层状硅酸铁微观结构对苯酚吸附性能的影响

Influence of microstructure of layered ferric silicate on its adsorption property for phenol

采用共沉淀法将硫酸铁与水玻璃负载,制备出新型吸附剂硅酸铁,通过傅里叶变换红外光谱仪(FT-IR)、X射线粉末衍射仪(XRD)、扫描电镜(SEM)、BET和吸附-脱附表征手段测试分析,对该材料的各种物理化学性质进行表征,并系统地考察了吸附时间、吸附剂用量、温度及其溶液pH对模拟废水中苯酚吸附特性的影响。结果表明:该硅酸铁吸附剂比表面积高达560m2/g,平均孔径为3.5nm;当模拟废水中苯酚初始浓度为100mg/L,吸附剂加入量2g,吸附时间120min,吸附温度25℃,pH=7时,去除率和吸附量分别可达74%和3.7mg/g。吸附等温线拟合与Langmuir模型符合,因此其对苯酚的吸附是单分子层吸附。

A new ferric silicate adsorbent was prepared by coprecipitation method with iron sulfate and water glass.Through fourier transform infrared spectroscopy(FT-IR),X-ray powder diffractometry(XRD),scanning electron microscopy(SEM),BET,and the adsorption-desorption characterization method,the various physical and chemical properties of the material were tested and analyzed.The effects of adsorption time,adsorbent dosage,temperature and solution pH on the adsorption characteristics of phenol in simulated wastewater were systematically investigated.The results shown that the specific surface area of the adsorbent was as high as 560 m^2/g and the average pore diameter was 3.5 nm.When the initial concentration of phenol in the simulated wastewater was 100 mg/L,2 g of the adsorbent was added,the adsorption time was 120 min,the adsorption temperature was 25℃,and solution pH was 7,the removal rate and the adsorption amount were as high as 74%and 3.7 mg/g,respectively.The adsorption isotherm fit was consistent with the Langmuir model,so the adsorption of phenol was monolayer adsorption.