| 孟昭福,张一平,王国栋,王朝峰.有机修饰改性对旱地土壤吸附镉离子特性的影响[J].干旱地区农业研究,2004,(2):1~5 |
| 有机修饰改性对旱地土壤吸附镉离子特性的影响 |
| Effects of organic modification on Cd2+ absorption characteristics in dry land soil |
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| DOI：10.7606/j.issn.1000-7601.2004.02.01 |
| 中文关键词: 有机修饰改性 土娄土耕层 BET模型 热力学参数 镉离子 |
| 英文关键词:rganic modification Lou soil BET model thermodynamic parameters, Cadmium ion |
| 基金项目:国家自然科学基金(40301021) |
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| 中文摘要: |
| 研究了以不同比例十六烷基三甲基溴化铵(CTMAB)单一修饰和十六烷基三甲基溴化铵+十二烷基磺酸钠(CTMAB+SDS)混合修饰土娄土耕层对重金属镉离子吸附的影响,结果表明:吸附量顺序为耕层原土>50%CTMAB>100%CTMAB+20%SDS>100%CTMAB,温度升高,吸附量上升;最佳吸附等温线模型可以用BET模型描述,热力学参数的研究表明,吸附自发性与吸附量具有相同的变化规律,反应的焓变与熵变共同决定了反应的自发性。从热力学角度对修饰改性土娄土对Cd2+吸附的机理进行了探讨。 |
| 英文摘要: |
| The study was carried out to discover the Cd2+ absorption characteristics in the tillage layer of Lou soils modified with cetyltrimethylammonium bromide (CTMAB) at various ratio and cetyltrimethylammonium bromide + sodium dodecylsulphonate (CTMAB+SDS) mixture. The results show that the order of absorption amount of Cd2+ is: unmodified tillage layer soil> 50%CTMAB > 100%CTMAB+20%SDS >100%CTMAB, and the absorption amount increases with the rise of temperature. The BET model is the best model which can be used to describe the Cd2+ absorption isotherm. The results of thermodynamic parameters show that the spontaneity of Cd2+ absorption in modified soil has the same variation trend as Cd2+ absorption amount and is decided by both enthalpy and entropy. The mechanism of Cd2+ absorption in modified soil is discussed with thermodynamic parameters. |
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