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.
Shreyas Pansambal; Suresh Ghotekar; Sunil Shewale; Keshav Deshmukh; Nilesh Barde; Pranav Bardapurkar
Abstract
Magnetically separable silica-coated cobalt ferrite (CoFe2O4@SiO2) magnetic nanoparticles (MNPs) were synthesized by sol-gel auto combustion method. Silica matrix was employed to minimize the agglomeration and coarsening of the MNPs. The structural and morphological properties of the as-prepared nanocatalyst ...
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Magnetically separable silica-coated cobalt ferrite (CoFe2O4@SiO2) magnetic nanoparticles (MNPs) were synthesized by sol-gel auto combustion method. Silica matrix was employed to minimize the agglomeration and coarsening of the MNPs. The structural and morphological properties of the as-prepared nanocatalyst were investigated using XRD, EDX, TEM-SAED, FTIR, XPS and VSM techniques. Furthermore, these nanoparticles were used as an efficient nanocatalyst for simple, swift and one-pot synthesis of 5-aryl-1,2,4-triazolidine-3-thione derivatives. The reaction steps include imine formation, cyclization, condensation and aromatization without use of any oxidizing or reducing reagents. The present methodology offers remarkable merits like shorter reaction time, mild reaction conditions, excellent yield, simplicity, safer reaction pathway, easy workup and recyclable catalyst without any significant loss in catalytic activity and can be used for large scale synthesis. Hence, the present study describing the synthesis of CoFe2O4@SiO2 nanoparticles by efficient sol-gel auto combustion method followed by the investigation of potent catalytic activities may be useful for nanochemistry research opening a new arena in this field.