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Surface Treatment of Photocatalyst Metal Supports for VOCs Abatement Applications
KTH, School of Chemical Science and Engineering (CHE).
2016 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesisAlternative title
Ytbehandling av bärarmaterial för fotokatalysatorer tillämpade inom nedbrytning av VOC (Swedish)
Abstract [en]

In this work, the preparation of photocatalysts’ metal support for applications in purification

of industrial gas emissions has been studied. The supports normally used in literature are

ceramics, but they are not suitable for industrial applications. Stainless steel and aluminium

are much more common in full-scale reactors and were therefore chosen in this investigation.

Chemical etching, anodisation, electrochemical DC etching and AC etching treatment methods

were used to modify the surface morphology of aluminium and stainless steel plates in

order to improve the mechanical stability of photocatalyst (TiO2) coating. Two-part epoxysiloxane

hybrid (ESH) and sodium silicate adhesives have been evaluated for use as TiO2

binder. Dip and spray coating techniques were employed for preparing TiO2 coatings on

blank plates, pretreated plates, ESH and sodium silicate coated plates. Stainless steel electrochemically

etched in dilute aqua regia gave the most mechanically stable coating. It was

demonstrated that a high microscale surface roughness of the support improves the mechanical

stability of TiO2. Additionally, photocatalytic performance of the coating was higher

than that coated on ceramic support. The mechanical stability of TiO2 coated on ESH and

sodium silicate using dip and spray coating techniques was exceedingly improved. However,

Energy Dispersive Spectroscopy (EDS) analysis showed that TiO2 was embedded in the adhesives.

Nevertheless, sprinkling of TiO2 powder on sodium silicate presented a very stable

coating regardless of high TiO2 loading. It was also shown that coating of sodium silicate on

pretreated plates did not a↵ect the mechanical stability of TiO2 coating. A well coated and

uniform surface of TiO2 was achieved by spray coating technique.

Place, publisher, year, edition, pages
2016. , 40 p.
National Category
Chemical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-188571OAI: oai:DiVA.org:kth-188571DiVA: diva2:936703
Available from: 2017-05-05 Created: 2016-06-14 Last updated: 2017-05-05Bibliographically approved

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