膨润土负载硫化纳米零价铁去除对硝基苯酚的研究

The removal of p-nitrophenol by sulfidated nano-zero valent iron supported by bentonite

以具有较大比表面积和良好吸附性能的膨润土作为载体,制备了膨润土负载硫化纳米零价铁,并利用X射线光电子能谱(XPS)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)以及比表面积等手段表征膨润土负载硫化纳米零价铁的特性。研究了膨润土负载硫化纳米零价铁的硫铁比(摩尔比)、投加量、初始pH对对硝基苯酚(PNP)去除的影响,并对PNP降解机理进行了初步探究。结果表明,膨润土负载硫化纳米零价铁比表面积为33.06m^2/g,大于膨润土的比表面积(26.72m^2/g),负载的纳米零价铁颗粒分散均匀。当硫铁比为0.011 2、投加量为0.5g/L、初始pH为5.0时,10min基本能把1L1.5mmol/L的PNP完全降解,具有最大的去除速率和去除率。PNP的最主要降解产物为对氨基苯酚。

The sulfidated nano-zero valent iron supported by bentonite,which had high specific surface area and adsorption property,was prepared.The composite material was characterized by X-ray photoelectron spectroscopy(XPS),scanning electron microscope(SEM),transmission electron microscope(TEM)and specific surface area.The effects of S/Fe molar ratio,dosage and initial pH on the removal of p-nitrophenol(PNP)were investigated.Moreover,the mechanism was discussed.Results indicated that the composite material(33.06 m^2/g)obtained even higher specific surface area than bentonite(26.72 m^2/g)and that the nanoparticles dispersed evenly.PNP removal rate and efficiency reached peak when S/Fe molar ratio was 0.011 2,dosage was 0.5 g/L and initial pH was 5.0.1 L1.5 mmol/L PNP was almost all degraded within 10 min.The most main degradation product was p-aminophenol.