| 十二烷基二甲基甜菜碱(BS-12)在合成针铁矿表面的吸附特征 |
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| 引用本文： | 吴琼,张洋,孟昭福.十二烷基二甲基甜菜碱(BS-12)在合成针铁矿表面的吸附特征[J].环境科学学报,2019,39(9):3045-3052. |
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| 作者姓名： | 吴琼 张洋 孟昭福 |
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| 作者单位： | 西北农林科技大学资源环境学院,杨凌,712100;西安市固体废弃物管理处,西安,710038;西北农林科技大学资源环境学院,杨凌712100;农业部西北植物营养与农业环境重点实验室,杨凌712100 |
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| 基金项目： | 国家自然科学基金（No.41271244） |
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| 摘 要： | 为了探究十二烷基二甲基甜菜碱(BS-12)在水合针铁矿(α-FeOOH)表面的吸附过程和机理,在不同pH值、离子强度以及温度下采用批处理法研究了针铁矿对BS-12的吸附特征;并对BS-12在针铁矿表面的吸附机制进行了探讨.研究结果表明:针铁矿对BS-12的吸附平衡时间约为8 h,吸附过程符合伪二级动力学模型,吸附速率受化学吸附机理控制.Freundlich等温吸附模型能较好地描述针铁矿对BS-12的吸附,pH值对针铁矿吸附BS-12影响显著,主要取决于针铁矿的电荷零点和BS-12的等电点;离子强度的增加对BS-12的吸附有促进作用;温度的升高促进BS-12的吸附.热力学参数结果表明,针铁矿对BS-12的吸附是一个具有熵增和焓增特征的自发性吸热过程.BS-12在针铁矿表面的吸附是一个较慢发生的吸热的化学吸附的过程,主要吸附机制为化学键作用和疏水结合模式.
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| 关 键 词： | 针铁矿 BS-12 等温吸附 热力学 |
| 收稿时间： | 2019/3/6 0:00:00 |
| 修稿时间： | 2019/6/12 0:00:00 |
Characteristics of the adsorption of dodecyl bataine (BS-12) on synthetic goethite |
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| WU Qiong,ZHANG Yang and MENG Zhaofu.Characteristics of the adsorption of dodecyl bataine (BS-12) on synthetic goethite[J].Acta Scientiae Circumstantiae,2019,39(9):3045-3052. |
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| Authors: | WU Qiong ZHANG Yang and MENG Zhaofu |
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| Institution: | College of Natural Resources and Environment, Northwest A & F University, Yangling 712100,Xi''an Solid Waste Administration, Xi''an 710038 and 1. College of Natural Resources and Environment, Northwest A & F University, Yangling 712100;2. Key Laboratory of Plant Nutrition and Agri-Environment in Northwest China, Ministry of Agriculture, Yangling 712100 |
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| Abstract: | To explore the process and the mechanism of dodecyl bataine (BS-12) adsorption on the goethite, batch experiments were carried out under different contact time, pH, ionic strengths and temperatures. The adsorption kinetics and thermodynamics were studied. The results show that the adsorption equilibrium time of BS-12 on goethite was about 8 hours. The adsorption process can be described by the Pseudo-second-order kinetic model and Freundlich equation with good correlation coefficients. The adsorption was significantly influenced by pH, depending on the pHZPC of the goethite and the isoelectric point of BS-12. The adsorption ability could be enhanced with the increase of ionic strength and the temperature. The thermodynamic parameters analysis results show that the adsorption of BS-12 on goethite was a spontaneous process characterized by entropy and enthalpy. The adsorption of BS-12 on goethite was a slow endothermic process which was regulated by chemical bonding and hydrophobic binding mode. |
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| Keywords: | goethite BS-12 isothermal adsorption thermodynamic |
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