Magnetic Fe3O4@C nanoparticles as adsorbents for removal of amoxicillin from aqueous solution

Abstract

In the present study, powder activated carbon (PAC) combined with Fe(3)O(4) magnetite nanoparticles (MNPs) were used for the preparation of magnetic composites (MNPs-PAC), which was used as an adsorbent for amoxicillin (AMX) removal. The properties of magnetic activated carbon were characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, Brunaeur, Emmett and Teller and vibrating sample magnetometer. The operational factors affecting adsorption such as pH, contact time, adsorbent dosage, initial AMX concentration and temperature were studied in detail. The high surface area and saturation magnetization for the synthesized adsorbent were found to be 671.2 m(2)/g and 6.94 emu/g, respectively. The equilibrium time of the adsorption process was 90 min. Studies of adsorption equilibrium and kinetic models revealed that the adsorption of AMX onto MNPs-PAC followed Freundlich and Langmuir isotherms and pseudo-second-order kinetic models. The calculated values of the thermodynamic parameters, such as ΔG°, ΔH° and ΔS° demonstrated that the AMX adsorption was endothermic and spontaneous in nature. It could be concluded that MNPs-PAC have a great potential for antibiotic removal from aquatic media.

Application of Fe3O4@C catalyzing heterogeneous UV-Fenton system for tetracycline removal with a focus on optimization by a response surface method

“…The main source of antibiotics is the excretion, due to the incomplete absorption of medicaments by organisms in human and veterinary medicine. On the other hand, conventional wastewater treatments can only remove 60-90% of antibiotics [2,3]. Therefore, their complete elimination from contaminated wastewaters is necessary.…”

“…In addition to operation in a narrow pH range (2)(3)(4), the problems associated with separation and recovery of ions after the catalyst treatment, as well as secondary pollution by acid, metal ions and metal hydroxide sludge have been regarded as the main disadvantages of the Fenton process [9,12]. The use of iron-containing solids (Fe2O3, Fe3O4, Fe o , FeOH, etc.)…”

“…Additionally, Fe3O4 nanoparticles have features such as convenient fabrication, biocompatibility, high stability, easy separation from the reaction system using external magnetic field and in-situ application [3,9,17].…”

Role of [FeOx(OH)y] surface sites on the adsorption of β-lactamic antibiotics on Al2O3 supported Fe oxide

“…Different materials have been utilized for amoxicillin adsorption, such as activated carbons prepared by several routes, e.g. biomass KOH/microwave activated (KAC) [38][39][40], magnetic carbon nanoparticles (MNPs PAC) [41], physical activation of a lignocellulosic precursor (OP), NH 4 Cl activated carbon (NAC). It is interesting to compare the adsorption capacity of these different adsorbents normalized by surface area.…”

“…All the high surface area carbons, KAC (microwave prepared activated carbon, 1065 m 2 g −1 [38]), OP (activated carbon modified by oxidation 1106 m 2 g −1 [39]), and NAC (NH 4 Cl activated carbon 1029 m 2 g −1 [40]), and also MNPs PAC (magnetic Fe 3 O 4 @C nanoparticles 671 m 2 g −1 [41]), showed surface adsorption capacities near 0.12-0.22 mg AMX m −2 . On the other hand, the composite 150Fe50A presented the highest adsorption capacity, i.e.…”