Whiter, Brighter, and More Stable Cellulose Paper Coated with TiO₂/SiO₂ Core/Shell Nanoparticles using a Layer‐by‐Layer Approach

Abstract

To inhibit the photocatalytic degradation of organic material supports induced by small titania (TiO2 ) nanoparticles, four kinds of TiO2 nanoparticles, that is, commercial P25-TiO2 , commercial rutile phase TiO2 , rutile TiO2 nanorods and rutile TiO2 spheres, prepared from TiCl4 , were coated with a thin, but dense, coating of silica (SiO2 ) using a conventional sol-gel technique to form TiO2 /SiO2 core/shell nanoparticles. These core/shell particles were deposited and fixed as a very thin coating onto the surface of cellulose paper samples by a wet-chemistry polyelectrolyte layer-by-layer approach. The TiO2 /SiO2 nanocoated paper samples exhibit higher whiteness and brightness and greater stability to UV-bleaching than comparable samples of blank paper. There are many potential applications for this green chemistry approach to protect cellulosic fibres from UV-bleaching in sunlight and to improve their whiteness and brightness.

Facile Synthesis of Yolk–Shell Nanostructured Photocatalyst with Improved Adsorption Properties and Molecular‐Sieving Properties

“…However, TiO 2 often causes a problem regarding the destruction of the TiO 2 ‐applied surface under UV‐light irradiation, especially if it is supported on organic substrates (for example, organic binders, polymer films, and organic fibers), leading to a reduction of both the photocatalytic activity of TiO 2 and the durability of the support materials . A conventional approach to inhibit the self‐degradation of the TiO 2 ‐applied surface is covering the TiO 2 surface with an inert material such as carbon, hydroxyapatite, silica, or porous silica . A number of studies reported to date have commonly claimed that such methodology endows the TiO 2 photocatalyst with not only size selectivity but also an increased adsorption property in the photocatalytic degradation of specific organic molecules.…”

Nanocellulose: Recent advances and its prospects in environmental remediation

“…Besides, Puls et al [ 127 ] clarified that TiO 2 could cause pitting on the surface of cellulose acetate/cellulose pulp fibres under UV illumination. Therefore, cellulose nanomaterials need to be coated and covered perfectly by inert UV-absorbing materials in order to protect cellulosic fibres from UV bleaching [ 128 ].…”

Phenyl carbamate functionalized zinc oxide nanorods for paper-based thin film microextraction

“…Due to the merits of cellulose lter paper such as low cost, exibility, biocompatibility and good resistance in acidic or basic conditions, it is a good candidate to be used as TFME support. 10 Recently, modication of cellulose paper with different materials such as polydopamine, pheny isocyanate and aptamer were reported as a sorbent in microextraction techniques. [11][12][13] Up to now, several nanostructured metal oxides (e.g.…”