High Efficient Photocatalytic Degradation of Methyl Orange Dye in an Aqueous Solution by CoFe₂O₄-SiO₂-TiO₂ Magnetic Catalyst

Abstract

This study successfully synthesized a core-shell-shell in the form of CoFe 2 O 4 -SiO 2 -TiO 2 catalyst magnetic and recyclable. The catalyst was employed for the photocatalytic degradation of methyl orange (MO) dye. Subsequently, the catalyst was subjected to XRD, FTIR, SEM-EDS, VSM, as well as UV-DRS characterizations. The photocatalytic degradation was studied as a function of the solution pH, MO concentration, and irradiation time, while the kinetics of photocatalytic degradation and the catalyst reusability were also evaluated. On the basis of the XRD, FTIR, and SEM-EDS characterizations, the CoFe 2 O 4 coating was successfully carried out using SiO 2 and TiO 2 . CoFe 2 O 4 -SiO 2 -TiO 2 was discovered to possess magnetic properties with a saturation magnetization of 17.59 emu/g and a bandgap value of 2.4 eV. The photocatalytic degradation of MO followed the Langmuir-Hishelwood model. The optimum degradation was obtained at the MO concentration of 25 mg/L, solution pH of 4, catalyst dose of 0.05 g/L, irradiation time of 160 minutes, MO removal efficiency achieved 93.46%. The regeneration study showed CoFe 2 O 4 -SiO 2 -TiO 2 after 5 cycles were able to catalyze the photocatalytic degradation with an MO removal efficiency of 89.96%.

Synthesis of NiFe2O4/SiO2/NiO Magnetic and Application for the Photocatalytic Degradation of Methyl Orange Dye under UV Irradiation

“…The level was not fully achieved, but it indicates the occurrence of the mineralization process [55]. For example, the TOC removal for phenol using CoFe2O4/SiO2/TiO2 in 120 minutes was 87%, and the TOC removal of paraquat after 180 minutes using N-doped TiO2@SiO2@Fe3O4 was 84.71% [35,55]. In this study, the initial and after-degradation TOC values were determined under optimum conditions: pH of 4, 0.5 g/L photocatalyst dose, methyl orange dye concentration of 10 mg/L, and irradiation time of 120 minutes.…”

“…Figure 7d shows that the greater the concentration of the dye, the smaller the degraded substance. Furthermore, the higher the concentration, the more it can interact with the active surface of the catalyst, but this condition prevents the penetration of light [35]. The smallest value of C/C0 was obtained from 10 mg/L of methyl orange with degradation efficiency of 95.76%.…”

“…The higher the pH, the more the hydroxide ions (OH‫,)-‬ which causes competition between the dye and hydroxide ions. Another study reported that the highest degradation efficiency for methyl orange dye occurred at a pH of 4 using CoFe2O4/SiO2/TiO2 [35].…”

“…Another study reported that Fe3O4 coated with SiO2 and TiO2 as the outer thin layer could degrade methylene blue and ciprofloxacin dyes by 95% within 90 minutes [34]. SiO2 can also protect ferrite compounds from agglomeration [35].…”

Кінетика Окиснювальної Деградації Метилового Оранжевого З Використанням Процесу “Сонопероксат”

“…Азобарвники становлять понад 50 % від усієї номенклатури синтетичних барвників [2]. Найчастіше для деградації азобарвників використовують такі передові процеси окиснення, як фотокаталіз [3][4][5][6][7][8][9][10][11][12], процес Фентона та Фентон-подібні процеси [13,14].…”