Comparison of simple and economical photocatalyst immobilisation procedures

Lim, Leonard Lik Pueh; Lynch, R. J.; In, Su‐Il

doi:10.1016/j.apcata.2009.06.015

Cited by 54 publications

(34 citation statements)

References 30 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%

“…Thus, a binding agent is usually necessary for direct coating in order to form solid adhesion between catalyst and substrate. Either organic polymer or inorganic binding materials have been used for photocatalyst immobilization (Du et al, 2008;Lim et al, 2009;Henderson, 2011). However, the effect of binder amount on the PCO activity and stability of the coating is seldom discussed.…”

Section: Introductionmentioning

confidence: 99%

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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%

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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“…As solid support, different materials were investigated: natural or synthetic fabrics, polymer membranes, activated carbon, quartz, glass, glass fiber, optical fibers, pumice stone, zeolites, aluminum, stainless steel, titanium metal or alloy, ceramics (including alumina, silica, zirconia, titania), red brick, white cement etc. (Bideau et al, 1995, Rachel et al, 2002, Balasubramanian et al, 2004, Kemmitt et al 2004, Gunlazuardi and Lindu, 2005, Hunoh et al 2005, Chen et al, 2006, Medina-Valtierra et al, 2006, Gaya and Abdullah, 2008, Lim et al, 2009, Siew-Teng Ong et al, 2009, Hanel et al, 2010, Zita et al, 2011.…”

Section: )mentioning

confidence: 99%

“…In this sense, photocatalysis is a handy promising technology, very attractive for wastewater treatment and water potabilization (Nikolaki et al, 2006;Lim et al, 2009). Using titanium dioxide for water splitting after UV irradiation, it has been shown that this can encompass a wide range of reactions, especially the oxidation of organic compounds.…”

Section: )mentioning

confidence: 99%

“…Most attention has been given to TiO2 because of its high photocatalytic activity having a maximum quantum yields, its resistance to photo-corrosion, its biological immunity and low cost. There are two types of reactors: reactors with TiO2 suspended in the reaction medium and reactors with TiO2 fixed on a carrier material (Lim et al;2009, Mozia, 2010Li et al, 2009). A very promising method for solving problems concerning the separation of the photocatalyst from the reaction medium is the application of photocatalytic membrane reactors (PMRs), having other advantages such as the realization of a continuous process and the control of a residence time of molecules in the reactor (Mozia, 2010).…”

Section: )mentioning

confidence: 99%

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Waste Water Treatment Methods

Segneanu¹,

Orbeci²,

Lazău³

et al. 2013

Water Treatment

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High‐performance photocatalysts for the selective oxidation of alcohols to carbonyl compounds

Rangarajan

Yan

2020

Can J Chem Eng

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With an increase in awareness about the need for green chemistry, there is a shift in focus towards identifying eco-compatible technologies that can improve product yield and eliminate the use or generation of hazardous compounds. An immediate practical example of such an approach is the development of sustainable methods for alcohol oxidation as alternatives to the current processes that are energy intensive and rely on ecotoxic chemicals. In this regard, heterogeneous photocatalysis has been identified as a robust technique to catalyze reactions under benign conditions, which would otherwise require harsh synthesis routes. With the advent of materials sciences and nanotechnology, there has been a tremendous increase in the scope of applicability of photocatalysis in fine chemicals synthesis. Though an attractive choice, much of the fundamental information pertaining to catalyst activity, selectivity and reaction conditions for optimum conversion are still to be investigated for most of these systems. To this end, this review will encompass recent achievements in the selective photocatalytic oxidation of alcohols by harnessing solar radiation as a viable source of energy. The discussion will be arranged based on common types of photocatalysts reported in literature, namely metal oxides (eg, TiO 2 and ZnO, Nb 2 O 5), sulphides (eg, CdS, CuS, and Bi 2 S 3), and carbonaceous photocatalysts (eg, g-C 3 N 4). Several such candidates for photocatalysts will be discussed critically with the aim of providing useful insight into developing selective photocatalysts that can oxidize alcohols via eco-friendly pathways along with high yields.

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Comparison of simple and economical photocatalyst immobilisation procedures

Cited by 54 publications

References 30 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

Waste Water Treatment Methods

High‐performance photocatalysts for the selective oxidation of alcohols to carbonyl compounds

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