TiO2纳米结构的相变和带隙调制增强可见光活性和环境应用。

IF 3.9 2区 综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES
Rajwali Khan, Nasir Rahman, Adhimoorthy Prasannan, Khayriniso Ganiyeva, Sabyasachi Chakrabortty, Sambasivam Sangaraju
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引用次数: 0

摘要

由于其在气候和能源领域的广泛应用,提高TiO2纳米粒子的可见光活性仍然是光催化领域的关键挑战。有趣的是,这项工作研究了掺杂Al3 + /Al2 +和S 26 +离子的TiO2纳米颗粒的相变、结构、光学和光催化特性。结果表明,纯TiO2纳米颗粒中锐钛矿相(AP)占主导地位(100%),而金红石相(RP)含量增加,X1 (Al = 2%, S = 2%)的RP含量达到20±2.1%,X4 (Al = 2%, S = 8%)的RP含量下降到12±1.2%。Al3 + /Al2 +和S 26 +的引入诱导了氧空位(Ovs),改变了相的稳定性,相变能量降至- 0.033 eV,促进了AP向RP的转变。掺杂剂的有效集成表明,x系列纳米颗粒的光致发光光谱中的红移和强度降低是由于带隙减小(纯TiO2的带隙从3.23 eV减小到X4的1.98 eV)和Al/S掺杂引起的晶格畸变。喇曼光谱结果表明,掺杂物引起的晶格应变导致了光谱峰展宽和位移,这证实了掺杂物通过红外光谱峰移的存在。ESR研究发现Ti3 + -Ovs配合物中有顺磁中心,表明了缺陷诱导的磁性特征。当亚甲基蓝(MB)染料在可见光下被光催化时,表现出比纯TiO2更高的活性和降解效率。准一级动力学结果表明,共掺杂有效地提高了光催化活性。X4的速度常数为0.017分钟,比纯TiO2纳米颗粒的速度常数7.28 × 10分钟要高得多。最后,锐钛矿x系列样品在150 min内降解MB的最高速率为96.4%,优于未掺杂的TiO2(15%)和金红石-TiO2纳米颗粒(65%)。其基本机制解释了TiO2的光催化特性是通过共掺杂调节的,这就是为什么这些化合物是环境修复应用的潜在候选者。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Phase transition and bandgap modulation in TiO2 nanostructures for enhanced visible-light activity and environmental applications.

Due to its wide-ranging applications in the climate and energy fields, enhancing the visible-light photoactivity of TiO2 nanoparticles remains a crucial challenge in photocatalysis. Interestingly, this work examined the phase transition, structural, optical, and photocatalytic characteristics of TiO2 nanoparticles doped with Al3⁺/Al2⁺ and S⁶⁺ ions. It was observed that the anatase phase (AP) dominates in pure TiO2 (100%) nanoparticles, whereas the rutile phase (RP) content increases in doped samples, reaching 20 ± 2.1% for X1 (Al = 2%, S = 2%) and falling to 12 ± 1.2% in X4 (Al = 2%, S = 8%). The introduction of Al3⁺/Al2⁺ and S⁶⁺ induces oxygen vacancies (Ovs) and alters the phase stability, as evidenced by the reduction of transformation energy to - 0.033 eV, facilitating the AP to RP transition. The effective integration of dopants indicates that a redshift and intensity in the Photoluminescence spectrum reduced by X-series nanoparticles is due to band gap reductions (from 3.23 eV for pure TiO2 to 1.98 eV for X4) and distortions in the lattice generated by Al/S doping. Raman spectroscopy results show peak broadening and shifts due to lattice strain from dopants, which validates dopant incorporation via peak shifts in Fourier-transform infrared spectroscopy. ESR study reveals paramagnetic centers in Ti3⁺-Ovs complexes, indicating defect-induced magnetic characteristics. When methylene blue (MB) dye is photocatalyzed under visible light exhibits increased activity and degradation efficiencies that are higher than pure TiO2. The pseudo-first-order kinetic results show that co-doping effectively improves photocatalytic activity. Rate constants of 0.017 min⁻1 for X4 are found to be much higher than 7.28 × 10⁻4 min⁻1 for pure TiO2 nanoparticles. Finally, anatase X-series samples degraded MB at a maximum rate of 96.4% in 150 min, outperforming undoped TiO2 (15%) and rutile-TiO2 nanoparticles (65% degradation). The fundamental mechanism explains that the photocatalytic characteristics of TiO2 are modulated by co-doping, which is why these compounds are potential candidates for environmental remediation applications.

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来源期刊
Scientific Reports
Scientific Reports Natural Science Disciplines-
CiteScore
7.50
自引率
4.30%
发文量
19567
审稿时长
3.9 months
期刊介绍: We publish original research from all areas of the natural sciences, psychology, medicine and engineering. You can learn more about what we publish by browsing our specific scientific subject areas below or explore Scientific Reports by browsing all articles and collections. Scientific Reports has a 2-year impact factor: 4.380 (2021), and is the 6th most-cited journal in the world, with more than 540,000 citations in 2020 (Clarivate Analytics, 2021). •Engineering Engineering covers all aspects of engineering, technology, and applied science. It plays a crucial role in the development of technologies to address some of the world''s biggest challenges, helping to save lives and improve the way we live. •Physical sciences Physical sciences are those academic disciplines that aim to uncover the underlying laws of nature — often written in the language of mathematics. It is a collective term for areas of study including astronomy, chemistry, materials science and physics. •Earth and environmental sciences Earth and environmental sciences cover all aspects of Earth and planetary science and broadly encompass solid Earth processes, surface and atmospheric dynamics, Earth system history, climate and climate change, marine and freshwater systems, and ecology. It also considers the interactions between humans and these systems. •Biological sciences Biological sciences encompass all the divisions of natural sciences examining various aspects of vital processes. The concept includes anatomy, physiology, cell biology, biochemistry and biophysics, and covers all organisms from microorganisms, animals to plants. •Health sciences The health sciences study health, disease and healthcare. This field of study aims to develop knowledge, interventions and technology for use in healthcare to improve the treatment of patients.
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