Incorporation of photoactive TiO2 in an aluminosilicate inorganic polymer by ion exchange

Gasca-Tirado, José Ramón; Manzano-Ramı́rez, A.; Villaseñor‐Mora, Carlos; Muñiz-Villarreal, M.S.; Zaldívar-Cadena, A.A.; Rubio-Ávalos, J.C.; Amigó, V.; Nava, R.

doi:10.1016/j.micromeso.2011.11.026

Cited by 52 publications

(33 citation statements)

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“…To date TiO 2 , with a bandgap of 3.03 eV, has been the most commonly used semiconductor for photo-induced reactions although its bandgap is slightly too large to make efficient use of the visible solar spectrum. Photocatalysts consisting of TiO 2 supported on a variety of substrates have been reported [2][3][4][5][6][7], including a photoactive composite with a metakaolin-based geopolymer prepared by ion exchange with solutions of (NH 4 ) 2 TiO(C 2 O 4 ) 2 ÁH 2 O, resulting in the insertion of TiO 2 particles (anatase) into the geopolymer [8]. A metakaolin geopolymer containing TiO 2 inserted by an ion exchange process is reported to efficiently photodegrade a model volatile organic compound (2-butanone) [9].…”

Section: Introductionmentioning

confidence: 99%

Novel photoactive inorganic polymer composites of inorganic polymers with copper(I) oxide nanoparticles

et al. 2015

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Novel photoactive composites of cubic Cu 2 O nanoparticles with aluminosilicate geopolymers were prepared and their structure was shown by SEM/EDS and TEM. XRD, FTIR, 27 Al and 29 Si MAS NMR to consist of a well-reacted geopolymer matrix containing homogeneously dispersed Cu 2 O nanoparticles. Under dark conditions, both the geopolymer matrix and the composites were shown to adsorb a model organic compound (methylene blue, chosen for its colour stability at high pH) by a process which follows pseudo-first-order kinetics and can be described by Langmuir-type isotherms. At concentrations [20 wt%, the oxide decreases the adsorption rate by blocking the active adsorption sites of the geopolymer. Under UV radiation, the composites remove the methylene blue by a combination of adsorption and photodegradation, without deterioration of the geopolymer structure or the photoactive Cu 2 O component, as evidenced by 63 Cu NQR spectroscopy, suggesting that these geopolymer composites should function as useful new materials for the removal of organic pollutants from water or the atmosphere.

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Section: Introductionmentioning

confidence: 99%

Novel photoactive inorganic polymer composites of inorganic polymers with copper(I) oxide nanoparticles

et al. 2015

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“…The reduction in pore width and the increase in specific surface in comparison with a non ion-exchanged geopolymer settle that TiO 2 particles growth inside the geopolymer [5]. TiO 2 particles were set in small cluster of 10 nm in width as shown by TEM, Fig.…”

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confidence: 80%

“…Ion-exchanged geopolymer synthesis: The geopolymers were treated with an aqueous solution of (NH4)2 TiO(C2O4)2 · H2O (ammonium titanyl oxalate Monohydrate). Samples were dried to obtain geopolymer with a reactive surface of 170 cm2 (4 ~ 42.5 cm2 [5]). Characterization of the IEG: Specific surface (S), pore volume (V) and pore width (D) of the synthesized IEG were determined by nitrogen adsorption on a NOVA 2000e Quantachrome.…”

Section: Methodsmentioning

confidence: 99%

“…They are synthesized at low temperatures by chemical reaction between aluminosilicates and alkaline polisilicates [1]. Their applications are wide; including the immobilization of toxic and radioactive waste [2,3], support for catalytic materials [4,5] and adsorber for volatile organic compounds (VOC) as formaldehyde [6]. VOC's are human-made and naturally occurring chemical compounds that stand high on the list of the pollutants detected in indoor atmospheres [7,8].…”

Section: Introductionmentioning

confidence: 99%

“…Resultant electron-hole pair can oxidize directly the adsorbed-VOC or may give rise, in combination with other chemical substances, to the formation of highly reactive species to degrade them finally [12]. In this paper, it is shown how an ion-exchanged geopolymers (IEG) [5] can be used to reduce indoor and outdoor air pollution by photolysis of VOC's. Different 2-Butanone concentrations were studied in the batch reactor under dry and humid conditions and followed by gas chromatography.…”

Section: Introductionmentioning

confidence: 99%

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Ion-exchanged geopolymer for photocatalytic degradation of a volatile organic compound

et al. 2014

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ElsevierGasca-Tirado, J.; Manzano-Ramirez, A.; Vazquez-Landaverde, PA.; Herrera-Diaz, EI.; Rodriguez-Ugarte, ME.; Rubio-Avalos, JC.; Amigó Borrás, V.... (2014) AbstractIn the present work it is shown how geopolymers can be used to control indoor and outdoor air pollution by photolysis of 2-Butanone as a Volatile Organic Compound (VOC). An ion exchange procedure was followed to incorporate TiO2 into a geopolymer (IEG), and different 2-Butanone concentrations were used in a batch reactor under dry and humid conditions. Variation on 2-Butanone concentration was followed by gas chromatography. A Langmuir-Hinshelwood model was used to determine the disappearance rate of reactant at the initial stage of the reaction.

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Inorganic Polymers (Geopolymers)

MacKenzie

2017

Encyclopedia of Polymer Science and Technology

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Geopolymers are ceramic-like inorganic polymers produced at low temperature, generally below 100 °C. They consist of chains or networks of mineral molecules linked with covalent bonds. The raw materials are mainly minerals of geological origin, hence the name "geopolymer". They comprise several molecular units for example: silico-oxide (Na,K)-(-Si-O-Si-O-) for (Na,K)-poly(silicate) or (Na,K)-poly(siloxonate), silico-aluminate (Na,K)-(-Si-O-Al-O) for (Na,K)poly(sialate), ferro-silico-aluminate (Na,K)-(-Fe-O-Si-O-Al-O-) or (Na,K)-poly(ferro-sialate), alumino-phosphate (-Al-O-P-O-) for poly(alumino-phosphate), formed in a geopolymerization process. We focus here on the reactivity of calcined kaolinite, an aluminosilicate oxide Si 2 O 5 Al 2 O 2 , metakaolin, which led to the discovery of geopolymers 40 years ago. A distinction is made between two synthesis routes: alkaline medium (Na+, K+, Li+, Ca++, Cs+ and the like) and acidic milieu (phosphoric acid, organic carboxylic acids). The alkaline route is the most important, so far. NMR spectroscopy provides data on the molecular structure and polymeric character. The geopolymerization mechanism starts with polycondensation of oligomers into small ribbon-like molecules. This intermediary stage involves several Si-OH groups together with H 2 O molecules. It is referred to as NASH or KASH by some cement scientists and generalized to the final geopolymer structure. The poly(sialate) final structure consists of well-polymerized individual elementary nanoparticles of 5 to 40 nm in size.

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Incorporation of photoactive TiO2 in an aluminosilicate inorganic polymer by ion exchange

Cited by 52 publications

References 13 publications

Novel photoactive inorganic polymer composites of inorganic polymers with copper(I) oxide nanoparticles

Novel photoactive inorganic polymer composites of inorganic polymers with copper(I) oxide nanoparticles

Ion-exchanged geopolymer for photocatalytic degradation of a volatile organic compound

Inorganic Polymers (Geopolymers)

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