A new copper-supported zinc ferrite as a heterogeneous magnetic nanocatalyst for the synthesis of bis(pyrazolyl)methanes and oxidation of sulfides

Abstract

In this paper, we report the synthesis of ZnFe2O4@SiO2@APTES@DHBS-Cu as a novel magnetic nanocatalyst, in a mild and green environment. The structure of the described magnetic compound was characterized by different physicochemical techniques including XRD, EDS, AAS, SEM, FT-IR, X-ray elemental mapping, TGA, and VSM analyses. The prepared magnetic nanoparticles exhibit excellent catalytic activity in synthesizing bis (pyrazolyl)methanes and oxidation of sulfide derivatives under green conditions. The heterogeneous nature of the catalyst was confirmed via the hot filtration experiment. Further, ZnFe2O4@SiO2@APTES@DHBS-Cu showed high efficiency and reusability that could be reused for at least five consecutive runs.

Fe3O4@SiO2@CSH+VO3− as a novel recyclable heterogeneous catalyst with core–shell structure for oxidation of sulfides

“…The TGA curve reveals several stages of weight reduction. Approximately 2% of weight loss is observed in the region of 30–200 °C, which can be attributed to the removal of organic solvents and moisture absorbed in the nanocatalyst structure 20 , 58 . A 10% weight loss, attributed to organic groups such as chitosan and inorganic groups such as vanadium attached to the surface of iron nanoparticles, occurs in the temperature range of 200–400 °C 59 .…”

Fe3O4@SiO2@CS.HCl.VO3 as A Novel Recyclable Heterogeneous Catalyst with Core-Shell Structure for Oxidation of Sulfides

“…About 2% weight losing is lost in the region of 200 − 30°C, which is related to organic solvents and moisture absorbed in the nanocatalyst structure. 20,50 10% weight loss related to organic groups such as chitosan and inorganic groups such as vanadium attached to the surface of iron nanoparticles occurs from 200 to 400°C. 51 Also, in the temperature range of 400 to 1000°C, the weight loss of 4% can be the result of the decomposition of the structure of silanized nanoparticles.…”

Simple Synthesis of Novel Cr-EDTA-MOF: A Green, Reusable, and Versatile Catalyst for the Production of Biodiesel Fuel from Oleic Acid and Palmitic Acid

“…Reduction in fuel reserves and rising environmental issues have increased the attention of researchers toward alternative fuels in place of conventional fuels. , To protect the environment, the search for green fuels to replace fossil fuels is necessary. , Biodiesel (the most attractive biofuel type) is the most potential alternative fuel for conventional diesel engines . Biodiesel can be used as a green fuel in engines in pure form or mixed with diesel in different ratios in compression combustion engines. , Transesterification of pure triglycerides, which are mainly found in expensive feedstocks such as vegetable oils, has been one of the most useful and widely used methods to produce biodiesel based on free fatty acids. − In recent years, many countries have emphasized and encouraged the use of alternative green fuels such as biodiesel fuel by governmental pathways by means of both incentives and prescriptive volumetric necessities . Biodiesel has been generally regarded as the most promising alternative fuel in comparison to petroleum-based diesel owing to its nontoxic, − sulfur-free, and biodegradable .…”