Exploring the physicochemical properties of photocatalytic titanium dioxide and Zr-doped titanium dioxide films exposed to a carbon-polluting process

IF 3.9 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: B Pub Date : 2025-07-02 DOI:10.1016/j.mseb.2025.118546

K.M. Sequeira , L.E. Morinigo , G. Suarez , M. Manrique Olguin , L.R. Pizzio , F.P. Cometto , G. Bertolini , M.R. Tejerina

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Abstract

This study aims to evaluate the impact of exposure to a carbon-rich atmosphere on the physicochemical properties of TiO2 thin films, focusing on their optical and photocatalytic behavior. We also evaluate whether 5 % Zr doping (Zr/Ti atomic ratio) mitigates carbon contamination effects by stabilizing the anatase phase and improving charge separation. X-ray analysis confirmed the anatase phase in all the films. UV–Vis spectroscopy revealed a slight band gap reduction after 3 h: from 3.29 ± 0.01 eV to 3.24 ± 0.01 eV (TiO2) and from 3.39 ± 0.01 eV to 3.30 ± 0.01 eV, (Zr-doped TiO2) respectively. X-ray Photoelectron Spectroscopy confirmed Ti4+, Zr4+, and surface carbon species, with chemical state changes after thermal treatment. Photocatalytic tests showed that the apparent rate constant decreased with treatment time: for TiO2 from 8.6 × 10⁻⁴ min⁻¹ to 1.9 × 10⁻⁴ min⁻¹, and for Zr-doped TiO2 from 1.35 × 10⁻⁴ min⁻¹ to 3.96 × 10⁻⁴ min⁻¹. The results demonstrated decreased activity due to carbon contamination, partially mitigated by Zr doping.

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探讨碳污染过程中光催化二氧化钛和掺锆二氧化钛薄膜的物理化学性质

本研究旨在评估富碳环境对TiO2薄膜物理化学性质的影响，重点关注其光学和光催化行为。我们还评估了5% Zr掺杂（Zr/Ti原子比）是否通过稳定锐钛矿相和改善电荷分离来减轻碳污染效应。x射线分析证实了所有胶片中都有锐钛矿相。紫外可见光谱显示，TiO2在3 h后带隙减小，分别从3.29±0.01 eV减小到3.24±0.01 eV，从3.39±0.01 eV减小到3.30±0.01 eV。x射线光电子能谱证实了Ti4+、Zr4+和表面碳的种类，热处理后化学状态发生了变化。光催化实验表明，随着处理时间的延长，TiO2的表观速率常数从8.6 × 10−4 min−1降低到1.9 × 10−4 min−1，zr掺杂TiO2的表观速率常数从1.35 × 10−4 min−1降低到3.96 × 10−4 min−1。结果表明，碳污染导致活性降低，Zr掺杂部分减轻了活性。

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来源期刊

Materials Science and Engineering: B 工程技术-材料科学：综合

CiteScore

5.60

自引率

2.80%

发文量

481

审稿时长

3.5 months

期刊介绍： The journal provides an international medium for the publication of theoretical and experimental studies and reviews related to the electronic, electrochemical, ionic, magnetic, optical, and biosensing properties of solid state materials in bulk, thin film and particulate forms. Papers dealing with synthesis, processing, characterization, structure, physical properties and computational aspects of nano-crystalline, crystalline, amorphous and glassy forms of ceramics, semiconductors, layered insertion compounds, low-dimensional compounds and systems, fast-ion conductors, polymers and dielectrics are viewed as suitable for publication. Articles focused on nano-structured aspects of these advanced solid-state materials will also be considered suitable.