摘要
利用化学共沉淀法制备了磁性凹土复合吸附剂(ATP/Fe_3O_4),通过静态吸附实验研究了该材料对水中Pb^(2+)的吸附性能。采用扫描电子显微镜(SEM)、X射线衍射仪(XRD)、红外光谱仪(FTIR)和振动样品磁强计(VSM)对复合吸附剂进行表征,并考察了吸附剂投加量、溶液初始pH值及吸附时间等因素对Pb^(2+)吸附效果的影响。结果表明,Fe_3O_4颗粒负载在凹土表面,复合吸附剂的比饱和磁化强度为29.22 emu/g,可有效实现固液分离的目标。Pb^(2+)吸附实验表明,ATP/Fe_3O_4对Pb^(2+)具有良好的吸附效果,当Pb^(2+)初始浓度为50mg/L、溶液pH为5.0、吸附剂用量为3.0 g/L时,去除率可达87.35%。ATP/Fe_3O_4对Pb^(2+)的吸附行为符合准二级动力学方程。
A batch system was used to evaluate the adsorption properties of Pb2_ onto a magnetic attapulgite composite, which was prepared by chemical coprecipitation method.The composite adsorbent was characterized by scanning electron microscope （ SEM）, X-ray diffraction （ XRD）, Fourier transform infrared spectroscopy （ FTIR） and vibrating sample magnetometer （ VSM）, and the adsorbent dosage, initial pH value and adsorption time on the adsorption efficiency of Pb2_in aqueous solution were investigated. The results show that Fe3〇 4 particles are loaded on the attapulgite surface, and the specific saturation magnetization of the composite adsorbent reaches 29.22 emu/ g, which could be separated efficiently from solution by magnetic separation. In addition, the sorbent has favorable adsorption ability for Pb2_ and the removal rate achieves 87.35% when the initial concentration of Pb2 is 50 mg/ L, the solution pH is 5 and the adsorbent dosage is 3g/L at 25° C. The adsorption kinetics follows the mechanism of the pseudo-second-order kinetic model.
出处
《环境研究与监测》
2017年第4期1-5,共5页
Environmental Research and Monitoring
基金
淮阴工学院自然科学基金项目(16HGZ001)
淮阴工学院大学生创新创业训练项目(Z205C16224)
