Abstract
This work establishes a simple method for synthesising layered double hydroxides (LDHs) powders with coprecipitation. The characteristics of the samples were investigated y X-ray diffraction (XRD), scanning electron microscopy (SEM) and spectrophotometer UV–Vis (DRS). Non-uniform distribution was shown for LDHs samples by SEM. Photocatalytic efficiencies were tested using methylene blue (MB) dye as a model contaminant under UV irradiation. In particular, Zn–Al-Ti LDH exhibited an excellent performance towards MB degradation compared with commercial TiO2 nanoparticles. Methylene blue removal percentage was reached at almost 100%, whereas commercial TiO2 reached a removal rate of only 66% under the same conditions within 20 min. The aim of the current work is to prepare Zn-Al-Ti layered double hydroxides nanocomposite and to evaluate their photocatalytic activity in the removal of methylene blue under UV irradiation.
Highlights
Over the past few decades, several researches focusing on photocatalysis have been investigated as an alternative method to eliminate the organic dye pollutant [1,2]
To bind the titanium oxide in the previous nanocomposite, a wet impregnation of TiO2 on Zn-Al layered double hydroxides (LDHs) was used for the preparation of Zn-Al-Ti LDH; diluted TiO2 suspension (3wt%) and 0.67 M of Na2CO3 basic solution are charged to the Zn-Al LDH calcined powder and removed in a stove at 100°C.The obtained sample was dried for 12 hours at 100 °C, calcined for 5 hours at 500 °C and denoted as Zn-Al-Ti LDH
LDHs samples and commercial TiO2 presented in fig. 1 were analyzed by X-ray diffraction (XRD)
Summary
Over the past few decades, several researches focusing on photocatalysis have been investigated as an alternative method to eliminate the organic dye pollutant [1,2]. Lamellar double hydroxides (LDH) were synthesized for the first time by Feitknecht [4]. Their development was amplified by the work of Miyata [5,6,7] on the [Zn3Al(OH)8][X. Enormousres researches have reported that LDH photocatalysts presented an effective removal performance of organic contaminants [11, 12]. Enormous LDH photocatalysts were reported that Zn-Ti LDH exhibited the highest photocatalytic performance in the degradation of organic pollutants [11, 13]
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