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Influence of cationic doping at different sites in NaNbO 3 on the photocatalytic degradation of methylene blue dye
Journal of Sol-Gel Science and Technology ( IF 2.5 ) Pub Date : 2020-07-20 , DOI: 10.1007/s10971-020-05365-1
Runia Jana , Aayush Gupta , Raveena Choudhary , O. P. Pandey

The present study presents the preparation of Nb-based perovskite with different cationic dopants (potassium and vanadium) for the catalytic photodegradation of methylene blue (MB) dye. For the preparation of powder samples, chemical route followed by heat treatment (at 800 °C) was adopted and X-ray diffraction confirmed the phase formation. Furthermore, scanning electron microscopy (SEM/EDX) and X-ray photoelectron spectroscopy supported the successful incorporation of dopants in NaNbO3 lattice. Furthermore, the induced lattice distortion and resulted optical modification were determined by uniform strain model and UV–visible spectroscopy, respectively. As a result of inclusion of dopants, photodegradation of MB dye under household CFL exposure has been studied in detail by considering the different dye concentrations (1, 5, and 10 mg/L). Doping at both sites (A and B) in NaNbO3 exhibited better photocatalytic efficiency (34%) in 5 h of illumination as compared to single cation-doped systems which can be associated to the higher content of lattice defects (as charge trap centers), reduced optical band gap and oxygen vacancies. Furthermore, intraparticle diffusion model suggested that low concentration of dye solution exhibited surface diffusion mechanism, while higher concentration followed boundary layer diffusion mechanism for the photodegradation of MB dye.



中文翻译:

NaNbO 3中不同位置的阳离子掺杂对亚甲基蓝染料光催化降解的影响

本研究提出了具有不同阳离子掺杂剂(钾和钒)的Nb基钙钛矿的制备,以催化亚甲基蓝(MB)染料的光降解。对于粉末样品的制备,采用化学路线,然后进行热处理(在800°C下进行),X射线衍射证实了相的形成。此外,扫描电子显微镜(SEM / EDX)和X射线光电子能谱支持将掺杂剂成功掺入NaNbO 3中格子。此外,分别通过均匀应变模型和紫外可见光谱法确定了诱发的晶格畸变和产生的光学修饰。由于包含了掺杂剂,已经通过考虑不同的染料浓度(1、5和10 mg / L)详细研究了家用CFL暴露下MB染料的光降解。在NaNbO 3的两个位置(A和B)掺杂与单一阳离子掺杂体系相比,在5 h的光照下具有更好的光催化效率(34%),这可能与较高的晶格缺陷含量(作为电荷陷阱中心),减少的光学带隙和氧空位有关。此外,颗粒内扩散模型表明低浓度的染料溶液表现出表面扩散机理,而较高浓度的染料遵循边界层扩散机理对MB染料进行光降解。

更新日期:2020-07-20
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