In this research, structural, magnetic properties and photocatalytic activity of cobalt ferrite spinel (CoFe2O4) nanoparticles were studied. The samples were characterized by X-ray powder diffraction (XRD), energy dispersive X-ray (EDX), scanning electron microscopy (SEM), transmission electronic microscopy (TEM), Brunauer–Emmett–Teller (BET), Fourier transform infrared spectroscopy (FTIR), and UV-visible diffused reflectance spectroscopy (DRS) analysis. The XRD analysis revealed the formation of the single-phase CoFe2O4 with a cubic structure that is annealed at 500–700 °C in 3 h. The optical band gap energy for CoFe2O4 was determined to be in the range of 1.57–2.03 eV. The effect on the magnetic properties of cobalt ferrites was analyzed by using a vibrating sample magnetometer (VSM). The particle size and the saturation magnetization of cobalt ferrite nanoparticles increased with increasing annealing temperature. The photocatalytic activity of CoFe2O4 nanoparticles was investigated by using rhodamine B dye under visible light. The decomposition of rhodamine B reached 90.6% after 270 min lighting with the presence of H2O2 and CF500 sample.
Fe-Cu materials were synthesized using the chemical plating method from Fe powder and CuSO4 5% solution and then characterized for surface morphology, composition and structure by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and X-ray diffraction (XRD), respectively. The as-synthesized Fe-Cu material was used for removal of phenol from aqueous solution by internal microelectrolysis. The internal electrolysis-induced phenol decomposition was then studied with respect to various parameters such as pH, time, Fe-Cu material weight, phenol concentration and shaking speed. The optimal phenol decomposition (92.7%) was achieved under the conditions of (1) a pH value of phenol solution of 3, (2) 12 h of shaking at the speed of 200 rpm, (3) Fe-Cu material weight of 10 g/L, (4) initial phenol concentration of 100.98 mg/L and (5) at room temperature (25 ± 0.5 °C). The degradation of phenol using Fe-Cu materials obeyed the second-order apparent kinetics equation with a reaction rate constant of k of 0.009 h−1L mg−1. The optimal process was then tested against real coking wastewater samples, resulting in treated wastewater with favorable water indicators. Current findings justify the use of Fe-Cu materials in practical internal electrolysis processes.
Than hoạt tính (M1) được chế tạo từ vỏ cây chùm ngây bằng cách biến tính bởi H3PO4 và Na2CO3, được sử dụng để loại bỏ ion Cu(II) khỏi dung dịch nước. Một số đặc điểm hóa lý của M1 đã được nghiên cứu bằng kỹ thuật kính hiển vi điện tử quét (SEM) và quang phổ tán xạ năng lượng (EDS). Ảnh hưởng của pH (2,0 - 6,0), thời gian hấp phụ (30 - 180 phút) và lượng chất hấp phụ (0,025 - 0,20 gam) đến hiệu quả hấp phụ Cu(II) của M1 cũng được nghiên cứu. Kết quả cho thấy, thời gian đạt cân bằng hấp phụ, giá trị pH và lượng chất hấp phụ tối ưu cho quá trình hấp phụ Cu(II) lần lượt là 120 phút, pH bằng 5 và 0,10 gam. Dung lượng hấp phụ cực đại của M1 là 95,24 mg/g, có nghĩa là M1 có thể hoạt động như một chất hấp phụ để loại bỏ khá dễ dàng Cu (II) khỏi dung dịch nước.
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