...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Environmental Engineering Science >Cyclodextrin-Enhanced Extraction and Removal of 2,4-Dinitrotoluene from Contaminated Soils
【24h】

Cyclodextrin-Enhanced Extraction and Removal of 2,4-Dinitrotoluene from Contaminated Soils

机译：从污染土壤中增强环糊精的萃取和去除2,4-二硝基甲苯

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The extraction and removal of 2,4-dinitrotoluene (2,4-DNT) from contaminated soils were evaluated using aqueous solutions of hydroxypropyl-β-cyclodextrin (HPCD). The cyclodextrin-enhanced removal of 2,4-DNT from soils was investigated as function of soil type and concentration of HPCD solutions up to 5% HPCD (w/w). Three soils were spiked with 480 mg of 2,4-DNT per kg of soil: kaolin, a low-buffering clayey soil; montmorillonite, a soil with high specific surface area; and glacial till, a high-buffering silty soil with organic matter. The glacial till was a field soil containing 2.8% organic matter. The solubility of 2,4-DNT in 5% HPCD solution increased approximately threefold compared to solubility of 2,4-DNT in water. For kaolin, water was as effective as HPCD solutions. For montmorillonite, the 5% HPCD solution was the most effective extractant. For glacial till, the 2% HPCD solution was as effective an extractant as the 5% HPCD solution. Although the solubility of 2,4-DNT in 2% HPCD was enhanced approximately 1.7-fold, the extraction of 2,4-DNT from glacial till and montmorillonite using 2% HPCD was enhanced more than twofold in sequential extractions. Three-stage sequential extractions with 2% HPCD followed by two water rinse stages resulted in the removal of 75 and 64% of 2,4-DNT from the glacial till and montmorillonite soils, respectively, whereas five-stage sequential extractions with water alone removed 33 and 30% of 2,4-DNT from glacial till and montmorillonite, respectively. The sequential extraction results showed that the 2% HPCD solution was an effective extractant for remediation of soils with strong retention of 2,4-DNT.
机译：使用羟丙基-β-环糊精（HPCD）水溶液评估了从污染土壤中2,4-二硝基甲苯（2,4-DNT）的提取和去除。研究了环糊精对土壤中2,4-DNT的去除与土壤类型和HPCD溶液浓度（最高5％HPCD（w / w））的关系。每公斤土壤中掺入480 mg 2,4-DNT的三种土壤：高岭土，一种低缓冲性粘土质土壤；蒙脱土，一种具有高比表面积的土壤；冰川耕层，高缓冲的粉质土壤，富含有机物。冰川耕地是含有2.8％有机物的田间土壤。与2,4-DNT在水中的溶解度相比，2,4-DNT在5％HPCD溶液中的溶解度增加了大约三倍。对于高岭土，水与HPCD溶液一样有效。对于蒙脱石，5％HPCD溶液是最有效的萃取剂。对于冰川消融，2％的HPCD溶液与5％的HPCD溶液一样有效。尽管将2，4-DNT在2％HPCD中的溶解度提高了约1.7倍，但在连续萃取中，使用2％HPCD从冰川和蒙脱石中提取2,4-DNT的效果提高了两倍以上。用2％HPCD进行三阶段连续萃取，然后进行两个水冲洗阶段，分别从冰川土和蒙脱土中去除了75％和64％的2,4-DNT，而仅用水去除了五阶段连续萃取分别有33％和30％的2,4-DNT来自冰川土层和蒙脱石。连续萃取结果表明，2％的HPCD溶液是一种有效的土壤修复剂，具有强的2,4-DNT保留能力。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号