...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Chemosphere >Silica nanoparticles separation from water: Aggregation by cetyltrimethylammonium bromide (CTAB)
【24h】

Silica nanoparticles separation from water: Aggregation by cetyltrimethylammonium bromide (CTAB)

机译：从水中分离二氧化硅纳米粒子：十六烷基三甲基溴化铵（CTAB）聚集

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

Nanoparticles will inevitably be found in industrial and domestic wastes in the near future and as a consequence soon in water resources. Due to their ultra-small size, nanoparticles may not only have new hazards for environment and human health, but also cause low separation efficiency by classical water treatments processes. Thus, it would be an important challenge to develop a specific treatment with suitable additives for recovery of nanoparticles from waters. For this propose, this paper presents aggregation of silica nanoparticles (Klebosol 30R50 (75 nm) and 30R25 (30 nm)) by cationic surfactant cetyltrimethylammonium bromide (CTAB). Different mechanisms such as charge neutralization, "depletion floccula-tion" or "volume-restriction", and "hydrophobic effect" between hydrocarbon tails of CTAB have been proposed to explicate aggregation results. One important finding is that for different volume concentrations between 0.05% and 0.51% of 30R50 suspensions, the same critical coagulation concentration was observed at CTAB = 0.1 mM, suggesting the optimized quantity of CTAB during the separation process for nanoparticles of about 75 nm. Furthermore, very small quantities of CTAB (0.01 mM) can make 30R25 nanosilica aggregated due to the "hydrophobic effect". It is then possible to minimize the sludge and allow the separation process as "greener" as possible by studying this case. It has also shown that aggregation mechanisms can be different for very small particles so that a special attention has to be paid to the treatment of nanoparticles contained in water and wastewaters.
机译：在不久的将来，不可避免地会在工业和家庭废物中发现纳米颗粒，因此很快就会在水资源中发现纳米颗粒。由于其超小尺寸，纳米颗粒不仅可能对环境和人体健康造成新的危害，而且通过传统的水处理工艺会导致分离效率低下。因此，开发一种用合适的添加剂从水中回收纳米颗粒的特殊处理方法将是一个重要的挑战。对于此提议，本文提出了通过阳离子表面活性剂十六烷基三甲基溴化铵（CTAB）聚集二氧化硅纳米颗粒（Klebosol 30R50（75 nm）和30R25（30 nm））。已经提出了不同的机制，例如电荷中和，“耗竭絮凝”或“体积限制”以及CTAB烃尾部之间的“疏水作用”，以阐明聚集结果。一个重要发现是，对于30R50悬浮液的0.05％和0.51％之间的不同体积浓度，在CTAB = 0.1 mM时观察到相同的临界凝结浓度，这表明对于约75 nm的纳米粒子，在分离过程中CTAB的最佳量。此外，由于“疏水作用”，非常少量的CTAB（0.01 mM）可使30R25纳米二氧化硅聚集。通过研究这种情况，可以将污泥降至最低，并使分离过程尽可能“绿色”。还已经表明，对于非常小的颗粒，聚集机制可能有所不同，因此必须特别注意处理水和废水中包含的纳米颗粒。

著录项

  • 来源
    《Chemosphere》 |2013年第6期|681-687|共7页
  • 作者

    Y. Liu; M. Tourbin; S. Lachaize; P. Guiraud;

  • 作者单位

    University de Toulouse, INSA UPS, INP, L1SBP, 135 Avenue de Rangueil, F-31077 Toulouse, France,INPA, UMR792 Ingenierie des Systemes Biologiques et des Precedes, F-31400 Toulouse, France,CNRS, UMR5504, F-31400 Toulouse, France;

    University de Toulouse, INSA UPS, INP, L1SBP, 135 Avenue de Rangueil, F-31077 Toulouse, France,INPA, UMR792 Ingenierie des Systemes Biologiques et des Precedes, F-31400 Toulouse, France,CNRS, UMR5504, F-31400 Toulouse, France;

    University de Toulouse, INSA, UPS, LPCNO, 135 Avenue de Rangueil, F-31077 Toulouse, France,CNRS, LPCNO, F-31077 Toulouse, France;

    University de Toulouse, INSA UPS, INP, L1SBP, 135 Avenue de Rangueil, F-31077 Toulouse, France,INPA, UMR792 Ingenierie des Systemes Biologiques et des Precedes, F-31400 Toulouse, France,CNRS, UMR5504, F-31400 Toulouse, France;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Separation; Nanoparticles; CTAB; Water; Aggregation; Silica;

    机译：分离;纳米颗粒;CTAB;水;聚合;二氧化硅;

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