• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>RSC Advances >Surface-functionalized silica aerogels and alcogels for methylene blue adsorption
【24h】

Surface-functionalized silica aerogels and alcogels for methylene blue adsorption

机译：表面官能化的二氧化硅气凝胶和阿尔科凝胶用于亚甲基蓝色吸附

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

Surface-functionalized silica aerogels and alcogels prepared via a two-step sol-gel process through the combination of different silicon precursors were used in the adsorption of methylene blue dye molecules from aqueous media. The effect on the adsorption in batch reactors of the nature of precursors, the solvent used in the adsorbents synthesis, and the pH of the dye solution was monitored. Phenyl-functionalized silica materials revealed the highest adsorption capacity. Two phenyl-modified silica aerogels were widely tested in adsorption under various experimental conditions where the effect of pH, temperature, contact time, initial dye concentration, and adsorbent dose were investigated. The synthesis solvent was found to have a clear effect on the behavior of the adsorbent. Optimal conditions were found at pH 8 and 9 where the adsorbent-adsorbate surface charge interactions and the p-p stacking are most favourable. The adsorption followed a pseudo-second order kinetics, indicative of a co-existing chemisorption and physisorption processes. The adsorption data fitted the Sips isotherm and exhibited for the best aerogel a maximum adsorption capacity of 49.2 mg of dye per gram of adsorbent. The thermodynamic study revealed the adsorption of methylene blue onto phenyl-functionalized silica aerogels to be an exothermic and ordered adsorption process.
机译：使用不同硅前体的两步溶胶制备的表面官能化的二氧化硅气凝胶和通过不同硅前体的组合制备的亚甲基蓝染料分子从含水介质吸附。对前体性质的分批反应器中吸附的影响，对吸附剂合成中使用的溶剂，以及染料溶液的pH。苯基官能化的二氧化硅材料显示出最高的吸附能力。在研究PH，温度，接触时间，初始染料浓度和吸附剂量的各种实验条件下，在吸附中在吸附中广泛测试了两种苯基改性二氧化硅气凝胶。发现合成溶剂对吸附剂的行为有明显的影响。在pH 8和9处发现最佳条件，其中吸附剂吸附表面电荷相互作用和P-P堆叠最有利。吸附遵循伪二阶动力学，指示共存的化学吸附和理由过程。吸附数据适用于啜饮等温线，并为最佳的气凝胶显示出每克吸附剂49.2mg染料的最大吸附容量。热力学研究表明将亚甲基蓝的吸附到苯基官能化的二氧化硅气凝胶中，是放热和有序的吸附过程。

著录项

  • 来源
    《RSC Advances》 |2015年第8期|共12页
  • 作者

    Saad Naim; Al-Mawla Mazen; Moubarak Elias; Al-Ghoul Mazen; El-Rassy Houssam;

  • 作者单位

    Amer Univ Beirut Dept Chem Beirut 11072020 Lebanon;

    Amer Univ Beirut Dept Chem Beirut 11072020 Lebanon;

    Amer Univ Beirut Dept Chem Beirut 11072020 Lebanon;

    Amer Univ Beirut Dept Chem Beirut 11072020 Lebanon;

    Amer Univ Beirut Dept Chem Beirut 11072020 Lebanon;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
  • 关键词

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