Nanoparticles of copper oxide on layered double hydroxides and the derived solid solutions as wide spectrum active nano-photocatalysts

Effect of basicity on the catalytic properties of Ni-containing hydrotalcites in the aerobic oxidation of alcohol

“…In the 400～1000 cm -1 region there are some bands related to vibrations of cation-oxygen. The broaden appearance at 616 and 566 cm -1 and the shift at 809 cm -1 (the lattice vibration modes of Me-O in the LDH sheets) clearly indicate that introduction of Mg 2+ into NiAl hydrotalcites resulted in a disordered cation distribution, which is also verified by the appearance of the shoulder peak at 1475 cm -1 [55,56]. water and interlayer water, whereas the latter can be put down to the dehydration of hydroxyl groups on the brucite layers and also the loss of CO 2 from the interlayer.…”

The photocatalytic property for water splitting and the structural stability of CuMgM layered double hydroxides (M=Al, Cr, Fe, Ce)

“…Particularly, when the Mg or Al element in the octahedral structure was replaced by other metal elements such as Zn, Cu and Ti, it would narrow the energy gap, enable the electrons being excited easily by visible light to create the electronhole pair and therefore increase the photo-catalysis activity (Wang and O'Hare, 2012;Xia et al, 2014). Due to the growing interest in LDHs for photocatalysis, many researchers paid attention to the adjustment variations of metal cations in the hydroxide layer, because of the specific structure and good catalytic property of the copper atom, thus the copper-containing LDHs and their derivatives are widely used in various catalytic reactions (Bridier et al, 2010(Bridier et al, , 2011Barrabes et al, 2011;Tian et al, 2012;Carja et al, 2013;Nishimura et al, 2013). However, because of the electron configuration of Cu 2+ : d 9 , (t 2g ) 6 (e g ) 3 , the structure of Cu(OH) 6 octahedra would be affected by the Jahn-Teller effect.…”

Aplicación del hidróxidos dobles laminares de ZnCuAl modificados con SDS como fotocatalizadores para el tratamiento eficiente de agua contaminada con compuestos orgánicos

“…Al ser sometidos a tratamiento térmico, los hidróxidos dobles laminares sufren un proceso de deshidroxilación, convirtiendo los hidróxidos que los conforman en sus respectivos óxidos mixtos, los cuales han mostrado ser fotocatalizadores activos en reacciones de degradación de contaminantes orgánicos en medio acuoso [3][4][5][6][7][8]. Particularmente en el área de fotocatálisis se ha prestado especial atención a los hidróxidos dobles laminares de ZnAl, debido a que a través de su calcinación es posible obtener óxido de zinc, que junto con el óxido de titanio se encuentran entre los fotocatalizadores mayormente reportados en la literatura [9][10][11][12][13][14][15][16][17][18], aunque otros sistemas en donde se incluye metales como Ni y Cu han sido estudiados obteniendo excelentes resultados [19].…”