Magnetic Fe₃O₄-graphene oxide nanocomposite – synthesis and practical application for the heterogeneous photo-Fenton degradation of different dyes in water

Synthesis and application of ferromagnetic graphene oxide nanocomposite as an effective adsorbent for Clonazepam: Batch experiments, modeling, regeneration, and phytotoxicity

“…The bands around 3400 cm − 1 , 1575 cm − 1, and 1225 cm − 1 remained in the mGO spectrum, although with different intensities. Furthermore, the presence of iron on the surface of mGO was confirmed from the band observed at approximately 578 cm − 1, attributed to vibrations of Fe-O elongation [9,24,63,71]. Moreover, the band at 872 cm − 1 can be attributed to the Fe (3+) OH deformations on the material surface [40].…”

“…According to the images, there are indications of oxygenated functional groups in the GO. The broadband ranging from 3700 to 3000 cm − corresponds to the hydroxyl groups (OH)of the water molecules adsorbed in the sample's basal planes, which may indicate the hydrophilic character of this material [9]. The sign at 1738 cm − 1 corresponds to the vibration of the C--O elongation, characteristic of carbonyl and carboxyl groups [52].…”

Removal of Amitraz insecticide by heterogeneous UV‐Fenton process using metals supported on chitosan beads as a catalyst

“…The presence of a UV irradiation is necessary to accelerate the reductive generation of Fe(II) in all iron impregnated catalysts and essentially Fe(III) 31 . In fact, it is well established that in heterogeneous UV‐Fenton process using supported magnetite as a catalyst, after addition of H 2 O 2 , the reactive site Fe(II)/H 2 O 2 on the surface of Fe 3 O 4 nanoparticles transformed to Fe(III) producing the hydroxyl radicals (Equation ) 32,33 . Then, hydroxyl radicals can react to oxidize AMZ molecules.…”

Photocatalytic activity of GO/Fe₃O₄ fabricated by Sri Lankan graphite under visible light irradiation

“…They show excellent photocatalytic properties which could be ascribed to the photo-generated charge carriers immediately transfers to graphene sheets from metal oxide nanoparticles increasing the separation of electron/hole pairs and hence improve the degradation mechanism (Khan et al, 2019). Graphene oxide/Fe3O4 have been used to photocatalytically degrade dyes including methylene blue (Gong, 2016;Baptisttella et al, 2021), rhodamine B (Wang et al, 2018), reactive black (Baptisttella et al, 2021), acid blue (Baptisttella et al, 2021) etc. Sri Lanka is known for high purity graphite naturally available on large scale.…”