Photostability of wool fabrics coated with pure and modified TiO2 colloids

Pakdel, Esfandiar; Daoud, Walid A.; Sun, Lu; Wang, Xungai

doi:10.1016/j.jcis.2014.10.032

Cited by 27 publications

(21 citation statements)

References 44 publications

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“…Positive holes react with water (H2O) producing HO • radicals, while electrons react with oxygen (O2) producing O2 •radicals, Equation 3 and Equation 2, respectively. Then, the produced hydroxyl and superoxide radicals decompose the organic compounds (CnOmH(2n-2m+2)) producing intermediate compounds that can be converted into carbon dioxide (CO2) and water, Equation 4 (Conceição et al 2017;Costa et al 2013;Daoud, Xin, and Zhang 2005;Haji et al 2014;Li et al 2014;Lima et al 2014;Montazer and Morshedi 2012;Pakdel et al 2014a;Pakdel et al 2014b;Pakdel, Daoud, and Wang 2013;Wu et al 2009).…”

Section: Photocatalytic Resultsmentioning

confidence: 99%

“…Heterogeneous photocatalysis is one of the most promising technologies due to the low cost, non-toxicity and reusability of the semiconductor photocatalyst, and the fact that the sun can be used as a source of radiation, which is an inexhaustible source and does not add costs to the process (Beydoun et al 1999;Pera-Titus et al 2004). The semiconductors commonly used to catalyse a wide range of chemical reactions include titanium dioxide (TiO2), zinc oxide (ZnO), zinc sulphide (ZnS), tungsten trioxide (WO3) and cadmium sulfide (CdS) (Abid et al 2017a;Abid et al 2017b;Beydoun et al 1999;Lima et al 2014;Montazer and Pakdel 2010;Pakdel et al 2014a;Pera-Titus et al 2004). TiO2 with a band gap energy ≈ 3.0-3.3 eV (Jovic et al 2015) has been established as one of the most promising photocatalyst in the degradation of organic compounds due to its physicochemical properties and high photoactivity when exposed to ultraviolet (UV) radiation (Abid et al 2017a;Haji et al 2014;Hashemikia and Montazer 2012;Jovic et al 2015;Lima et al 2014;Montazer and Morshedi 2014;Pakdel et al 2014a;Wu et al 2009).…”

Section: Introductionmentioning

confidence: 99%

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Sustainable Bleaching Process of Raw Cotton by TiO2 Light-Activated Nanoparticles

Barros

Conceição

Silva

et al. 2020

UPjeng

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Nanoparticles (NPs) of titanium dioxide (TiO2) are promising for the photocatalytic degradation of organic compounds, arising as an excellent alternative to conventional bleaching processes. Within this background, aqueous suspensions of TiO2 NPs were impregnated by the pad-dry method in raw cotton. The hydrophilic properties and whiteness index (WI) of Berger were the main parameters examined before and after the TiO2 treatment. In the absence of water, using a UV-Vis lamp, high hydrophilicity was found for raw cotton. Diversely, under UV-LED radiation, the presence of water molecules in the coated cotton was revealed to be a crucial parameter in enhancing its whiteness. A comparable WI of Berger with conventional bleaching methods was obtained using 0.5 g L-1 TiO2 suspension under UV-LED radiation, suggesting that the impregnation of TiO2 NPs can be a promising alternative for the industrial bleaching methods, as it proves to be more sustainable and with low operating costs.

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Section: Photocatalytic Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Sustainable Bleaching Process of Raw Cotton by TiO2 Light-Activated Nanoparticles

Barros

Conceição

Silva

et al. 2020

UPjeng

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“…A bluish 5% TiO2 colloid was synthesized through a low-temperature sol-gel method at 60 ºC by controlling hydrolysis and condensation reactions of titanium tetra isopropoxide (TTIP, 97 %) as reported in our previous works [11,[32][33][34]. The TiO2 colloid was prepared through adding 1.4% hydrochloric acid (HCl, 37%) to the mixture of TTIP, glacial acetic acid and deionized water at 60 ºC and refluxing for 2 h. Tetra ethyl orthosilicate (TEOS, 98%) was used as the precursor of silica.…”

Section: 2synthesis Of Nanoparticlesmentioning

confidence: 99%

“…When TiO2 is activated under UV ray with wavelength lower than 388 nm, it generates negative electrons and positive holes. The excited electrons and produced holes react with oxygen and water molecules to produce superoxide anions and hydroxyl radicals, respectively [8,10,11]. These products readily react with organic contaminants available in their surroundings and break them down into water and carbon dioxide [10].…”

Section: Introductionmentioning

confidence: 99%

Tunable photocatalytic selectivity of TiO 2 /SiO 2 nanocomposites: Effect of silica and isolation approach

Pakdel

Daoud

Seyedin

et al. 2018

Colloids and Surfaces A: Physicochemical and Engineering Aspect

Self Cite

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“…gadā [14]. Pēc tam publicēti vairāki raksti, kas apskata anatāza nanodaļiņu uznešanu (galvenokārt uz kokvilnas), lai gan tika veikti pētījumi arī vilnas [15], [16] un sintētisko šķiedru modificēšanā [17]. Par spīti tam, ka šajā jomā strādā daudzi zinātnieki no visas pasaules, nanodaļiņu sintēze principā ir nemainīga.…”

Section: A Pašattīrošu Audumu Izveide Pasaulēunclassified

Pašattīroši audumi: kas tie ir un kāpēc tādi nepieciešami?

Eglı̅tis

Mežinskis

Buiķe

2018

SJ MSAC

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Pašattīroši audumi ir tekstilmateriāli, kuriem piemīt spēja ārēju vides faktoru iedarbībā atbrīvot savu virsmu no dažādiem piesārņojumiem. Šādi audumi ļauj samazināt ūdens un enerģijas patēriņu, kas saistīts ar drēbju mazgāšanu, samazināt infekciju risku, pateicoties to biocīdām īpašībām, kā arī pasargā cilvēkus no UV starojuma. Papildus tam šādus audumus arī būtu grūtāk saslapināt; tas mūsdienu mitrajā klimatā samazinātu diskomfortu no salijušām drēbēm. Šādus efektus pašattīroši audumi iegūtu ar tādiem mehānismiem kā fotokatalīze un superhidrofobitāte. Lai audumi iegūtu augstāk minētās īpašības, piemērotākie ir ZnO un TiO2 nanodaļiņu veidotie pārklājumi. Savukārt pārklājumu ieguvei jāizmanto sola-gēla metode, kas sniedz iespēju izveidot homogēnus pārklājumus pie temperatūrām, kuras iztur organiskas dabas materiāli. Kopš 2011. gada ar šādu audumu izstrādi ir nodarbojies Rīgas Tehniskās universitātes Dizaina tehnoloģiju institūts. Kopš 2016. gada ar šādiem pārklājumiem nodarbojas arī Rīgas Tehniskās universitātes Silikātu materiālu institūtā. Izmantojot savas gadu desmitu laikā iegūtās zināšanas sola-gēla tehnoloģijā un nanostrukturētu pārklājumu ieguvē, sekmīgi uzsākti pētījumi rūpnieciski izmantojamu tehnoloģiju izstrādei kokvilnas audumiem.Self-Cleaning Fabrics: What Are They and How Are They Used?Self-cleaning fabrics are textile materials, which under the influence of various external environmental factors have the ability to rid their surface from various contaminants. Such fabrics make it possible to reduce water and energy consumption associated with washing clothes, to reduce the risk of infections due to their biocidal properties, and to protect people from UV radiation. In addition, such fabrics would also be more difficult to wet. This would reduce the possibility of wet clothes in damp climates. Such effects by self-cleaning fabrics could be achieved through mechanisms of photocatalysis and superhydrophobicity. To develop textiles with above mentioned properties, the most suitable approach is the deposition of coatings formed by ZnO and TiO2 nanoparticles. In turn, the sol-gel method should be used to obtain coatings. This would make it possible to create homogeneous coatings at temperatures that organic materials can withstand. Institute of Design Technologies, Riga Technical University, has been working on the development of such fabrics since 2011. The research in the field of such coatings at the Institute of Silicate Materials, Riga Technical University, has been performed since 2016. Thanks to decades long research in sol-gel technology and nanostructured coatings, the development of commercially available technologies for cotton fabrics has been successfully launched at the Institute of Silicate Materials.Keywords: self-cleaning fabrics, sol-gel method, TiO2, ZnO

show abstract

Photostability of wool fabrics coated with pure and modified TiO2 colloids

Cited by 27 publications

References 44 publications

Sustainable Bleaching Process of Raw Cotton by TiO2 Light-Activated Nanoparticles

Sustainable Bleaching Process of Raw Cotton by TiO2 Light-Activated Nanoparticles

Tunable photocatalytic selectivity of TiO 2 /SiO 2 nanocomposites: Effect of silica and isolation approach

Pašattīroši audumi: kas tie ir un kāpēc tādi nepieciešami?

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