Synthesis of titania/activated carbon composites for the synergistic adsorption and photocatalysis of lindane in aqueous solutions DOI Creative Commons

Αnastasia Stavrinou,

Μαρία Θεοδωροπούλου, Christos D. Tsakiroglou

et al.

Environmental Science and Pollution Research, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 25, 2025

Abstract Lindane (LIND) is an organochlorine pesticide, belonging to the persistent organic pollutants (POPs), which are bioaccumulative with detrimental effects on human health and environment. In present work, activated carbon (AC) produced from coffee waste after activation sodium hydroxide (NaOH) pyrolysis at 800 °C (CWAC-NaOH-800) tested as adsorbent of LIND, substrate for synthesis hybrid adsorbent/photocatalytic materials titanium oxide (TiO 2 /AC) via sol–gel method, aiming synergistic adsorption photocatalysis LIND. Three different TiO /AC were synthesized mass ratio AC equal 2.0 (material /AC-0.2), 4.0 /AC-0.1), 8.0 /AC-0.05). As increases, specific surface area total pore volume composite decrease, meso-/macro-porosity reduced a pore-and-throat microporous network created within agglomerates nanoparticles. The LIND onto CWAC-NaOH-800 pH-independent follows Langmuir model maximum capacity 9.74 mg/g. mechanism likely be hydrophobic interactions generally ACs tend repel water molecules preferentially adsorb non-polar or compounds such transfer multi-compartment was used describe sorption dynamics in /AC-0.1, by accounting film/pore/surface diffusion instantaneous linear sorption, it found that contribution fraction microporosity enhanced presence , due decrease meso-/macro-porosity. For study adsorptive-photocatalytic materials, two experimental setups compared: ultraviolet-A (UVA) oven LEDs (power = 22 W, λ 375 nm) radiating periphery center reactor, UVA lamp 6 radially reactor walls. material /AC-0.1 showed comparable photocatalytic performance better than nanoparticles, “co-adsorption” effect. During adsorption-photocatalysis process, TOC removal efficiency reached 90% 3 h photocatalysis, indicative situ regeneration material. From inverse modeling experiments, kinetic constant photocatalyst highest setup lamp, showing good balance between adsorptive capacity. Graphical abstract

Language: Английский

Synthesis of titania/activated carbon composites for the synergistic adsorption and photocatalysis of lindane in aqueous solutions DOI Creative Commons

Αnastasia Stavrinou,

Μαρία Θεοδωροπούλου, Christos D. Tsakiroglou

et al.

Environmental Science and Pollution Research, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 25, 2025

Abstract Lindane (LIND) is an organochlorine pesticide, belonging to the persistent organic pollutants (POPs), which are bioaccumulative with detrimental effects on human health and environment. In present work, activated carbon (AC) produced from coffee waste after activation sodium hydroxide (NaOH) pyrolysis at 800 °C (CWAC-NaOH-800) tested as adsorbent of LIND, substrate for synthesis hybrid adsorbent/photocatalytic materials titanium oxide (TiO 2 /AC) via sol–gel method, aiming synergistic adsorption photocatalysis LIND. Three different TiO /AC were synthesized mass ratio AC equal 2.0 (material /AC-0.2), 4.0 /AC-0.1), 8.0 /AC-0.05). As increases, specific surface area total pore volume composite decrease, meso-/macro-porosity reduced a pore-and-throat microporous network created within agglomerates nanoparticles. The LIND onto CWAC-NaOH-800 pH-independent follows Langmuir model maximum capacity 9.74 mg/g. mechanism likely be hydrophobic interactions generally ACs tend repel water molecules preferentially adsorb non-polar or compounds such transfer multi-compartment was used describe sorption dynamics in /AC-0.1, by accounting film/pore/surface diffusion instantaneous linear sorption, it found that contribution fraction microporosity enhanced presence , due decrease meso-/macro-porosity. For study adsorptive-photocatalytic materials, two experimental setups compared: ultraviolet-A (UVA) oven LEDs (power = 22 W, λ 375 nm) radiating periphery center reactor, UVA lamp 6 radially reactor walls. material /AC-0.1 showed comparable photocatalytic performance better than nanoparticles, “co-adsorption” effect. During adsorption-photocatalysis process, TOC removal efficiency reached 90% 3 h photocatalysis, indicative situ regeneration material. From inverse modeling experiments, kinetic constant photocatalyst highest setup lamp, showing good balance between adsorptive capacity. Graphical abstract

Language: Английский

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