UV stability of polyurethane binding agent on multilayer photocatalytic TiO2 coating

Kasanen, Jussi; Suvanto, Mika; Pakkanen, Tuula T.

doi:10.1016/j.polymertesting.2011.02.006

Cited by 15 publications

(9 citation statements)

References 42 publications

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“…Although the performance of sol-gel dip coating is satisfactory in terms of coating stability, the high temperature (typically higher than 400°C) heat treatment step for annealing after coating is not applicable to the textile-structured substrates without losing their physical and chemical integrity (Lim et al, 2009). Other coating methods, such as spin coating, electrochemical deposition, electrophoretic coating, and sputtering etc., usually have complicated steps to achieve the preferable film thickness and are also costly and difficult for practical application (Byrne et al, 1998;Kasanen et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Preparation of TiO2-Coated Polyester Fiber Filter by Spray-Coating and Its Photocatalytic Degradation of Gaseous Formaldehyde

Han

Chang

Zhang

et al. 2012

Aerosol Air Qual. Res.

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Heterogeneous photocatalytic oxidation (PCO) has shown great potential for indoor air purification of gaseous pollutants. Research attention has been drawn to the synthesis of new functional photocatalysts, as well as to kinetic studies of the influences of various reaction parameters, e.g., relative humidity. Nevertheless, when applied for practical use, the coating method and coating stability of are also important factors that will directly affect the removal efficiency. In the present study, a simple and economical spray coating method was developed to effectively immobilize TiO 2 nanoparticles onto a polyester fiber filter at low temperature. Colloidal silica was added as a binder in the coating suspension. PCO efficiency evaluation of the coating was carried out using gaseous formaldehyde. The results indicate that the formaldehyde removal rate is associated with the amount of binder added. The highest removal rate was achieved for a coating with the TiO 2 to binder (SiO 2 equivalent) mass ratio of 1:1, with the results supported by XRF, SEM, FTIR and BET analyses. As compared to the conventional dip coating method, the spray-coated sample showed much higher PCO efficiency and stability, which may be mainly attributed to the more uniform dispersion of the catalyst and the stronger binding formed during high pressure spray coating. This coating method has great potential for large-scale applications of immobilized photocatalyst for indoor air purification.

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Section: Introductionmentioning

confidence: 99%

Preparation of TiO2-Coated Polyester Fiber Filter by Spray-Coating and Its Photocatalytic Degradation of Gaseous Formaldehyde

Han

Chang

Zhang

et al. 2012

Aerosol Air Qual. Res.

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“…Although Cannon et al (2005) reported that a small amount of trimesic acid helped form a superior coating film of TiO 2 , we saw superior coating with no binder. Our result probably occurred because the sponge-type carriers are made of polyurethane, which is widely used as a binder for TiO 2 coating (Taheran et al, 2011;Kasanen et al, 2009Kasanen et al, , 2011. Thus, polyurethane w a t e r r e s e a r c h 4 6 ( 2 0 1 2 ) 6 4 8 9 e6 4 9 6 could take the place of trimesic acid as a binder that reduces the surface energy of TiO 2 and promotes the coating process (Eder and Windle, 2008).…”

Section: Improved Tio 2 Coating Pattern and Enhanced Photocatalytic Ementioning

confidence: 92%

Developing an efficient TiO2-coated biofilm carrier for intimate coupling of photocatalysis and biodegradation

Park

Rittmann

2012

Water Research

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“…rutile with effective surface area of roughly 50 m 2 /g) on to different substrates. PU, a curable organic polymer, has been reported to be used as binder for coating of TiO 2 on plate type substrates (Kasanen, Suvanto et al 2009;Kasanen, Suvanto et al 2011). By changing the PU dispersion/H 2 O ratio, stable coating can be obtained (Kasanen, Suvanto et al 2011).…”

Section: Preparation Of Different Coating Combinations By Novel Spraymentioning

confidence: 99%

“…PU, a curable organic polymer, has been reported to be used as binder for coating of TiO 2 on plate type substrates (Kasanen, Suvanto et al 2009;Kasanen, Suvanto et al 2011). By changing the PU dispersion/H 2 O ratio, stable coating can be obtained (Kasanen, Suvanto et al 2011). Colloidal silica, usually used as surfactant and high temperature binder in the industry, is seldom reported being used as binding agent for photocatalyst coating in literature (Holland 2007).…”

Section: Preparation Of Different Coating Combinations By Novel Spraymentioning

confidence: 99%

“…The mixed suspension was then further stirred for several hours till the uniform TiO 2 slurry was observed. (Kasanen, Suvanto et al 2011) After the coating suspensions were prepared, a Navite F-75G spray gun (Navite, China) was used for spray coating, with nitrogen as the carrier gas under a high pressure of 65 psi. The spray distance from the nozzle exit to the substrate surface was optimized at 150 mm to minimize the waste of coating suspensions.…”

Section: Preparation Of Different Coating Combinations By Novel Spraymentioning

confidence: 99%

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Indoor air purification using heterogeneous photocatalytic oxidation

Han¹

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Heterogeneous photocatalytic oxidation (PCO) is a very promising technology for mineralization of gaseous contaminants such as formaldehyde and other volatile organic compounds (VOCs) existing in the typical indoor environment. Current problems encountered when implementing PCO for indoor air purification include ineffective immobilization, low degradation efficiency and lack of UV light source indoors. This project experimentally investigated the photocatalyst immobilization method as well as visible-light induced PCO of gaseous formaldehyde. An easy and cost-effective spray-coating method was established through optimizing the substrate material, stabilization temperature, binder types and binder dosages. The effects from different limiting factors for the visible-light PCO reaction, such as volumetric flow rate, contaminant initial concentration, relative humidity, visible light intensity and photocatalyst loading amount, were carefully tested in a fix-bed PCO reaction system. The possible mechanisms of visible-light PCO of gaseous formaldehyde were explored by using two visible-light active photocatalysts and comparing between UV-PCO and visible-light PCO processes. A prototype indoor air cleaner equipped with visible-light PCO component was designed based on the scientific findings of the lab scale experiment. Its cleaning effectiveness was evaluated through environmental chamber test. The result shows considerable removal efficiency for both formaldehyde and other existing VOCs such as toluene. Relatively high clean air delivery rate (CADR), in comparing with other commercialized PCO air cleaners, was achieved for gaseous contaminants indoors with energy-efficient LED light source. This study provides a better understanding of visible-light induced PCO of gaseous contaminants, which might be used for design and preparation of high-performance indoor air cleaning devices. The spray-coating method is effective, economical and can be easily applied for large-scale photocatalyst immobilization.

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UV stability of polyurethane binding agent on multilayer photocatalytic TiO2 coating

Cited by 15 publications

References 42 publications

Preparation of TiO2-Coated Polyester Fiber Filter by Spray-Coating and Its Photocatalytic Degradation of Gaseous Formaldehyde

Preparation of TiO2-Coated Polyester Fiber Filter by Spray-Coating and Its Photocatalytic Degradation of Gaseous Formaldehyde

Developing an efficient TiO2-coated biofilm carrier for intimate coupling of photocatalysis and biodegradation

Indoor air purification using heterogeneous photocatalytic oxidation

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