• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>RSC Advances >Multi-shelled ZnO decorated with nitrogen and phosphorus co-doped carbon quantum dots: synthesis and enhanced photodegradation activity of methylene blue in aqueous solutions
【24h】

Multi-shelled ZnO decorated with nitrogen and phosphorus co-doped carbon quantum dots: synthesis and enhanced photodegradation activity of methylene blue in aqueous solutions

机译：用氮和磷共掺杂碳量子点装饰多壳ZnO：合成和增强水溶液中亚甲基蓝光降解活性

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 presence of organic dyes in wastewater has posed a huge threat to aquatic life and human health. In this study, nitrogen and phosphorus co-doped carbon quantum dot (CQD)-decorated multi-shelled ZnO microsphere photocatalysts (NPCQD/ZnO) were obtained via a simple absorption process; ZnO was prepared by calcining carbon microspheres as the sacrificial template. The as-prepared NPCQD/ZnO showed an obvious multi-shelled structure with the nitrogen and phosphorus co-doped CQDs homogeneously attached onto the inner and outer shells of ZnO. According to the UV-Vis DRS results, all the co-doped, single-doped and undoped carbon quantum dots could enhance the efficiency of absorption of visible light and reduce the optical band gap. Furthermore, the PL characterization results showed that the NPCQD/ZnO composites had lowest fluorescence intensity because the decoration of ZnO with NPCQDs could effectively reduce the recombination rate of photogenerated electron-hole pairs in the ZnO semiconductor photocatalyst. Importantly, 2 g-NPCQD/ZnO composites exhibited higher photodegradation performance towards methylene blue (MB) than pure ZnO and even the newly reported series of ZnO catalysts under the same conditions. Moreover, the degradation obeyed the pseudo-first-order and Langmuir-Hinshelwood kinetics models with a reaction constant of 0.0725 min(-1), which was 1.05 times that of pure ZnO (0.0353 min(-1)). The NPCQD/ZnO composites not only showed good photocatalytic performance, but also had excellent stability since the photocatalytic activity did not significantly decrease after five cycling tests. In addition, compared with single-doped and undoped carbon quantum dots, N and P co-doped carbon quantum dots have more significant efficiency for the modification of semiconductor photocatalysts. The present study shows that the CQD-decorated multi-shelled ZnO can be regarded as an excellent photocatalyst candidate in the field of water treatment. Moreover, this new concept is helpful in the controllable construction of other multi-shelled metal oxides decorated with co-doped carbon quantum dots with enhanced photocatalytic properties.
机译：废水中有机染料的存在对水生生命和人类健康构成了巨大的威胁。在该研究中，通过简单的吸收过程获得氮和磷共掺杂碳量子点（CQD） - 掺杂的多壳ZnO微球光催化剂（NPCQD / ZnO）;通过将碳微球作为牺牲模板煅烧来制备ZnO。制备的NPCQD / ZnO显示出明显的多壳结构，其具有均匀地附着在ZnO的内壳和外壳上的氮和磷共掺杂CQD。根据UV-VIS DRS结果，所有共掺杂，单掺杂和未掺杂的碳量子点可以增强可见光的吸收效率，并减小光带间隙。此外，PL表征结果表明，NPCQD / ZnO复合材料具有最低的荧光强度，因为ZnO与NPCQD的装饰可以有效地降低ZnO半导体光催化剂中光发生的电子空穴对的复合速率。重要的是，2G-NPCQD / ZnO复合材料表现出比纯ZnO的亚甲基蓝（MB）更高的光降解性能，并且甚至在相同条件下新报道的一系列ZnO催化剂。此外，降解遵循伪第一阶和朗米尔 - 欣斯伍德动力学模型，反应常数为0.0725分钟（-1），其纯ZnO（0.0353min（-1））的1.05倍。 NPCQD / ZnO复合材料不仅显示出良好的光催化性能，而且由于在五次循环试验后光催化活性没有显着降低，因此具有优异的稳定性。另外，与单掺杂和未掺杂的碳量子点相比，n和p共掺杂的碳量子点对半导体光催化剂的改变具有更显着的效率。本研究表明，CQD装饰的多壳ZnO可以被认为是水处理领域的优异光催化剂候选者。此外，这种新概念有助于用具有增强的光催化性能的共掺杂碳量子点装饰的其他多壳金属氧化物的可控结构。

著录项

  • 来源
    《RSC Advances》 |2019年第13期|共13页
  • 作者

    Song Shaolia; Wu Kun; Wu Huadong; Guo Jia; Zhang Linfeng;

  • 作者单位

    Wuhan Inst Technol Key Lab Green Chem Proc Minist Educ Wuhan 430205 Hubei Peoples R China;

    Wuhan Inst Technol Key Lab Novel Reactor &

    Green Chem Technol Hubei Wuhan 430205 Hubei Peoples R China;

    Wuhan Inst Technol Key Lab Green Chem Proc Minist Educ Wuhan 430205 Hubei Peoples R China;

    Wuhan Inst Technol Key Lab Green Chem Proc Minist Educ Wuhan 430205 Hubei Peoples R China;

    Wuhan Inst Technol Key Lab Green Chem Proc Minist Educ Wuhan 430205 Hubei 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