Titanium Dioxide Photocleans Polluted Air

Burton, Adrian

doi:10.1289/ehp.120-a229

Cited by 13 publications

(8 citation statements)

References 2 publications

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“…A field trial conducted at a train station in Manila (Philippines) by coating a 4100-m 2 exterior wall with TiO 2 -based photocatalytic paint (Cristal Global) showed that about 26 g of NO x per 100 m 2 of painted surface was removed; it was also claimed that each painted square meter could remove 80 g of NO x per year [154,155]. In another trial that ran over a four-year period, a 135 m 2 wall in London was treated with a Cristal photocatalytic paint; the company claimed a reduction of 60% of NO and 20% of NO 2 in the vicinity of the wall (again short in details regarding the exact physical steps taken in the trials).…”

Section: Denoxing the Outdoor Environment With Tio 2 Photocatalytic Cmentioning

confidence: 99%

“…Thus far, the description of some field trials carried out under a variety of experimental approaches and conditions that could not be controlled, as the trials were performed in an open air environment, have led to a large variation in results associated with the extent of TiO 2 -based photocatalytic removal of NO x gases. Accordingly, it is worth summarizing the results, which are collected in Table 10 [14,15,134,[136][137][138][139]149,[152][153][154][155][156][157]159,160]. Clearly, the results are all over the place.…”

Section: Denoxing the Outdoor Environment With Tio 2 Photocatalytic Cmentioning

confidence: 99%

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Heterogeneous Photocatalysis and Prospects of TiO2-Based Photocatalytic DeNOxing the Atmospheric Environment

Serpone

2018

Catalysts

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This article reviews the efforts of the last two decades to deNOxify the atmospheric environment with TiO2-based photocatalytic materials supported on various cementitious-like substrates. Prior to undertaking this important aspect of applied photocatalysis with metal-oxide emiconductor photocatalysts, however, it is pertinent to describe and understand the fundamentals of Heterogeneous Photocatalysis. The many attempts done in a laboratory setting to degrade (deNOxify) the major components that make up the NOx, namely nitric oxide (NO) and nitrogen dioxide (NO2), but most importantly the efforts expended in deNOxifying the real environment upon depositing titania-based coatings on various model and authentic infrastructures, such as urban roads, highway noise barriers, tunnels, and building external walls among others, are examined. Both laboratory and outdoor experimentations have been performed toward NOx being oxidized to form nitrates (NO3−) that remain adsorbed on the TiO2-based photocatalytic surfaces (except in tunnels—indoor walls) but get subsequently dislodged by rain or by periodic washings of the infrastructures. However, no serious considerations have been given to the possible conversion of NOx via photocatalytic reduction back to N2 and O2 gases that would restore the atmospheric environment, as the adsorbed nitrates block the surface-active sites of the photocatalyst and when washed-off ultimately cause unduly damages to the environment.

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Section: Denoxing the Outdoor Environment With Tio 2 Photocatalytic Cmentioning

confidence: 99%

Section: Denoxing the Outdoor Environment With Tio 2 Photocatalytic Cmentioning

confidence: 99%

Heterogeneous Photocatalysis and Prospects of TiO2-Based Photocatalytic DeNOxing the Atmospheric Environment

Serpone

2018

Catalysts

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“…Inspired from photosynthesis process, photocatalytic effects work in the combination of air humidity, UV radiation, oxygen, and nanoscale catalyst TiO 2 being a basis for industrial self-cleaning paints and other industrial applications [28]. Having some commercial examples available, photocatalytic TiO 2 nanoparticles are able to clean air of automobile-produced nitrogen oxides (NO X ), providing them with extra functionality [29] (see Section 4.3). Anti-reflectivity is an important functionality for surfaces that may be useful for energy-efficient façade applications.…”

Section: Biomimetic Building Materials and Techniques For Façade Applmentioning

confidence: 99%

Biomimetic Facade Applications for a More Sustainable Future

Tokuç¹,

Özkaban²,

Andiç‐Çakır³

2018

Interdisciplinary Expansions in Engineering and Design With the Power of Biomimicry

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Mankind has often taken inspiration from the nature to solve problems since nature has sophisticated processes, refined for thousands of years. While manmade systems are unsustainable, natural processes embody sustainability principles; therefore, there are many things to learn from nature in order to solve design problems and create a more sustainable future. This is the promise of a biomimetic design approach. Another design approach is biodesign, and it also involves utilizing natural elements inside the design. The building façade is a problematic research area since it is at the intersection between living spaces and natural environment; thus it faces many problems especially regarding energy-air-water transition between indoors and outdoors. Application of key sustainability concepts in architecture such as energy requirements, form and structure, and sustainability considerations can be enhanced by learning from natural processes. This chapter looks at cutting-edge design principles, materials, and designs in building façades through the lens of biomimetics and biodesign. First, the design principles and then the materials and some cases are explained. The concepts of biomimicry and biodesign are in harmony with the concept of sustainability; however, to reach sustainable façade solutions, the sustainability principles should be at the core of the design problem definition. paradigm shifts. Biomimicry is a relatively new term, yet its connotations have been part of architecture for millennia, especially in form generation and imitating structural systems. While our interpretation for the earliest works is mostly conjecture, the written works relate the architectural styles of art nouveau, streamline design, anthropomorphism, zoomorphism, biomorphism, organic design, and biologically inspired design as precursors to biomimetics, biomimesis, or bionic [1]. While some designers and researchers interpret biomimicry as an all-encompassing approach to learn from nature (such as the biomimicry institute), others argue it should only be used to identify mimicking biological processes, and other phenomena should be called by different names. These include biophilia (love of nature) for taking inspiration from natural forms [2], biomimesis for imitation of natural models and systems, and geomimicry for utilizing geological processes instead of biological ones.Biomimetic Facade Applications for a More Sustainable Future http://dx.doi.org/10.5772/intechopen.73021 95

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“…While the air slowly flows upward through the filter media, the contaminants in the air stream are absorbed and metabolized by 41 F. Adler the microorganisms, which then expel clean oxygen as a byproduct. The purified air passes out of the top of the biofilter and into the atmosphere 42 .…”

Section: 4mentioning

confidence: 99%

“…However, larger distances also mean that the biofilms in a biotrckling filter have to be kept moist to maintain bioactivity. Air flowing 42 Schmidt, David, Larry Jacobson, and Richard Nicolai. "Biofilter Design Information."…”

Section: 4mentioning

confidence: 99%

Creating Holistic Architecture: Unifying Natural Ecology with Technology Through Design

Herschorn¹

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Titanium Dioxide Photocleans Polluted Air

Cited by 13 publications

References 2 publications

Heterogeneous Photocatalysis and Prospects of TiO2-Based Photocatalytic DeNOxing the Atmospheric Environment

Heterogeneous Photocatalysis and Prospects of TiO2-Based Photocatalytic DeNOxing the Atmospheric Environment

Biomimetic Facade Applications for a More Sustainable Future

Creating Holistic Architecture: Unifying Natural Ecology with Technology Through Design

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