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| 水滑石的沉淀结晶制备及其对树脂的吸附动力学研究 |
| Preparation of Hydrotalcite by Precipitation-crystallization Process and the Adsorption Kinetics of Resin on the Hydrotalcite |
| 收稿日期： |
| DOI：10.11980/j.issn.0254-508X.2012.07.003 |
| 关键词: 水滑石 焙烧水滑石 沉淀结晶 树脂 吸附 |
| Key Words:hydrotalcite calcined hydrotalcite precipitation and crystallization resin adsorption |
| 基金项目:国家自然科学基金面上项目（31070529）。 |
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| 摘要点击次数: 5783 |
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| 摘要:采用沉淀结晶法合成了镁铝水滑石，使用聚焦光束反射测量仪（FBRM）在线实时监测了其沉淀结晶过程，利用高分辨率透射电镜（HRTEM）对合成的样品进行了表征,同时以松香酸为模型物，研究了水滑石对树脂的吸附动力学曲线，根据吸附动力学模型解释了水滑石对树脂的吸附机理。结果表明，二次成核是水滑石结晶的主要过程，6 h的老化时间即可获得较高的结晶度。HRTEM证实了该方法合成的水滑石结晶状况良好且具有典型的层片状结构，焙烧后层状结构消失，形成无定形和多孔结构，增加了单位比表面积，吸附效果更好。焙烧水滑石对于松香酸的吸附过程主要为化学吸附，准二级动力学方程能较好地描述整个吸附过程。 |
| Abstract:The hydrotalcite was synthesised by precipitation-crystallization process, the process of precipitation and crystallization was monitored on situ by using focused beam reflectance measurement (FBRM). The high-resolution transmission electron microscope (HRTEM) was used to characterize the micromorphology of the samples, and the adsorption mechanism of resin on hydrotalcite was suggested according to adsorption kinetics models, aiming to provide the scientific basis for developing the novel pitch control agent. The results showed that secondary nucleation is the main process of crystallization, and 6 h aging time could obtain hydrotalcite with a high degree of crystallinity. The prepared hydrotalcite had well-defined thin platelet morphology. After calcinations the platelet structure of the hydrotalcite disappeared, which was confirmed by high-resolution transmission electron microscopy. The process of resin adsorbed on calcined hydrotalcite was mainly chemical adsorption, and the adsorption kinetics accorded with the pseudo second order kinetic equation. |
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