Abstract
ABSTRACT Immobilizing the photocatalyst on a support is an alternative solution to a critical issue in photocatalysis, which is the need for unit operations to remove the photocatalyst from the effluent. In this work, TiO2 was immobilized onto a cotton textile substrate by polycarboxylic acid binders (succinic and citric acids) using a solution deposition method, and the most appropriate conditions for pre-treatment and the relationship between variables were determined by an experimental design. Then, samples prepared at optimum conditions were exposed to UV for an extended period of time to evaluate the deactivation. The results showed an increase in photocatalytic activity and deposited mass by raising curing temperature, a statistically significant variable for tested binders. However, the increase in photocatalyst mass deposition is not always followed by an increase in photocatalytic activity, indicating that the photocatalyst distribution on the substrate is also important for photocatalytic efficiency. Both binders formed UV light active materials with sufficient displacement strength for photocatalysis use.
Highlights
TiO2-based photocatalysis has been widely studied in recent years due to the many advantages TiO2 presents as a photocatalyst
A photoactivity test for photocatalysts immobilized on glass, as proposed in the literature, was adapted for use on textile substrates
The treatments were compared by the deposited photocatalyst mass on the samples
Summary
TiO2-based photocatalysis has been widely studied in recent years due to the many advantages TiO2 presents as a photocatalyst. Efforts have focused mainly on researching its most effective application in the degradation of organic pollutants in the liquid phase (Herrmann, 1999; Li et al, 2014; Padovan and Azevedo, 2015; Zangeneh et al, 2015; Abid et al, 2016; Tang et al, 2016; Grčić et al, 2017) and gas phase (Verbruggen, 2015), or as an antibacterial agent (Mccullagh et al, 2007). The remarkable features of TiO2 as a photocatalyst and the increasing concern over the effects of water. In this sense, nano-titanium dioxide films deposited on solid supports present major benefits for these photocatalytic applications when compared to the commonly used powder morphologies. Lansarin the operation in a slurry system requires additional unit operations to remove the photocatalyst from the effluent
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