm model for the experimental data. IMS could be regenerated with NaOH and the optimum concentration was 0.1mol·L^-1.