Activity in the Photodegradation of 4-Nitrophenol of a Zn,Al Hydrotalcite-Like Solid and the Derived Alumina-Supported ZnO

Abstract

A Zn,Al layered double hydroxide (LDH), with the hydrotalcite structure and the mixed oxide obtained upon its calcination at 650 °C, was tested in the adsorption and photocatalytic degradation of 4-Nitrophenol in aqueous solution. The Zn,Al LDH was fast and easily obtained by the coprecipitation method. Hydrothermal treatment under microwave irradiation was applied to compare the effect of the ageing treatment on the photocatalytic behavior. The efficiency of the synthetized solids was compared to that of a commercial ZnO. The ageing treatment did not improve the performance of the original samples in the degradation of 4-nitrophenol. The activity of the synthetized solids tested exceeded that observed for the reaction with commercial ZnO. The photocatalytic performance of the original non-calcined hydrotalcite is similar to that of commercial ZnO. The calcined hydrotalcite showed a better performance in the adsorption-degradation of the contaminant than ZnO, and its reusability would be possible as it recovered the hydrotalcite-like structure during the reaction.

Improvement of Congo Red Photodegradation Performance Through Zn/Al-TiO2 and Zn/Al-ZnO Preparation

“…Not a few studies on the degradation of organic pollutants catalyzed by Zn/Al LDH. Hydrothermal methods have been used in preparing Zn/Al-based catalysts, including Zn/Al-C 3 N 4 (Gandamalla et al, 2021) , Zn/Al-TiO 2 (Mourid et al, 2020) , Zn/Al-ZnO (Trujillano et al, 2020) , ZnBa/Al-ZnO (Elhalil et al, 2018) , Zn/Al-TiO 2 (Aoudjit et al, 2019) , Zn/Al-ZnO (Zhang et al, 2016) , and ZnCu/Al (Kim et al, 2017) as photocatalysts in the degradation of organic pollutants, respectively cipro oxacin, sulfamethoxazole, nitrophenol, ca eine, dodecyl sulphate, methylene blue, and orange II dyes.…”

Hybridization of layered double hydroxides with functional particles

“…The photocatalytic reactions examined using LDHs as photocatalysts include water splitting (and the OER and HER), degradation of organics, oxidation of As(III), etc. 112 Besides the photocatalytically active LDHs, photocatalytically inactive LDH (MgAl-LDH) was used as a support to immobilize photocatalytically active nanoparticles including TiO 2 , 112,113 ZnO, 114,115 BiOIO 3 , 149 and delta-Fe 2 O 3 . 111 Using the synthetic option E, the photocatalytically active nanoparticles were immobilized on the LDH with a controlled particle size and the spatial distribution suitable for efficient photocatalytic reactions (the structure type in Fig.…”

Microwave-assisted biosynthesis of flower-shaped ZnO for photocatalyst in 4-nitrophenol degradation

“…Degradation of 4-nitrophenol (4-NP) was utilized as a model reaction to evaluate the ZnO photocatalytic activity. When the catalyst was introduced to the 4-NP solution, 4-nitrophenol was deprotonated to 4-aminophenolat (4-AP) [30]. The characteristic band of the phenolate group at 400 nm was recorded using UV-Vis.…”