...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Building and Environment >Photocatalytic degradation of organic paint constituents-formation of carbonyls
【24h】

Photocatalytic degradation of organic paint constituents-formation of carbonyls

机译：有机涂料成分的光催化降解-羰基的形成

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

Titanium dioxide is frequently used in outdoor building materials to degrade, when activated by solar light, organic and inorganic pollutants in air. In this context, a promising application is the use of TiO_2 in photocatalytic paints. The development of doped TiO_2 allowing activation by visible light opens up a wide range for air purifying applications in indoor environments too. Indoors however, formation and accumulation of by-products might represent in the long term a risk for human health and affect comfort and well being. In the past, formation of low-molecular weight carbonyls as formaldehyde and acetal-dehyde was observed. The scope of this study was to identify the sources for the carbonyl compounds and propose a mechanism for their formation. A photocatalytic paint of known composition was irradiated repeatedly for a period of 14 days and carbonyl formation was measured. In addition, components of the paint were irradiated separately as single compounds in the presence/absence of titanium dioxide. Formaldehyde, acetaldehyde, propanal and acetone (in decreasing order of concentration) were the main carbonyls identified. Hexanal, heptanal and octanal were measured in lower concentrations. Formation of carbonyls decreases in the course of the irradiation. Organic polymers as paint constituents were found as the main source for the formation of the carbonyls. A mechanism based on radical chain reactions for the degradation of the organic paint matrix is proposed. The study discusses the potential risk of accumulation of carbonyls in confined spaces/indoor environments and the need to develop user friendly, low emitting photo catalytic materials.
机译：二氧化钛经常在室外建筑材料中被太阳光，空气中的有机和无机污染物激活后降解。在这种情况下，有前途的应用是在光催化涂料中使用TiO_2。允许可见光激活的掺杂TiO_2的开发也为室内环境中的空气净化应用开辟了广阔的领域。然而，在室内，从长远来看，副产物的形成和积累可能代表着人类健康的风险，并影响舒适度和健康。过去，观察到形成低分子量羰基化合物如甲醛和乙缩醛。本研究的范围是确定羰基化合物的来源并提出其形成机理。重复照射已知组成的光催化涂料14天，并测量羰基的形成。另外，在存在/不存在二氧化钛的情况下，以单一化合物的形式分别照射涂料的成分。甲醛，乙醛，丙醛和丙酮（按浓度降序排列）是主要的羰基化合物。己醛，庚醛和辛烷的浓度较低。羰基的形成在辐射过程中减少。发现作为涂料成分的有机聚合物是形成羰基的主要来源。提出了一种基于自由基链反应的有机涂料基体降解机理。该研究讨论了在密闭空间/室内环境中羰基积累的潜在风险，以及对开发用户友好的低发射光催化材料的需求。

著录项

  • 来源
    《Building and Environment》 |2012年第2期|p.107-112|共6页
  • 作者

    Otmar Geiss; Carmen Cacho; Josefa Barrero-Moreno; Dimitrios Kotzias;

  • 作者单位

    European Commission, Joint Research Centre. Institute for Health and Consumer Protection, Via E.Fermi 2749, 21027 Ispra (VA), Italy;

    European Commission, Joint Research Centre. Institute for Health and Consumer Protection, Via E.Fermi 2749, 21027 Ispra (VA), Italy;

    European Commission, Joint Research Centre. Institute for Health and Consumer Protection, Via E.Fermi 2749, 21027 Ispra (VA), Italy;

    European Commission, Joint Research Centre. Institute for Health and Consumer Protection, Via E.Fermi 2749, 21027 Ispra (VA), Italy;

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

    photocatalysis; TiO_2; by-products; paint; carbonyls; formaldehyde;

    机译：光催化TiO_2;副产品;涂料;羰基;甲醛;

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