...
首页> 外文期刊>Environmental Science & Technology >Removal of Ammonia from Air on Molybdenum and Tungsten Oxide Modified Activated Carbons
【24h】

Removal of Ammonia from Air on Molybdenum and Tungsten Oxide Modified Activated Carbons

机译:从空气中去除钼和氧化钨改性活性炭上的氨

获取原文
获取原文并翻译 | 示例
           

摘要

Microporous coconut-based activated carbon was impregnated with solutions of ammonium metatungstate or ammonium molybdate and then calcined in air in order to convert the salts into their corresponding oxides. The surface of those materials was characterized using adsorption of nitrogen, potentiometric titration, Fourier-transform infrared spectroscopy, X-ray diffraction, and thermal analysis. The results indicated a significant increase in surface acidity related to the presence of tungsten or molybdenum oxides. On the materials obtained, adsorption of ammonia from either dry or moist air was carried out. The oxides distributed on the surface provided Lewis and/or Bransted centers for interactions with ammonia molecules or ammonium ions. Water on the surface of carbon or in the gas phase increased the amount of ammonia adsorbed via involvement of Bransted-type interactions and/or by leading to the formation of molybdate or tungstate salts on the surface. Although the amount of ammonia adsorbed is closely related to the number of moles of oxides and their acidic centers, the carbon surface also contributes to the adsorption via providing small pores where ammonia can be dissolved in the water film.
机译:将微孔椰子基活性炭用偏钨酸铵或钼酸铵溶液浸渍,然后在空气中煅烧,以将盐转化为相应的氧化物。这些材料的表面通过氮气吸附,电位滴定,傅立叶变换红外光谱,X射线衍射和热分析来表征。结果表明与钨或钼氧化物的存在有关的表面酸度显着增加。在获得的材料上,从干燥或潮湿的空气中吸附氨。分布在表面上的氧化物为路易斯和/或布朗斯台德中心提供了与氨分子或铵离子相互作用的能力。碳表面或气相上的水通过参与布朗斯台德型相互作用和/或导致表面上形成钼酸盐或钨酸盐而增加了氨的吸附量。尽管氨的吸附量与氧化物的摩尔数及其酸性中心密切相关,但碳表面还通过提供小孔(氨可溶于水膜中)而有助于吸附。

著录项

  • 来源
    《Environmental Science & Technology》 |2008年第8期|p.3033-3039|共7页
  • 作者单位

    Department of Chemistry, The City College of New York and The Graduate School of the City University of New York, 160 Convent Ave, New York, New York 10031;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 环境化学;
  • 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