Synthesis, Characterization and Catalytic Activity of NiO-CoO-MgO Nano-Composite Catalyst

Abstract

The ternary NiO-CoO-MgO catalyst in three ratios 20:20:60, 25:25:50, and 30:30:40 for these component oxides respectively, were synthesized by co-precipitation method of their carbonates by addition of a precipitate agent in basic media, and then calcinated these carbonate to obtain of mixed oxides. The prepared catalysts were characterized by using Powder X-Ray Diffraction (PXRD), Fourier Infrared spectroscopy (FT-IR), and Atomic Force Microscopy techniques (AFM) were used for identification of the prepared catalysts. The result showed that the particle size of these catalyst ratios, were in the nano range and the smallest size was 25:25:50. The investigation of catalytic activity of prepared catalysts was done by photo decolorization of Celestine blue B dye from simulated industrial wastewaters in aqueous solution. The decolorization efficiency of dye reached 99.9% after irradiation time for 1 h. Study the effect of different reaction conditions such as the pH of the medium, the weight of semiconductor and temperature of mixture reaction were shown that the maximum degradation was observed in conditions at pH = 4, catalyst dosage = 0.08 g, and temperature = 303 K.

Adsorption of Malachite Green Oxalate Dye by CuCo₂O₄/MgO Spinel Oxide Nanocomposite

“…The heat of the reaction is positive, indicating that the adsorption process is an endothermic process, while the From the Isothermal models in Table 2 and thermodynamic values in Table 3, the removal mechanism of MGO dye was physical absorption because ΔG was negative as well. The isothermal models were not identical to the Langmuir model [36][37].…”

Fabrication of carbon nanotube (CNTs)/Co3O4-Ni3O4/Al2O3 nanocomposite catalyst and its application for photocatalytic removal of Celestine blue dye

“…Where the A0, At, is the initial and the final absorption of dye. The best ratio of the prepared CNTs composite catalyst was 6% CNTs which gives high efficiency for removal of dye approach to 99% as shown in Figure 8, this may be due to increasing of their surface area and porosity and increasing of active pore sitesand give the best distribution of these active sites [52].…”

إزالة صبغة الفوكسين القاعدية عن طريق الامتزاز على متراكب نانوي CuCo2O4 كسطح ماص نشط

“…Fig. 6 shows a sudden increase in the removal efficiency of dye at first five minutes after that shows a very slight rise in Re% from 10-120 minutes indicating that all the dye adhered to the active sites at the surface of the adsorbent at 5 minutes and it was the optimum contact time 27 .…”