The results of a laboratory-scale study of an environmentally friendly water treatment method are presented, where the dyes in the industrial textile wastewater were removed by photocatalytic process. ZnO-TiO2 nanopar...The results of a laboratory-scale study of an environmentally friendly water treatment method are presented, where the dyes in the industrial textile wastewater were removed by photocatalytic process. ZnO-TiO2 nanoparticles as photocatalyst has been prepared via sol-gel technique. Several factors were studied in order to find the conditions that could be used to synthesize this photocatalyst for optimum degradation of Indigo Carmine dye in aqueous solutions. The optimum condition for preparation of ZnO-TiO2 mixed oxide are 1.5 TiO2/ZnO, 4 C2HsOH/TIP, 4 H20/TIP, 0.3 HNO3/TIP molar ratios, without aging, 550 ℃ calcination temperature for 5 hrs at which the surface area and the photocatalytic activity are 186.1 m^2/g and 96.1, respectively. Generally, the photocatalytic activity of the samples prepared by sol-gel technique is the highest activity. Details of the synthesis procedure and results of the characterization studies of the produced xerogel are presented in this paper.展开更多
Synthesis of ZnO nanoparticles by hydrothermal technique in presence of cetyltrimethylammonium bromide （CTAB） as surfactant was carried out by statistically designed experiments based on Box Behnken method. The mean...Synthesis of ZnO nanoparticles by hydrothermal technique in presence of cetyltrimethylammonium bromide （CTAB） as surfactant was carried out by statistically designed experiments based on Box Behnken method. The mean parameters, surfactant concentration, time and temperature have been studied to show their effect on ZnO particle size and morphology. The results of experimental design indicate that the surfactant concentration, reaction time and temperature were significant. ZnO particles were investigated using XRD and SEM and the findings show that ZnO nanoparticles were formed at 100 ℃ and their crystallinity were improved with temperature rise from 100 to 200 ℃. Particle size of ZnO in the range of 39-76 nm is achieved using this technique.展开更多
文摘The results of a laboratory-scale study of an environmentally friendly water treatment method are presented, where the dyes in the industrial textile wastewater were removed by photocatalytic process. ZnO-TiO2 nanoparticles as photocatalyst has been prepared via sol-gel technique. Several factors were studied in order to find the conditions that could be used to synthesize this photocatalyst for optimum degradation of Indigo Carmine dye in aqueous solutions. The optimum condition for preparation of ZnO-TiO2 mixed oxide are 1.5 TiO2/ZnO, 4 C2HsOH/TIP, 4 H20/TIP, 0.3 HNO3/TIP molar ratios, without aging, 550 ℃ calcination temperature for 5 hrs at which the surface area and the photocatalytic activity are 186.1 m^2/g and 96.1, respectively. Generally, the photocatalytic activity of the samples prepared by sol-gel technique is the highest activity. Details of the synthesis procedure and results of the characterization studies of the produced xerogel are presented in this paper.
文摘Synthesis of ZnO nanoparticles by hydrothermal technique in presence of cetyltrimethylammonium bromide （CTAB） as surfactant was carried out by statistically designed experiments based on Box Behnken method. The mean parameters, surfactant concentration, time and temperature have been studied to show their effect on ZnO particle size and morphology. The results of experimental design indicate that the surfactant concentration, reaction time and temperature were significant. ZnO particles were investigated using XRD and SEM and the findings show that ZnO nanoparticles were formed at 100 ℃ and their crystallinity were improved with temperature rise from 100 to 200 ℃. Particle size of ZnO in the range of 39-76 nm is achieved using this technique.
