Role of SiO2 in TiO2/SiO2 photocatalyst for hydrogen peroxide gas generation from air humidity via photocatalysis

IF 2.3 4区 化学 Q2 Agricultural and Biological Sciences Journal of Inclusion Phenomena and Macrocyclic Chemistry Pub Date : 2023-12-27 DOI:10.1007/s10847-023-01211-3
Tanongsak Sukkasem, Aroonsri Nuchitprasittichai, Supunnee Junpirom, Nattapat Pulsawat, Poonyapath Khumronrith, Sirawit Photongngam, Pattanapong Janphuang
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Abstract

This work aims to study the production of hydrogen peroxide gas (H2O2) through photocatalysis. It consists of two main parts. In the first part, we explore the optimal conditions for synthesizing H2O2 gas from humidity using a gas system photoreactor. Through experimentation, we discovered that the fabricated photoreactor, equipped with three series of coated photocatalyst-supporting plates, can synthesize H2O2 gas up to 3 ppmv. The photoreactor incorporates key components, including a photocatalyst material, UV light source, ventilation fan, and air filter. The identified optimal conditions included a relative humidity of 60‒65% RH and an air flow rate of 12.0 m/s. The TiO2/1%SiO2 photocatalyst, composed of SiO2 particles smaller than 63 μm, yielded the most favorable results. The second part focused on studying the role of SiO2 in TiO2/SiO2. We observed that modifying the TiO2 morphology with SiO2 created a pore structure on the surface. This structural modification leads to the formation of Ti‒O‒Si bonds, which facilitate electron and hole trapping on the photocatalyst surface. Furthermore, the presence of hydroxyl groups on the surface enhanced the attraction of reactant molecules. XRD results reveal a mixed-phase structure of TiO2 (anatase‒rutile)/SiO2 amorphous, contributing to improved electron and hole pathways within the photocatalyst.

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TiO2/SiO2 光催化剂中的 SiO2 在通过光催化从空气湿度中生成过氧化氢气体中的作用
这项工作旨在研究通过光催化产生过氧化氢气体(H2O2)。它包括两个主要部分。在第一部分中,我们利用气体系统光反应器探索了从湿气中合成 H2O2 气体的最佳条件。通过实验,我们发现所制造的光反应器配备了三个系列的涂层光催化剂支撑板,可以合成高达 3 ppmv 的 H2O2 气体。光反应器的关键部件包括光催化剂材料、紫外线光源、通风扇和空气过滤器。确定的最佳条件包括相对湿度为 60-65% RH,空气流速为 12.0 m/s。由小于 63 μm 的 SiO2 颗粒组成的 TiO2/1%SiO2 光催化剂取得了最理想的结果。第二部分重点研究了 SiO2 在 TiO2/SiO2 中的作用。我们观察到,用二氧化硅改变二氧化钛的形态会在表面形成孔隙结构。这种结构修饰导致了 Ti-O-Si 键的形成,从而促进了光催化剂表面的电子和空穴捕获。此外,表面羟基的存在增强了对反应分子的吸引力。XRD 结果表明,TiO2(锐钛矿-金红石型)/SiO2 无定形混合相结构有助于改善光催化剂内部的电子和空穴通路。
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来源期刊
CiteScore
3.30
自引率
8.70%
发文量
0
审稿时长
3-8 weeks
期刊介绍: The Journal of Inclusion Phenomena and Macrocyclic Chemistry is the premier interdisciplinary publication reporting on original research into all aspects of host-guest systems. Examples of specific areas of interest are: the preparation and characterization of new hosts and new host-guest systems, especially those involving macrocyclic ligands; crystallographic, spectroscopic, thermodynamic and theoretical studies; applications in chromatography and inclusion polymerization; enzyme modelling; molecular recognition and catalysis by inclusion compounds; intercalates in biological and non-biological systems, cyclodextrin complexes and their applications in the agriculture, flavoring, food and pharmaceutical industries; synthesis, characterization and applications of zeolites. The journal publishes primarily reports of original research and preliminary communications, provided the latter represent a significant advance in the understanding of inclusion science. Critical reviews dealing with recent advances in the field are a periodic feature of the journal.
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