Mehrdad Hajian; Mohammad Rostamizadeh; Federico Galli
Abstract
Catalysis for environmental remediation is becoming of paramount importance as industrial and urban activities multiply, and by-products contaminate soils and wastewater. Effluents from industrial and urban activities have led to many environmental problems involving water contamination. Here, we propose ...
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Catalysis for environmental remediation is becoming of paramount importance as industrial and urban activities multiply, and by-products contaminate soils and wastewater. Effluents from industrial and urban activities have led to many environmental problems involving water contamination. Here, we propose a new iron-incorporated metal-organic framework (MOF) photocatalyst to decontaminate water. The nanocatalyst was synthesized by the solvothermal method, and Fe was added to the structure as a promoter and active phase. In this study, we examined the degradation of methylene blue (MB) as a cationic azo dye. The nanocatalysts were characterized by XRD, FE-SEM, BET, NH3-TPD, and FTIR techniques. The results showed high crystallinity, a large specific surface area, and a uniform promoter distribution. At a pH = 9, a catalyst amount of 110 mg and an initial MB concentration in the effluent of 2 ppm resulted in the highest removal percentage (98 %). The kinetic analysis provided a quasi-first-order model that reasonably matched the experimental data (R2 = 95 %). The results verified the catalyst’s great capability for efficient and fast MB removal in 60 minutes of photocatalytic processing.
shima Amani; Mohammad Rostamizadeh; Ali Ghadimi
Abstract
In this study, zeolitic imidazolate framework (ZIF-8) nanocatalyst was synthesized by the thermal solvent method and doped by Fe species through wet impregnation technique. The nanocatalysts were applied for the degradation of Phenazopyridine Hydrochloride (PHP) through the heterogeneous Electro-Fenton ...
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In this study, zeolitic imidazolate framework (ZIF-8) nanocatalyst was synthesized by the thermal solvent method and doped by Fe species through wet impregnation technique. The nanocatalysts were applied for the degradation of Phenazopyridine Hydrochloride (PHP) through the heterogeneous Electro-Fenton (HEF) process. The nanocatalysts were characterized by XRD, BET-BJH, FT-IR, FE-SEM, TEM, and acidimetric-alkalimetric titration techniques. The results showed the high surface area (1335 m2g-1) and homogenous dispersion of Fe species. The influence of different operating conditions was investigated, including pH level, nanocatalyst concentration, applied current, and PHP concentration. The optimum conditions for the HEF system over the Fe-ZIF-8 nanocatalyst were pH=7, 0.2 g L-1 of the Fe-ZIF-8 nanocatalyst, 100 mA, and 10 ppm of PHP concentration, which resulted in 99% PHP removal. The developed nanocatalyst had high reusability for the PHP removal in the HEF process. The results confirm the high potential of ZIF-8 nanocatalyst for pharmaceutical wastewater treatment through the HEF process.
Mohammad Rostamizadeh; Soorena Gharibian; Samira Rahimi
Abstract
Pharmaceutical wastewaters have several negative effects on human health. This study reports heterogeneous and ultrasound assisted electro Fenton (HSEF) for efficient degradation of Phenazopyridine (PHP). The high silica zeolite socony mobil–5 (ZSM-5) nanocatalyst is synthesized by hydrothermal ...
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Pharmaceutical wastewaters have several negative effects on human health. This study reports heterogeneous and ultrasound assisted electro Fenton (HSEF) for efficient degradation of Phenazopyridine (PHP). The high silica zeolite socony mobil–5 (ZSM-5) nanocatalyst is synthesized by hydrothermal technique and impregnated with iron species (0.1Fe-ZSM-5). The surface and textural properties of the synthesized nanocatalyst were characterized by X-ray Diffraction (XRD), Transmission electron Microscopy (TEM) and N2 adsorption-desorption techniques. The nanocatalyst includes the high crystallinity (ca. 72.41 %), surface area (ca. 294.40 m2g-1) and uniform dispersion of Fe species. The optimum operating conditions of the HSEF system are pH= 7, applied current of 100 mA, 0.1Fe-ZSM-5 nanocatalyst concentration of 0.2 gL-1 and ultrasonic power of 600 WL-1 which result in the highest PHP removal efficiency. The high performance of the developed nanocatalyst in three consecutive runs confirms the reusability of the nanocatalyst. The results show that the HSEF system has a high capacity for the efficient removal of PHP without requiring long reaction time, high applied current and strict acidic conditions which candidates it for the industrial applications.