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Eco-Friendly Manufacturing of Nano-TiO2 Coated Cotton Textile with Multifunctional Properties
Mirele Horsth de Paiva Teixeira,Luís Antônio Lourenço,Wagner Artifon,Celso Junior de Castro Vieira,Sergio Yesid Gómez González,Dachamir Hotza 한국섬유공학회 2020 Fibers and polymers Vol.21 No.1
In this work, multifunctional cotton fabrics were developed by immobilizing TiO2 nanoparticles (TiO2-NPs) usingan eco-friendly bath through a highly-scalable technique. The effects of TiO2-NPs, cross-linking agent, catalyst and curingtemperatures were assessed by analysis of variance and surface response methodology. The results disclose an excellentperformance of treated textiles for various applications: flame-retardant (char content enhanced by 1000 %), photocatalyticdecontamination (>90 % of contaminant abatement and feasibility for multiple reuses), self-cleaning of intense stains (up to80 % of stain vanishing), bacterial inhibition without TiO2 UV-activation (≈25 % of bacteria growth reduction). Moreover,those properties were durable for at least five domestic laundering cycles.
Enhanced CO2 capture by cupuassu shell-derived activated carbon with high microporous volume
Cruz Orlando F.,Campello-Gómez Ignacio,Casco Mirian E.,Serafin Jarosław,Silvestre-Albero Joaquín,Martínez-Escandell Manuel,Hotza Dachamir,Rambo Carlos R. 한국탄소학회 2023 Carbon Letters Vol.33 No.3
Here, we report the preparation of microporous-activated carbons from a Brazilian natural lignocellulosic agricultural waste, cupuassu shell, by pyrolysis at 500 ºC and KOH activation under different experimental conditions and their subsequent application as adsorbent for CO2 capture. The effect of the KOH:precursor ratio (wt/wt%) and the activation temperature on the porous texture of activated carbons have been studied. The values of specific surface area ranged from 1132 to 2486 m2/g, and the overall micropore volume ranged from 0.73 to 1.02 cm3/g. Carbons activated with 2:1 ratio of KOH and activation temperature of 700 ºC presented a CO2 adsorption at 1 bar of 7.8 and 4.4 mmol/g at 0 °C and 25 ºC, respectively. The isosteric heat of adsorption, Qst , was calculated for all samples by applying the Clausius–Clapeyron approach to CO2 adsorption isotherms at both temperatures. The values of CO2 adsorption capacities are among the highest reported in the literature, especially for activated carbons produced from biomass.