Treating NOx gas Pollution by Visible Light Photocatalytic Reaction of S-doped TiO2 Nanotubes

IF 2.8 3区化学 Q2 CHEMISTRY, APPLIED

Topics in Catalysis Pub Date : 2024-05-23 DOI:10.1007/s11244-024-01972-2

Pho Thi Le, Thi Minh Cao, Tin Chanh Duc Doan, Viet Van Pham

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Abstract

The TiO₂ nanomaterial is a traditional photocatalyst that was applied externally in environmental and energy fields. However, a large band gap of TiO₂ is a limitation of this material in applications in visible-light regions. Sulfur (S) doped TiO₂ nanotubes were synthesized with different weight ratios of the S precursor and TiO₂ nanotubes by a thermal diffusion process. Techniques including Fourier transform infrared (FTIR), UV-vis diffuse reflection spectroscopy (DRS), photoluminescence spectroscopy (PL), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) were used to confirm the successful doping of the S-TiO₂ nanotubes. The treatment of nitrogen oxide (NO_x) gas through photocatalysis using S-doped TiO₂ nanotubes represents an innovative and environmentally friendly approach. Sulfur doping narrows the band gap of TiO₂ nanotubes (from 3.22 to 3.14 eV), allowing for better absorption of visible light. Furthermore, the photocatalytic NO_x removal performance of S-TiO₂ nanotubes was significantly enhanced with more than 40% NO at 500 ppb, and the efficiency of NO emission decreased significantly after five cycling tests.

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利用掺杂 S 的二氧化钛纳米管的可见光光催化反应处理氮氧化物气体污染

二氧化钛纳米材料是一种传统的光催化剂，被广泛应用于环境和能源领域。然而，TiO2 的带隙较大，限制了这种材料在可见光区域的应用。通过热扩散工艺，用不同重量比的硫前驱体和二氧化钛纳米管合成了掺硫（S）的二氧化钛纳米管。傅立叶变换红外光谱（FTIR）、紫外-可见漫反射光谱（DRS）、光致发光光谱（PL）、X 射线衍射（XRD）和 X 射线光电子能谱（XPS）等技术被用来确认 S-TiO2 纳米管的成功掺杂。利用掺硫二氧化钛纳米管进行光催化处理氮氧化物（NOx）气体是一种创新的环保方法。硫掺杂使二氧化钛纳米管的带隙变窄（从 3.22 到 3.14 eV），从而能更好地吸收可见光。此外，S-TiO2 纳米管的光催化去除氮氧化物性能显著提高，在 500 ppb 的条件下，氮氧化物的去除率超过 40%，而且经过五次循环测试后，氮氧化物的排放效率明显降低。

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来源期刊

Topics in Catalysis 化学-物理化学

CiteScore

5.70

自引率

5.60%

发文量

197

审稿时长

2 months

期刊介绍： Topics in Catalysis publishes topical collections in all fields of catalysis which are composed only of invited articles from leading authors. The journal documents today’s emerging and critical trends in all branches of catalysis. Each themed issue is organized by renowned Guest Editors in collaboration with the Editors-in-Chief. Proposals for new topics are welcome and should be submitted directly to the Editors-in-Chief. The publication of individual uninvited original research articles can be sent to our sister journal Catalysis Letters. This journal aims for rapid publication of high-impact original research articles in all fields of both applied and theoretical catalysis, including heterogeneous, homogeneous and biocatalysis.