Mixed oxides derived from layered double hydroxides as novel catalysts for phenol photodegradation

5th ModTech International Conference - Modern Technologies in Industrial Engineering

Puscasu, C.M.^1 ; Carja, G.^1 ; Mureseanu, M.^2 ; Zaharia, C.^1

Gheorghe Asachi Technical University of Iasi, Faculty of Chemical Engineering and Environmental Protection, 73 Prof.Dr.Docent D.Mangeron Blvd, Iasi

700050, Romania^1

University of Craiova, Faculty of Chemistry, 107-I Calea Bucureti, Craiova

200585, Romania^2

关键词: Coprecipitation method;    Cost effective removal;    Environmental researches;    Environmental-friendly;    Layered double hydroxides;    Naturally occurring;    Phenol photodegradation;    Photocatalytic process;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/227/1/012105/pdf
DOI  :  10.1088/1757-899X/227/1/012105

来源: IOP

【 摘 要 】

The removal of organic pollutants is nowadays a very challenging aspect of the environmental research. There are strong interests to develop novel semiconducting photocatalysts able to efficiently promote advanced oxidation reactions. The development of photocatalysts based on the mixtures of mixed oxides derived from layered double hydroxides (LDHs) - a family of naturally occurring anionic clays - might offer novel environmental-friendly solutions for the cost effective removal of organic pollutants. This work presents ZnO/ZnAl2O4, ZnO/Zn2TiO4and ZnO/ZnCr2O4as novel photocatalytic formulations for phenol degradation under UV irradiation. They were obtained by the controlled thermal treatment of the layered double hydroxides matrices (LDHs), as precursors materials, type ZnM-LDH (M = Al3+, Cr3+or Ti4+). The LDHs were synthesized by the co-precipitation method at a constant pH. Controlled calcination at 650°C gives rise to solutions of mixed metal oxides. The structural and nanoarchitectonics characteristics of the studied catalysts were described by: XRD, SEM/TEM and TG/DTG techniques. Results show that in the photocatalytic process of the phenol degradation from aqueous solutions, ZnO/ZnCr2O4and ZnO/ZnAl2O4showed the best performance degrading ∼98% of phenol after 3.5 hs and 5 hs, respectively; while ZnO/Zn2TiO4has degraded almost 80 % after 7.5 hs of UV irradiation. These results open new opportunities in the development of new cost effective photoresponsive formulations able to facilitate the photo-degradation of the organic pollution as "green" solution for removal of dangerous pollutants.