Rapid NO conversion with an enhanced Sm+3-TiO2 photocatalyst

IF 2.1 4区物理与天体物理 Q3 PHYSICS, CONDENSED MATTER Solid State Communications Pub Date : 2024-09-08 DOI:10.1016/j.ssc.2024.115692

A. Alviz-Meza , X. Sierra-González , A. Martínez-de la Cruz , J.A. Colina-Marquez

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Abstract

Nitrogen oxides (NO_x) are known for having a significant greenhouse effect and provoking several health issues. Because of that, it is necessary to find an effective manner to remove them from polluted air. In this study, samarium-doped titania was synthesized via sol-gel using two different synthesis routes and varying the calcination temperature and the Sm³⁺ content. The main difference between the two syntheses was the pH solution. The acidic pH favored the presence of the anatase crystalline phase, the most photoactive and interesting for photocatalytic applications. Furthermore, these catalysts were evaluated in a lab-scale UV photoreactor following the NO conversion via chemiluminescence, according to the ISO standard 22197–1. The Sm content positively affected the NO removal. The highest NO conversion was 92 %, with the doped titania obtained at a calcination temperature of 500 °C and with 0.5 % wt. of samarium. This result was congruent with the reported literature's energy bandgap estimated (2.98 eV).

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利用增强型 Sm+3-TiO2 光催化剂快速转化氮氧化物

众所周知，氮氧化物（NOx）具有显著的温室效应，并引发多种健康问题。因此，有必要找到一种有效的方法来清除污染空气中的氮氧化物。本研究采用两种不同的合成路线，并改变煅烧温度和 Sm3+ 的含量，通过溶胶-凝胶法合成了掺钐的二氧化钛。两种合成方法的主要区别在于溶液的 pH 值。酸性 pH 有利于锐钛矿晶相的出现，而锐钛矿晶相光活性最强，对光催化应用很有吸引力。此外，根据 ISO 22197-1 标准，在实验室规模的紫外光反应器中通过化学发光对这些催化剂进行了氮氧化物转化评估。Sm 的含量对氮氧化物的去除率有积极影响。在煅烧温度为 500 ℃、钐含量为 0.5% 的掺杂二氧化钛中，氮氧化物的转化率最高，达到 92%。这一结果与文献报道的能带隙估计值（2.98 eV）一致。

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来源期刊

Solid State Communications 物理-物理：凝聚态物理

CiteScore

3.40

自引率

4.80%

发文量

287

审稿时长

51 days

期刊介绍： Solid State Communications is an international medium for the publication of short communications and original research articles on significant developments in condensed matter science, giving scientists immediate access to important, recently completed work. The journal publishes original experimental and theoretical research on the physical and chemical properties of solids and other condensed systems and also on their preparation. The submission of manuscripts reporting research on the basic physics of materials science and devices, as well as of state-of-the-art microstructures and nanostructures, is encouraged. A coherent quantitative treatment emphasizing new physics is expected rather than a simple accumulation of experimental data. Consistent with these aims, the short communications should be kept concise and short, usually not longer than six printed pages. The number of figures and tables should also be kept to a minimum. Solid State Communications now also welcomes original research articles without length restrictions. The Fast-Track section of Solid State Communications is the venue for very rapid publication of short communications on significant developments in condensed matter science. The goal is to offer the broad condensed matter community quick and immediate access to publish recently completed papers in research areas that are rapidly evolving and in which there are developments with great potential impact.