| 蒙脱石对赖氨酸和壳聚糖的吸附实验研究 |
| |
| 引用本文： | 徐敏,盛玲,季峻峰,蔡进功.蒙脱石对赖氨酸和壳聚糖的吸附实验研究[J].高校地质学报,2014,20(4):537. |
| |
| 作者姓名： | 徐敏 盛玲 季峻峰 蔡进功 |
| |
| 作者单位： | 1. 表生地球化学教育部重点实验室
2. 南京大学地球科学与工程学院,南京,210023 |
| |
| 基金项目： | 国家自然科学基金(41072089)；国家油气重大专项(2011ZX05006-001)；中国石油化工有限公司科技局基金 |
| |
| 摘 要： | 粘土矿物对有机质的吸附是自然界重要的过程之一。科学界对于有机质与粘土矿物的相互作用过程和机制研究仍处
于一个比较薄弱的阶段。该文采用天然有机质赖氨酸（左旋） 和壳聚糖与蒙脱石进行室内合成模拟实验，通过X射线衍
射、化学分析和红外光谱分析的手段对反应产物进行系统研究。结果表明，蒙脱石对赖氨酸和壳聚糖的吸附均存在两种机
制：阳离子交换和有机分子间的相互吸引。赖氨酸在蒙脱石层间的排布有三种构型，随着赖氨酸浓度的增加分别以倾斜
式、垂直呈“之”字形排列，最后形成第二排并可能生成简单肽；氨基酸的净电荷是影响吸附过程的重要因素,主要与pH
值相关。壳聚糖能在蒙脱石层间形成分层结构，溶液的pH值和无机盐的存在都会影响吸附过程。壳聚糖-蒙脱石复合体在
常温常压下水溶液中能稳定存在，而相同条件下赖氨酸易从蒙脱石层间释放，这主要是由有机质本身的性质以及有机质和
蒙脱石的结合方式决定的。
|
| 关 键 词： | 蒙脱石 赖氨酸 壳聚糖 吸附 稳定性 |
The Study of Adsorption of L-lysine and Chitosan on Montmorillonite |
| |
| XU Min,SHENG Lin,JI Junfeng,CAI Jingong.The Study of Adsorption of L-lysine and Chitosan on Montmorillonite[J].Geological Journal of China Universities,2014,20(4):537. |
| |
| Authors: | XU Min SHENG Lin JI Junfeng CAI Jingong |
| |
| Abstract: | Organic matter adsorbed onto the surface of clay minerals is one of an important process in the natural environment.
However, the process and mechanism of the interaction between natural organic matter and clay minerals is highly debated due to its
complexity. To solve this problem, natural organic matter of L-lysine and chitosan are intercalated in montmorillonite. Chemical
analysis, infrared spectroscopy and X-ray diffraction have been employed in the characterization of the reaction products. Our data
indicated that the adsorption of the L-lysine and chitosan is both firstly dominated by cation exchange and secondly by adsorption of
electrically neutral forms. For L-lysine, three configurations seem to form. At low concentrations, L-lysine is inclined in the interlayer.
As the concentration of L-lysine increases, the molecules orientate perpendicular to the montmorillonitelayers, maybe in a zig-zag
arrangement. When the concentration is higher enough, the second row of L-lysine appears and peptides may formed in the interlayer
by L-lysine polymerisation. The net charge of amino acids, which depends on the pH value in both the bulk solution and in the
proximity of the clay layer or the interlayer space, is an important factor affecting the adsorption process. For chitosan, a layered
structure can form in the interlayer of montmorillonite. The pH value of the solution and the presence of the inorganic salt will affect the
adsorption process. Chitosan-montmor illonite complexes in aqueous solution at room temperature and atmospheric pressure is stable,
but under the same condition, L-lysine is easily released from the interlayer space of montmorillonite, which is related to the nature of
the organic matter itself and its form combined with montmorillonite. |
| |
| Keywords: | montmorillonite L-lysine chitosan adsorption stability |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
| 点击此处可从《高校地质学报》浏览原始摘要信息 |
|
点击此处可从《高校地质学报》下载全文 |
|
