| 李文斌,杨淑英,孟昭福,崔晓波,刘伟,白丹.DTAB对两性膨润土的复配修饰机制和吸附菲的影响[J].农业环境科学学报,2015,34(9):1722-1729. |
| DTAB对两性膨润土的复配修饰机制和吸附菲的影响 |
| Secondary Modification Mechanisms of BS-12 Modified Bentonite with DTAB and Phenanthrene Adsorption by Combinedly Modified Bentonite |
| 投稿时间：2015-04-01 |
| DOI：10.11654/jaes.2015.09.014 |
| 中文关键词: 复配修饰 离子交换 疏水结合 吸附能力 |
| 英文关键词: combined modification ion exchange hydrophobic bonding adsorption |
| 基金项目:国家自然科学基金(41271244);陕西省社会发展攻关项目(2013K13-01-05);陕西省农业科技攻关项目(2012K02-15) |
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| 中文摘要: |
| 复配修饰后的黏土对污染物具有卓越的吸附功能,为了探究阳离子型修饰剂对两性修饰土的复配修饰机制,并考察其对两性修饰土吸附有机污染物的影响,采用阳离子型表面修饰剂十二烷基三甲基溴化铵(DTAB)对两性表面修饰剂十二烷基二甲基甜菜碱(BS-12)修饰膨润土进行复配修饰,通过“SDC”曲线变化和模型拟合结果判断复配修饰在土样表面的离子交换和疏水结合模式的变化,并验证了阳离子+两性复配修饰土样对菲的吸附效果。结果表明:DTAB对25%、50%和100%BS-12修饰土复配修饰存在离子交换和疏水结合两种模式,且分别在DTAB修饰比例31.15%、17.26%和2.40% CEC时开始出现疏水结合模式;单一BS-12修饰土对菲的吸附能力随BS-12修饰比例的增加而增强,25%BS-12+DTAB和50%BS-12+DTAB复配修饰土对菲的吸附能力均随DTAB修饰比例的增加而增加,而100%BS-12+DTAB复配修饰土对菲的吸附能力在不同DTAB复配修饰比例下差异较小;随着离子强度的增加,原土与BS-12修饰土对菲的吸附量显著增加,且0.1 mol·L-1条件下最佳,而BS-12+DTAB复配修饰土无显著变化;DTAB+BS-12复配修饰土对菲的吸附能力与BS-12和DTAB的复配修饰比例以及菲的饱和吸附有关。 |
| 英文摘要: |
| Combinedly modified clays have enhanced adsorption of pollutants. In the present study, we investigated combined modification mechanisms of BS-12 modified amphoteric bentonite using DTAB, and examined the phenanthrene adsorption by combinedly modified clays. Ion exchange and hydrophobic bonding mode were determined by the changes in "SDC" curves and the model fitting results. Results showed that ion exchange and hydrophobic bonds coexisted in combined modification of BS-12-bentonite with DTAB. Hydrophobic bonding began to appear at DTAB rate of 31.15%, 17.26% and 2.40% CEC for 25%, 50%, and 100% BS-12 bentonite, respectively. Phenanthrene adsorption increased with increasing modification ratios for single modified(BS-12) and combined modified clays(25% BS-12+DTAB and 50%BS-12+DTAB). However, the adsorption by 100% BS-12+DTAB showed little difference. Adsorption of phenanthrene by original and BS-12 modified bentonite was profoundly influenced by ionic strength, with the maximum observed at 0.1 mol·L-1, whereas no difference in phenanthrene adsorption was found on BS-12 and DTAB combinedly modified bentonite. The adsorption of phenanthrene on combinedly modified clays was dependent on the ratios of both BS-12 and DTAB, and the saturated adsorption of phenanthrene on clay surface. |
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