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本文合成了一种新型二氧化钛/石墨烯(TiO2-Gr)复合材料吸附剂,研究了其对水溶液中Pd(II)的吸附作用,并与TiO2的吸附性能进行了比较。制得的TiO2-Gr吸附剂分别进行了透射电子显微镜(TEM)表征及X射线衍射(XRD)分析,考察了吸附过程中时间、溶液p H、吸附剂用量、离子强度、Pd(II)浓度和温度等参数对吸附量的影响。研究了吸附过程中动力学、热力学及吸附等温线。结果表明吸附过程符合假二级动力学模型,吸附等温线符合Langmuir和Freundlich等温吸附方程。对热力学函数(吉布斯函数变、焓变、熵变)测定表明,本文合成的TiO2-Gr吸附剂对Pd(II)的吸附属于自发吸热反应。
In this paper, a new TiO2 / Gr composite adsorbent was synthesized and its adsorption on Pd (II) in aqueous solution was studied and compared with that of TiO2. The prepared TiO2-Gr adsorbents were characterized by transmission electron microscopy (TEM) and X-ray diffraction (XRD), respectively. The effects of time, solution pH, adsorbent dosage, ionic strength, Pd (II) And temperature parameters on the adsorption capacity. The kinetics, thermodynamics and adsorption isotherms were studied during the adsorption process. The results show that the adsorption process conforms to the pseudo second-order kinetic model, and the adsorption isotherms fit the Langmuir and Freundlich isothermal adsorption equations. The determination of thermodynamic function (Gibbs function change, enthalpy change, entropy change) shows that the adsorption of Pd (II) on TiO2-Gr adsorbent synthesized in this paper belongs to the spontaneous endothermic reaction.