Comparative photocatalytic activity of sol-gel derived rare earth metal (La, Nd, Sm and Dy)-doped ZnO photocatalysts for degradation of dyes.
Comparative photocatalytic activity of sol-gel derived rare earth metal (La, Nd, Sm and Dy)-doped ZnO photocatalysts for degradation of dyes.
复制标题
DOI：
10.1039/c8ra01638k
复制
发表时间：
2018-05-09
期刊：
影响因子：
3.9
通讯作者：
Muneer, M.
中科院分区：
文献类型：
--
作者：
Alam, Umair;Khan, Azam;Ali, Danish;Bahnermann, Detlef;Muneer, M.
稀土金属掺杂到半导体氧化物中被认为是增强光催化活性的有效方法，因为它能够延迟激发时的电子-空穴对复合。在此，我们报道了使用简便的溶胶-凝胶路线合成不同稀土金属（La、Nd、Sm和Dy）掺杂的ZnO纳米颗粒，然后通过研究亚甲基蓝（MB）和罗丹明B（RhB）在紫外光照射下的降解来评估其光催化活性。采用不同的标准分析技术来研究所制备样品的微观结构和理化性质。通过 XRD 和 TEM 分析确定了 ZnO 六方纤锌矿结构的形成。此外，通过 XRD 平面向较低 θ 值的移动证实了稀土金属并入 ZnO 中。所有金属掺杂的ZnO对MB的降解均表现出较高的光催化活性，其中Nd掺杂的ZnO表现出最好的活性，降解效率为98%。此外，还观察到染料的矿化，表明掺 Nd ZnO 纳米颗粒在 180 分钟内去除了 68% TOC。还详细研究和讨论了不同操作参数对MB光降解的影响。此外，还提出了一种在 Nd 掺杂 ZnO 纳米颗粒上降解 MB 的可能光催化机制，并通过自由基捕获实验阐明了羟基自由基作为活性物质的参与。在本研究中，我们通过研究 UV 光照射下 MB 和 RhB 的降解情况，比较了溶胶-凝胶衍生的稀土金属（La、Nd、Sm 和 Dy）掺杂 ZnO 光催化剂的光催化活性。
Rare earth metal doping into semiconductor oxides is considered to be an effective approach to enhance photocatalytic activity due to its ability to retard the electron–hole pair recombination upon excitation. Herein, we report the synthesis of different rare earth metal (La, Nd, Sm and Dy)-doped ZnO nanoparticles using a facile sol–gel route followed by evaluation of their photocatalytic activity by studying the degradation of methylene blue (MB) and Rhodamine B (RhB) under UV-light irradiation. Different standard analytical techniques were employed to investigate the microscopic structure and physiochemical properties of the prepared samples. The formation of the hexagonal wurtzite structure of ZnO was established by XRD and TEM analyses. In addition, the incorporation of rare earth metal into ZnO is confirmed by the shift of XRD planes towards lower theta values. All metal doped ZnO showed improved photocatalytic activity toward the degradation of MB, of which, Nd-doped ZnO showed the best activity with 98% degradation efficiency. In addition, mineralization of the dye was also observed, indicating 68% TOC removal in 180 min with Nd-doped ZnO nanoparticles. The influence of different operational parameters on the photodegradation of MB was also investigated and discussed in detail. Additionally, a possible photocatalytic mechanism for degradation of MB over Nd-doped ZnO nanoparticles has been proposed and involvement of hydroxyl radicals as reactive species is elucidated by radical trapping experiments. In this study, we compared the photocatalytic activity of sol–gel derived rare earth metal (La, Nd, Sm and Dy)-doped ZnO photocatalysts by studying the degradation of MB and RhB under UV light irradiation.
登录
查看更多内容
可见光活性光催化剂铋硼共掺TiO2的合成、表征及应用
影响因子：
15.1
作者：
Bagwasi, Segomotso;Tian, Baozhu;Nasir, Muhammad
通讯作者：
Nasir, Muhammad
三维Ag2O/Bi5O7I p-n异质结光催化剂利用紫外-可见-近红外广谱光降解有机污染物
影响因子：
13.6
作者：
Chen, Yannan;Zhu, Gangqiang;Liu, Peng
通讯作者：
Liu, Peng
石墨烯基掺杂TiO2纳米复合材料的合成及光催化活性
影响因子：
6.7
作者：
Gu, Yongji;Xing, Mingyang;Zhang, Jinlong
通讯作者：
Zhang, Jinlong
影响因子：
--
作者：
Khatamian, M.;Khandar, A. A.;Ebrahimiasl, S.
通讯作者：
Ebrahimiasl, S.
影响因子：
--
作者：
Anandan, S.;Vinu, A.;Ariga, K.
通讯作者：
Ariga, K.