Cobalt-Doped ZnO Nanocomposits for Efficient Dye Degradation: Charge Transfer.

IF 2.5 4区 化学 Q2 CHEMISTRY, MULTIDISCIPLINARY ChemistryOpen Pub Date : 2024-09-09 DOI:10.1002/open.202400203
Buzuayehu Abebe, Bontu Kefale, Guta Amenu, Leta Guta, C R Ravikumar, Taymour A Hamdalla, S Giridhar Reddy, Dereje Tsegaye, H C Ananda Murthy
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Abstract

Doping enhances the optical properties of high-band gap zinc oxide nanoparticles (ZnO NPs), essential for their photocatalytic activity. We used the combustion approach to synthesize cobalt-doped ZnO heterostructure (CDZO). By creating a mid-edge level, it was possible to tune the indirect band gap of the ZnO NPs from 3.1 eV to 1.8 eV. The red shift and reduction in the intensity of the photoluminescence (PL) spectra resulted from hindrances in electron-hole recombination and sp-d exchange interactions. These improved optical properties expanded the absorption of solar light and enhanced charge transfer. The field emission scanning electron microscopy (FESEM) image and elemental mapping analysis confirmed the CDZO's porous nature and the dopant's uniform distribution. The porosity, nanoscale size (25-55 nm), and crystallinity of the CDZO were further verified by high-resolution transmission electron microscopy (HRTEM) and selected area electron image analysis. The photocatalytic activity of the CDZO exhibited much greater efficiency (k=0.131 min-1) than that of ZnO NPs (k=0.017 min-1). Therefore, doped heterostructures show great promise for industrial-scale environmental remediation applications.

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用于高效染料降解的钴掺杂氧化锌纳米复合材料:电荷转移。
掺杂可增强高带隙氧化锌纳米粒子(ZnO NPs)的光学特性,这对其光催化活性至关重要。我们采用燃烧法合成了掺钴氧化锌异质结构(CDZO)。通过创建中边电平,可以将氧化锌纳米粒子的间接带隙从 3.1 eV 调整到 1.8 eV。光致发光(PL)光谱的红移和强度降低源于电子-空穴重组和 sp-d 交换相互作用的阻碍。这些光学特性的改善扩大了对太阳光的吸收,并增强了电荷转移。场发射扫描电子显微镜(FESEM)图像和元素图谱分析证实了 CDZO 的多孔性和掺杂剂的均匀分布。高分辨率透射电子显微镜(HRTEM)和选区电子图像分析进一步验证了 CDZO 的多孔性、纳米级尺寸(25-55 nm)和结晶度。CDZO 的光催化活性效率(k=0.131 min-1)远高于 ZnO NPs(k=0.017 min-1)。因此,掺杂异质结构在工业规模的环境修复应用中大有可为。
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来源期刊
ChemistryOpen
ChemistryOpen CHEMISTRY, MULTIDISCIPLINARY-
CiteScore
4.80
自引率
4.30%
发文量
143
审稿时长
1 months
期刊介绍: ChemistryOpen is a multidisciplinary, gold-road open-access, international forum for the publication of outstanding Reviews, Full Papers, and Communications from all areas of chemistry and related fields. It is co-owned by 16 continental European Chemical Societies, who have banded together in the alliance called ChemPubSoc Europe for the purpose of publishing high-quality journals in the field of chemistry and its border disciplines. As some of the governments of the countries represented in ChemPubSoc Europe have strongly recommended that the research conducted with their funding is freely accessible for all readers (Open Access), ChemPubSoc Europe was concerned that no journal for which the ethical standards were monitored by a chemical society was available for such papers. ChemistryOpen fills this gap.
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