研究报告

  • 张连科,王洋,王维大,李玉梅,孙鹏,韩剑宏,姜庆宏.磁性羟基磷灰石/生物炭复合材料的制备及对Pb2+的吸附性能[J].环境科学学报,2018,38(11):4360-4370

  • 磁性羟基磷灰石/生物炭复合材料的制备及对Pb2+的吸附性能
  • Preparation of magnetic hydroxyapatite/biochar composite and its adsorption behavior of Pb2+ and recycling performance
  • 基金项目:内蒙古自然科学基金(No.2016MS0221);包头市科技计划项目(No.2016X1021);内蒙古科技大学产学研合作培育基金项目(No.2016CXY03)
  • 作者
  • 单位
  • 张连科
  • 1. 内蒙古科技大学能源与环境学院, 包头 014010;2. 西安建筑科技大学环境与市政工程学院, 西安 710055
  • 王洋
  • 内蒙古科技大学能源与环境学院, 包头 014010
  • 王维大
  • 内蒙古科技大学能源与环境学院, 包头 014010
  • 李玉梅
  • 内蒙古科技大学能源与环境学院, 包头 014010
  • 孙鹏
  • 内蒙古科技大学能源与环境学院, 包头 014010
  • 韩剑宏
  • 内蒙古科技大学能源与环境学院, 包头 014010
  • 姜庆宏
  • 内蒙古科技大学能源与环境学院, 包头 014010
  • 摘要:制备了一种磁性羟基磷灰石/生物炭复合材料(HAP/γ-Fe2O3/BC)并对其吸附Pb2+的动力学及热力学特性和固液分离回收性能进行了研究.通过扫描电子显微镜(SEM)、X射线衍射(XRD)、傅里叶红外光谱仪(FTIR)等对复合前后的材料进行微观结构表征与分析,利用振动样品磁强计(VSM)研究样品的磁化性能.通过参数计算获得吸附方程与热力学性质.结果表明:羟基磷灰石和γ-Fe2O3微粒均负载到生物炭上.相对于BC,复合后的HAP/γ-Fe2O3/BC对Pb2+的吸附性能明显提高,并具有良好的磁分离能力.pH值对Pb2+的吸附影响较大,最佳pH值为4.0~5.0.当吸附剂投加量为1 g· L-1、pH值为5、Pb2+的初始浓度为100 mg· L-1时,HAP/γ-Fe2O3/BC对Pb2+的去除率达到99%.吸附等温方程和动力学方程的拟合结果分别符合Langmuir吸附等温模型和准二级动力学模型,热力学参数△G<0、△H>0,是自发吸热的单分子层化学吸附过程.吸附机制主要包括溶解-沉淀作用、离子交换及复合材料表面含氧官能团的络合作用.HAP/γ-Fe2O3/BC复合材料在外加磁场的作用下具有良好的分离回收和循环利用性能,是一种潜在的Pb2+高效吸附材料.
  • Abstract:A magnetic hydroxyapatite/biochar composite (HAP/γ-Fe2O3/BC) was prepared and the adsorption thermodynamic properties of Pb2+ and solid-liquid separation recovery performance were studied. The micro-structures of the samples before and after recombination were characterized and analyzed by using scanning electron microscopy (SEM), X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR). The magnetization properties of the samples were studied using a vibrating sample magnetometer (VSM). Adsorption equations and thermodynamic properties are obtained through parameter calculations. The results show that both hydroxyapatite and γ-Fe2O3 particles were loaded onto biochar. Compared to BC, the adsorption performance of HAP/γ-Fe2O3/BC for Pb2+ is obviously improved and good magnetic separation ability is obtained. pH has a great influence on the adsorption of Pb2+ and the optimum pH is 4.0~5.0. under the adsorbent dosage of 1 g·L-1, pH 5, and the initial concentration of Pb2+ at 100 mg·L-1, the adsorption of Pb2+ by HAP/γ-Fe2O3/BC reaches 99%. The fitting results of adsorption isotherm equations and kinetic equations are consistent with the Langmuir adsorption isotherm model and pseudo-second order kinetics model respectively. The thermodynamic parameters (△G<0, △H>0) indicate that the adsorption is a spontaneous endothermic monolayer chemisorption process. The adsorption mechanism mainly includes dissolution-precipitation, ion exchange, and the complexation of oxygen-containing functional groups on the surface of the composite. HAP/γ-Fe2O3/BC composite shows good separation and recycling performance under an external magnetic field, indicating the composite is an efficient adsorption material for Pb2+ removal.

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