Preparation, testing and performance of a TiO2/polyester photocatalyst for the degradation of gaseous methanol

Mejía, Maria Isabel; Marín, Juan; Restrepo, Gloria; Ríos, Luis; Pulgarín, C.; Kiwi, J.

doi:10.1016/j.apcatb.2009.11.005

Cited by 57 publications

(28 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, the stiffness and weight of the materials impose limitations for large-scale implementation. Textile-structured polymer materials, such as polyester (Mejía et al, 2010), cellulose acetate (Coronado et al, 2008), cotton textiles (Yuranova et al, 2006), and wool-polyamide (Bozzi et al, 2005), have also been studied in recent years for their low cost, flexibility and large surface area. Polyester, commonly referring to polyethylene terephthalate (PET), is one of the most stable and widely used artificial fabrics in the industry.…”

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.

View full text Add to dashboard Cite

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.

show abstract

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.

View full text Add to dashboard Cite

show abstract

“…Preparation of SiO 2 -TiO 2 suspension According to the procedure described by Mejia et al [21], the TiO 2 -SiO 2 suspension was prepared in two steps: first, a sol-gel of SiO 2 was prepared by ageing during 24h of isopropyl alcohol (isop-OH, Merck), hydrochloric acid (HCl, Merck), tetraethyl orthosilicate (TEOS, Merck) and distilled water. Second, TiO 2 P-25 (Evonik-Degussa) with surface area of 50m 2 /g and gap energy of 3.2eV [5,12] 2 .…”

Section: Methodsmentioning

confidence: 99%

“…According to Mejia et al [21], these reactions lead to the formation of a three-dimensional network of ≡ Si-O-Si ≡. The principal function of this network is to trap the TiO 2 and keep it stationary on the fabric such as it is observed in SEM analysis.…”

Section: The Presence Of Si-o-si and Si-oh In The Samplesmentioning

confidence: 99%

“…This behavior evidences that the photocatalytic activity of modified PE samples may depend on the TiO 2 /SiO 2 ratio in the coating surface. Mejia et al [21] showed that samples with immersion times up to 11h increase in %TiO 2 loading compared with lower immersion times. Here, a different result was observed for samples with 4 and 5.5h immersion time that show a higher difference in TiO 2 -SiO 2 adhesion (Figure 4) but a negligible difference in photocatalytic activity as compared to higher immersion times.…”

Section: Photocatalytic Activity and Coating Loss Of Modified Pe Sampmentioning

confidence: 99%

“…In 2008, Li et al [20] studied the interaction between silica and certain fabrics such as cotton, linen, nylon and polyester, and determined that the adhesion of the coatings of SiO 2 in synthetic fabrics is mainly the result of thermodynamic affinities, dipole-dipole interactions and hydrogen bonds, while the adhesion over fabrics based on cellulose is produced by covalent bonds formed between the precursor groups of the silica and hydroxyl groups of the fabric. In 2010, Mejia et al [21] reported that different fabric samples coated by the immersion of polyester in a suspension of TiO 2 -SiO 2 were sufficiently active to degrade gaseous methanol. They also found a relationship between the immersion time of the fabric and its photocatalytic activity.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Synthesis variables effect on TiO2/polyester fabrics photoactivity and stability

Velasco

Castro

Giraldo

2016

rev.ion

View full text Add to dashboard Cite

TiO 2 -SiO 2 coatings on fabric samples were obtained by immersion of 9cm 2 of commercial polyester in a TiO 2 -SiO 2 suspension. This suspension was prepared by adding TiO 2 P25 to a silica matrix obtained from the hydrolysis of tetraethyl orthosilicate (TEOS). The aim of this work was to study the relationship between the immersion time of the fabric on the photocatalytic activity and stability of the coating against several cycles of use and washing. Obtained samples were characterized by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and infrared spectroscopy (FTIR-ATR). Evaluation of modified fabrics was performed by self-disinfection tests under 250W/m 2 of simulated sunlight using E. coli as model bacteria. In general, all modified fabrics (except that obtained at 2h immersion time) inactivated bacteria in less than 120min and its regrowth was prevented for at least 24h after the disinfection tests. It was determined that low immersion time (3-4h) lead to active and stable fabrics to 3 cycles of use and washing, whereas higher immersion times (12h) lead to more active but unstable fabrics. Keywords: coated fabric, TiO 2 -SiO 2 , photocatalysis, E. coli inactivation. ResumenMuestras de tela recubiertas con TiO 2 -SiO 2 fueron obtenidas por inmersión de un poliéster comercial de 9cm 2 en una suspensión de TiO 2 -SiO 2 . Esta suspensión se preparó adicionando TiO 2 P25 a una matriz de sílice sintetizada mediante la hidrólisis de ortosilicato de tetraetilo (TEOS). El objetivo de este trabajo fue estudiar la relación entre el tiempo de inmersión de la tela, y la actividad fotocatalítica y estabilidad del recubrimiento a varios ciclos de uso y lavado. Las muestras obtenidas fueron caracterizadas por microscopía electrónica de barrido (SEM), espectroscopía de energía dispersiva (EDS) y espectroscopía infrarroja (FTIR-ATR). La evaluación de los textiles se llevó a cabo mediante pruebas de autodesinfección bajo 250W/m 2 de luz solar simulada usando E. coli como microorganismo modelo. En general, todas las telas modificadas (excepto las obtenidas con 2h de inmersión) inactivaron la bacteria en menos de 120min, previniendo su recrecimiento bacteriano al menos por 24h después de las pruebas de desinfección. Se determinó que los tiempos de inmersión bajos (3-4h) dejan telas activas y estables a 3 ciclos de uso y lavado, mientras que tiempos de inmersión más altos (12h) dejan telas más activas pero inestables. ResumoAmostras de tecido revestidas com TiO 2 -SiO 2 foram obtidos por imersão de um poliéster comercial de 9cm 2 em uma suspensão de TiO 2 -SiO 2 . Esta suspensão foi preparada por adição de TiO 2 P25 a uma matriz de sílica sintetizado por hidrólise de ortossilicato de tetraetilo (TEOS). O objetivo deste trabalho foi estudar a relação entre o tempo de imersão do tecido, e a atividade fotocatalítica e a estabilidade do revestimento a vários ciclos de utilização e de lavagem. As amostras obtidas foram caracterizadas por microscopia eletrônica de varredura (MEV), espectroscopia p...

show abstract

Thermal stability and flame retardancy of polyester, cotton, and relative blend textile fabrics subjected to sol–gel treatments

Alongi

Ciobanu

Tata

et al. 2010

J of Applied Polymer Sci

124

View full text Add to dashboard Cite

Polyester (PET), cotton (COT), and two relative blend textile fabrics were treated by sol-gel processes. Tetraethoxysilane (TEOS) was used as inorganic precursor of silica phases; furthermore, different TEOS/ H 2 O ratios were examined to explore the effect of the presence of SiO 2 on the thermal and fire stability of the textile fabrics investigated. The distribution and dispersion of SiO 2 were observed by means of scanning electronic microscopy (SEM). SEM magnifications showed the formation of a continuous silica film located in the neighboring fibers; furthermore, in the case of PET, such a film incorporated silica particles with an average diameter ranging between 0.2 and 6 lm. The thermal and thermooxidative stabilities of the treated samples were investigated by thermogravimetric analysis: after the sol-gel treatment, the degradation mechanism was modified both in nitrogen and in air, and the improvement in the thermal stability was attributed to the presence of silica, which played a protective role in the degradation of the textile fabrics. Finally, we investigated the combustion behavior of the textile fabrics by cone calorimetry, measuring the time to ignition, the heat release rate, and the relative peak. The former was found to depend on the type of fabric; the latter generally evidenced a remarkable decrease for all of the treated samples, up to 35% compared to the neat counterparts. This indicated that the sol-gel treatments improved the flame retardancy of the PET/COT fabrics. This conclusion was also confirmed by limiting oxygen index tests, which evidenced burning kinetics changes in the presence of the silica coating.

show abstract

Preparation, testing and performance of a TiO2/polyester photocatalyst for the degradation of gaseous methanol

Cited by 57 publications

References 12 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

Synthesis variables effect on TiO2/polyester fabrics photoactivity and stability

Thermal stability and flame retardancy of polyester, cotton, and relative blend textile fabrics subjected to sol–gel treatments

Contact Info

Product

Resources

About