Composite materials based on active carbon/TiO 2 for photocatalytic water purification

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22310%2F19%3A43918167" target="_blank" >RIV/60461373:22310/19:43918167 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/60461373:22350/19:43918167

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S0920586118310721?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0920586118310721?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.cattod.2019.01.010" target="_blank" >10.1016/j.cattod.2019.01.010</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Composite materials based on active carbon/TiO 2 for photocatalytic water purification

Popis výsledku v původním jazyce

The present work describes the preparations of active carbon (AC) – titania composites with different AC/TiO 2 ratio, their characterization using XRD, BET and SEM and evaluation of adsorption capacity and photocatalytic activity in aqueous solution using azo-dye Acid Orange 7 (AO7). Composite materials based on AC/TiO 2 were prepared from commercial active carbon (1737 m 2 g -1 ) and TiO 2 (P25, 45 m 2 g -1 ) materials by the mixing method. The studied parameters were the ratio of AC/TiO 2 , hydrothermal treatment and milling of as-prepared composites. The composites show increased BET surface area proportional to the content of AC in the material. The disappearance of AO7 is due to the combination of two processes, e. g. adsorption and photocatalytic oxidation which take place in parallel. Thus the overall removal of AO7 has been corrected on adsorption (measured in dark) to obtain the rate of AO7 disappearance due to photocatalytic oxidation (PO). The optimum ratio of AC/TiO 2 was found to be 0.23 where PO rate is only slightly lower than that for P25 and overall AO7 removal is twice higher than for P25 itself. The less intensive (low-frequency) milling of the composite results in the decrease of carbon particle size, increase in AO7 adsorption and decline in the PO of AO7. More intensive milling (high-frequency) results in the decrease of the anatase content, appearance of the small amount of brookite and almost negligible PO rate of AO7. Irradiation of low-frequency milled AC/TiO 2 composite in aqueous suspensions resulted in the generation of a comparable concentration of hydroxyl radical spin-adduct ( [rad] DMPO−OH) as non-milled composite, high-frequency milled composite revealed substantially lower [rad] DMPO−OH concentration which can be explained by the increased concentration of carbon-centered radicals in AC acting as scavengers of photogenerated electrons. © 2019 Elsevier B.V.

Název v anglickém jazyce

Composite materials based on active carbon/TiO 2 for photocatalytic water purification

Popis výsledku anglicky

The present work describes the preparations of active carbon (AC) – titania composites with different AC/TiO 2 ratio, their characterization using XRD, BET and SEM and evaluation of adsorption capacity and photocatalytic activity in aqueous solution using azo-dye Acid Orange 7 (AO7). Composite materials based on AC/TiO 2 were prepared from commercial active carbon (1737 m 2 g -1 ) and TiO 2 (P25, 45 m 2 g -1 ) materials by the mixing method. The studied parameters were the ratio of AC/TiO 2 , hydrothermal treatment and milling of as-prepared composites. The composites show increased BET surface area proportional to the content of AC in the material. The disappearance of AO7 is due to the combination of two processes, e. g. adsorption and photocatalytic oxidation which take place in parallel. Thus the overall removal of AO7 has been corrected on adsorption (measured in dark) to obtain the rate of AO7 disappearance due to photocatalytic oxidation (PO). The optimum ratio of AC/TiO 2 was found to be 0.23 where PO rate is only slightly lower than that for P25 and overall AO7 removal is twice higher than for P25 itself. The less intensive (low-frequency) milling of the composite results in the decrease of carbon particle size, increase in AO7 adsorption and decline in the PO of AO7. More intensive milling (high-frequency) results in the decrease of the anatase content, appearance of the small amount of brookite and almost negligible PO rate of AO7. Irradiation of low-frequency milled AC/TiO 2 composite in aqueous suspensions resulted in the generation of a comparable concentration of hydroxyl radical spin-adduct ( [rad] DMPO−OH) as non-milled composite, high-frequency milled composite revealed substantially lower [rad] DMPO−OH concentration which can be explained by the increased concentration of carbon-centered radicals in AC acting as scavengers of photogenerated electrons. © 2019 Elsevier B.V.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10402 - Inorganic and nuclear chemistry

Projekt

<a href="/cs/project/LTACH17007" target="_blank" >LTACH17007: Kompozitní fotokatalyzátory na bázi TiO2 - aktivní uhlí pro čištění vody a vzduchu</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2019

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Catalysis Today

ISSN

0920-5861

e-ISSN

—

Svazek periodika

328

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

5

Strana od-do

178-182

Kód UT WoS článku

000461462200027

EID výsledku v databázi Scopus

2-s2.0-85059948142