Enhanced sonocatalytic degradation of organic dyes from aqueous solutions by novel synthesis of mesoporous Fe3O4-graphene/ZnO@SiO2 nanocomposites

Abstract

FeO-graphene/ZnO@mesoporous-SiO (MGZ@SiO) nanocomposites was synthesized via a simple one pot hydrothermal method. The as-obtained samples were investigated using various techniques, as follows: scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), and specific surface area (BET) vibrating sample magnetometer (VSM), among others. The sonocatalytic activities of the catalysts were tested according to the oxidation for the removal of methylene blue (MB), methyl orange (MO), and rhodamine B (RhB) under ultrasonic irradiation. The optimal conditions including the irradiation time, pH, dye concentration, catalyst dosage, and ultrasonic intensity are 60min, 11, 50mg/L, 1.00g/L, and 40W/m, respectively. The MGZ@SiO showed the higher enhanced sonocatalytic degradation from among the three dyes; furthermore, the sonocatalytic-degradation mechanism is discussed. This study shows that the MGZ@SiO can be applied asa novel-design catalyst for the removal of organic pollutants from aqueous solutions.

Silkworm cocoon derived N, O-codoped hierarchical porous carbon with ultrahigh specific surface area for efficient capture of methylene blue with exceptionally high uptake: kinetics, isotherm, and thermodynamics

“…1 Water contamination caused by these industries has drawn more and more attention, since almost all dyes are poorly biodegradable or resistant to environmental conditions and, therefore, create major problems in the treatment of wastewater stemming from the dyeing industry. 2 Currently, various treatment methods including physical, chemical and biological schemes have been developed to remove dyes from wastewater, such as photocatalytic degradation, [3][4][5][6] electrochemical degradation, 7,8 photochemical degradation, 9,10 sonochemical degradation, [11][12][13] sonocatalytic degradation, 14,15 Fenton-like degradation, [16][17][18] photo-Fenton degradation, [19][20][21] advanced oxidation process, [22][23][24][25] electro-Fenton degradation 26,27 and adsorption. [28][29][30][31][32][33][34][35] Among those, adsorption is proven to be a potentially powerful technique for removing pollutants from contaminated aqueous media.…”

Hybrid Advanced Oxidation Processes Involving Ultrasound: An Overview

“…Furthermore, they also increase the number of cavitation bubbles by acting as nucleation sites. The presence of catalysts can increase the quantity of free radicals generated, thus enhancing the rate of degradation of organic pollutants [93,94,95,96,97,98,99,100,101,102,103,104,105]. An acoustic cavitation process is also useful to generate active catalysts.…”

MIL-101(Cr)–cobalt ferrite magnetic nanocomposite: synthesis, characterization and applications for the sonocatalytic degradation of organic dye pollutants

“…17 LuFeO 3 , 18 Fe 3 O 4 -graphene/ZnO@SiO 2 (ref. 19) and La-doped ZnO 20 have been studied for their sonocatalytic activity and utilized as sonocatalysts. However, their separation and reuse are still a challenge.…”