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

Abstract

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.

Optimization of the metakaolin geopolymer preparation for maximized ammonium adsorption capacity

“…However, also materials obtained from a reaction between alumino-silicate precursors and phosphoric acid are sometimes referred to as acid-activated geopolymers [3]. Geopolymers have recently gained interest in several water and wastewater treatment applications such as adsorbents [4][5][6][7][8][9][10][11], membrane material [12], photocatalysts [13,14], functional construction materials [15,16], or substrate for biofilm reactors [17]. In many of the aforementioned applications, the use of geopolymers is based on their ion exchange capacity and porous structure.…”

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

“…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].…”

Binders alternative to Portland cement and waste management for sustainable construction—part 1

“…75 Currently, researchers are studying MK-based geopolymers also to produce non-structural plasters with lightweight aggregates for thermal insulation, [105][106][107][108][109][110] and to be used as mortars able to adsorb volatile organic compounds (VOCs). [111][112][113][114][115] Another trend is to produce geopolymers suitable for refractory applications, adding a foaming agent, H 2 O 2 , or Al powder. 106,116,117 Results show that only Al-geopolymers are successfully converted to crack-free ceramics upon heating.…”

“…75 Currently, researchers are studying MK-based geopolymers also to produce non-structural plasters with lightweight aggregates for thermal insulation, 105–110 and to be used as mortars able to adsorb volatile organic compounds (VOCs). 111–115…”