Immobilized particle coating for optimum photon and TiO2 utilization in scaled air treatment photo reactors

被引：32

作者：

Lugo-Vega, Cristina S. ^{[1
]}

Serrano-Rosales, Benito ^{[2
]}

de Lasa, Hugo ^{[1
]}

机构：

[1] Univ Western Ontario, Dept Chem & Biochem Engn, Fac Engn Sci, CREC, London, ON N6A 5B9, Canada

[2] Univ Autonoma Zacatecas, Programa Ingn Quim, Unidad Acad Ciencias Quim, Campus UAZ Siglo 21,98168, Zacatecas 98000, Mexico

来源：

APPLIED CATALYSIS B-ENVIRONMENTAL | 2016年 / 198卷

基金：

加拿大自然科学与工程研究理事会;

关键词：

Air treatment; Photocatalysis; VOC; Acetone; Quantum yield; TiO2 immobilization methods; ANATASE THIN-FILMS; PHOTOCATALYTIC OXIDATION; BORNE POLLUTANTS; DEPOSITION; NANOPARTICLES; EFFICIENCIES; CATALYST; ACETONE; NANO; PURIFICATION;

D O I：

10.1016/j.apcatb.2016.05.063

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

This study reports the critical importance of the particle state in TiO2 immobilized photocatalysis. To address this, TiO2 coatings are prepared using two methods: an Air Assisted Spray with an Automatized Spinning Coating (TiO2-AAS-ASC) and a Spread Coating (TiO2-SCM). The state of the TiO2 particles is investigated using SEM and local gravimetry. It is proven that the TiO2-AAS-ASC displays homogeneity, limited particle agglomeration, close to optimum thickness and stability under flow. Furthermore, the prepared coatings are evaluated in terms of photoactivity using acetone in air mineralization in the 24-49 mu moI/L initial concentration range. This allows Quantum Efficiency evaluations based on absorbed photons and hydroxyl radical consumed. It is proven that the TiO2-AAS-ASC exhibits a close to expected optimum photoactivity and QYs in the 0.4-0.5 range. Furthermore, when the TiO2-AAS-ASC is assessed in terms of QY per unit weight of photocatalyst (QY/W), it shows a value 3 times higher than the TiO2-SCM. This high photon utilization is close to the best possible level expected for an optimized TiO2 coating. (C) 2016 Elsevier B.V. All rights reserved.

引用

页码：211 / 223

页数：13

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