• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>RSC Advances >Low temperature synthesis and characterization of substitutional Na-modified K2Ti6O13 nanobelts with improved photocatalytic activity under UV irradiation
【24h】

Low temperature synthesis and characterization of substitutional Na-modified K2Ti6O13 nanobelts with improved photocatalytic activity under UV irradiation

机译：紫外线照射下具有改进的光催化活性的低温合成与取代性Na-改性K2Ti6O13纳米核的表征

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

The substitutional Na-modified K2Ti6O13 (NKTO) nanobelts were synthesized by a facile one-step method from NaCl-KCl melts at a relatively low temperature below 700 degrees C. The obtained samples were fully characterized by X-ray diffraction (XRD), energy dispersive spectrometer (EDS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), selected area electron diffraction (SAED), thermogravimetry and differential scanning calorimetry (TG-DSC), N-2 adsorption-desorption analysis, UV-Vis diffuse reflectance spectroscopy and photoluminescence (PL) spectroscopy. The results revealed the highly crystalline NKTO nanobelts obtained above 680 degrees C exhibited not only a narrow distribution of particle size but good dispersivity. The replacement of K+ by Na+ ions reduced the interplanar spacing of K2Ti6O13 but did not destroy its oriented growth along [010]. From these results, the formation mechanism of the NKTO nanobelts was proposed. The specific surface area of the nanobelts showed a decrease with the increase of the synthetic temperature. Different titania phases were found to have a significant effect on the formation of NKTO nanobelts and rutile was the optimum titanium precursor. Substitutional Na-modification was demonstrated to not only red-shift the absorption edge and increase UV absorption but also to efficiently suppress the recombination of photogenerated electron-hole pairs. The photocatalytic tests showed the substitutional Na modification and lower synthetic temperature greatly promoted the activity for photodegradation of methyl orange under UV irradiation and the improved photocatalytic mechanism was also discussed.
机译：通过从NaCl-kCl熔体在低于700℃的相对低温下的熔体合成取代的Na-修饰的K2Ti6O13（NKTO）纳米胶。所得样品通过X射线衍射（XRD），能量完全表征。色散光谱仪（EDS），扫描电子显微镜（SEM），透射电子显微镜（TEM），高分辨率透射电子显微镜（HRTEM），选择的区域电子衍射（SAED），热重率和差示扫描量热法（TG-DSC），n -2吸附 - 解吸分析，UV-Vis弥射反射光谱和光致发光（PL）光谱。结果显示出高于680℃的高度结晶NKTO纳米核，不仅表现出颗粒尺寸的窄分布，而是良好的分散性。通过Na +离子替换K +降低了K2Ti6O13的白板间距，但没有破坏其沿[010]的定向生长。从这些结果来看，提出了NKTO纳米座的形成机制。纳米座的比表面积随着合成温度的增加而降低。发现不同的二氧化钛相对NKTO纳米螺母的形成具有显着影响，并且金红石是最佳的钛前体。证明了不仅对吸收边缘的红移并增加了紫外线吸收，而且还可以有效地抑制光发性的电子孔对的重组。光催化试验表明，取代Na改性，较低的合成温度大大促进了紫外线照射下甲基橙光降解的活性，并讨论了改善的光催化机理。

著录项

  • 来源
    《RSC Advances》 |2015年第81期|共10页
  • 作者

    Wang Qiang; Guo Qingjun; Li Bing;

  • 作者单位

    E China Univ Sci &

    Technol Sch Mech &

    Power Engn Shanghai 200237 Peoples R China;

    E China Univ Sci &

    Technol Sch Mech &

    Power Engn Shanghai 200237 Peoples R China;

    E China Univ Sci &

    Technol Sch Mech &

    Power Engn Shanghai 200237 Peoples R China;

  • 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