介孔分子筛MCM-41的制备及其对Cr^(6+)的吸附

Preparation of mesoporous molecular sieve MCM-41 and its adsorption behabior for chromium ion in water

以鞍山铁尾矿为硅源,CTAB为模板剂,采用水热法合成出介孔分子筛MCM-41。采用XRD、BET、HRTEM对样品进行了表征。将该介孔分子筛MCM-41应用于水中Cr6+离子的吸附,研究了吸附时间、吸附剂用量、初始浓度对分子筛吸附性能的影响,并探讨了吸附过程的表观吸附动力学模型及吸附等温模型。结果表明,增加吸附时间、吸附剂用量、初始浓度有利于分子筛对Cr6+离子的吸附。Cr6+的吸附过程遵循二级表观吸附动力学模型;在吸附剂表面的吸附遵循Langmuir吸附等温线模型。

Using the iron ore tailings as the silica source and n-hexadecyltrimethyl ammonium bromide （CTAB） as the template, mesoporous molecular sieves MCM-41 was successfully synthesized by hydrothermal synthesis. The sample was characterized by XRD, BET and HRTEM. The effects of adsorption conditions on the adsorption efficiency for Cr^6＋ by the MCM-41 absorbents were systemically studied. The adsorption isothern model and adsorption kinetics model were also explored. With these parameters increasing, such as the adsor bent time, adsorbent dose, and initial concentration, the efficiencies of Cr^6＋ were also increased. The adsorp- tion kinetics of MCM-41 absorbents for the Cr^6＋ was corresponded to the modified pseudo-second-order equations, and the absorption isotherms was all satisfied to the Langmuir models.