• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文OA文献 >Montmorillonite-chitosan bionanocomposites as adsorbents of the herbicide clopyralid in aqueous solution and soil/water suspensions
【2h】

Montmorillonite-chitosan bionanocomposites as adsorbents of the herbicide clopyralid in aqueous solution and soil/water suspensions

机译：蒙脱土-壳聚糖生物纳米复合物作为除草剂氯吡菌醛在水溶液和土壤/水悬浮液中的吸附剂

代理获取
本网站仅为用户提供外文OA文献查询和代理获取服务，本网站没有原文。下单后我们将采用程序或人工为您竭诚获取高质量的原文，但由于OA文献来源多样且变更频繁，仍可能出现获取不到、文献不完整或与标题不符等情况，如果获取不到我们将提供退款服务。请知悉。
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Montmorillonite (SWy-2)-chitosan bionanocomposites (SW-CH) were prepared following different methodologies, characterized, and assayed as adsorbents of the herbicide clopyralid (3,6-dichloropyridine-2-carboxylic acid) in aqueous solution and soil/water suspensions, to assess the potential of the materials to prevent and remediate soil and water contamination by anionic pesticides. The SW-CH bionanocomposites were good adsorbents for the herbicide at pH levels where both the anionic form of the herbicide (pK a=2.3) and the cationic form of CH (pK a=6.3) predominated. The performance of the SW-CH bionanocomposites as adsorbents of clopyralid depended on the amount and arrangement of chitosan in the samples. Clopyralid adsorption was rapid and mostly linear up to herbicide concentrations as high as 0.5mM. High salt concentrations (0.1M NaCl) promoted desorption of the adsorbed pesticide from SW-CH, strongly suggesting that adsorption of clopyralid occurred primarily through an ion exchange mechanism on positively charged CH sites at the montmorillonite surface. Amendment of an acidic soil (pH=4.5) with SW-CH at rates of 5% and 10% led to a significant increase in clopyralid adsorption, whereas this effect was negligible when SW-CH was added to an alkaline soil (pH=8.0), reflecting the absence of positively charged sites in SW-CH at high pH values. Montmorillonite-CH bionanocomposites can be useful as adsorbents for the removal and/or immobilization of anionic pesticides in soil and water under mild acidic conditions.
机译：蒙脱石（SWy-2）-壳聚糖生物纳米复合材料（SW-CH）是按照不同的方法制备，表征并测定的，作为水溶液和土壤/水混悬液中除草剂氯吡格雷（3,6-二氯吡啶-2-羧酸）的吸附剂评估材料预防和修复阴离子农药对土壤和水污染的潜力。在除草剂的阴离子形式（pK a = 2.3）和CH的阳离子形式（pK a = 6.3）都占主导的pH值水平下，SW-CH离子纳米复合材料是除草剂的良好吸附剂。 SW-CH仿生复合物作为氯吡格雷吸附剂的性能取决于样品中壳聚糖的数量和排列方式。吡虫啉吸附迅速，在除草剂浓度高达0.5mM时呈线性关系。高盐浓度（0.1M NaCl）促进了吸附的农药从SW-CH的解吸，强烈表明氯吡格雷的吸附主要通过离子交换机制发生在蒙脱石表面带正电的CH部位上。用SW-CH分别以5％和10％的比例修饰酸性土壤（pH = 4.5）导致氯吡格雷吸附显着增加，而将SW-CH添加到碱性土壤（pH = 8.0）时，这种影响可忽略不计），反映出在高pH值下SW-CH中没有带正电的位点。蒙脱土-CH离子纳米复合材料可用作吸附剂，用于在弱酸性条件下去除和/或固定土壤和水中的阴离子农药。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
代理获取

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