Fabrication and characterization of high-branched recyclable PAMAM dendrimer polymers on the modified magnetic nanoparticles for removing naphthalene from aqueous solutions

Magnetite nanoparticles grafted with murexide-terminated polyamidoamine dendrimers for removal of lead (II) from aqueous solution: synthesis, characterization, adsorption and antimicrobial activity studies

“…As shown in Figure 2 , in spectrum (a), vibrational stretching modes belong to Fe–O in 586 cm −1 and 876 cm −1 show that magnetic nanoparticles are formed [ 23 , 54 , 55 , 56 , 57 ]. Broad band at 3456 cm −1 occurs because of the O–H strain vibration peak caused by adsorbed water and silanol groups in hydrogen-bonded [ 58 , 59 ]. (b) It is understood from the peaks of Si–O–Si bond at 793 cm −1 and Si–O–Fe bond at 1085 cm −1 that silica is bound to MNPs [ 26 ].…”

“…According to R 2 values ( Figure 12 ), the adsorptions of lead (II) on MNPs-G1-Mu and MNPs-G2-Mu are suitable with both isotherm models, but the adsorption of lead (II) on MNPs-G1-Mu is more appropriate for Freundlich model and the adsorption of lead (II) on MNPs-G2-Mu is also more appropriate for Langmuir model owing to higher R 2 values given in Table 2 . Langmuir model describes the monolayer homogenous, and Freundlich model describes multi-layer heterogonous adsorption [ 58 ]. It is possible that the adsorption process occurs by forming chelates between the O and N atoms in the structure of the adsorbent and lead (II) ions.…”

Magnetic nanoadsorbents for micropollutant removal in real water treatment: a review

“…Magnetic nanoadsorbents have been observed to lose their adsorptive capacity after multiple reuse cycles (Meng et al 2018 ; Wanjeri et al 2018 ; Aliannejadi et al 2019 ; Ma et al 2019 ; Baig et al 2020 ; Masjedi et al 2020 ; Rezaei et al 2020 ; Peralta et al 2021 ). For example, ibuprofen uptake by an as-prepared hybrid silica-based magnetic nanoadsorbent experienced a drastic 42% decline in the second cycle, implying that the regeneration reagent used (ethanol) had not extracted all of the ibuprofen adsorbed in the previous adsorption step (Peralta et al 2021 ).…”

“…For example, ibuprofen uptake by an as-prepared hybrid silica-based magnetic nanoadsorbent experienced a drastic 42% decline in the second cycle, implying that the regeneration reagent used (ethanol) had not extracted all of the ibuprofen adsorbed in the previous adsorption step (Peralta et al 2021 ). Naphthalene removal efficiency by a highly branched dendrimeric magnetic nanoadsorbent decreased in the last use cycles to reach 54% by the tenth cycle (Aliannejadi et al 2019 ). Fe 3+ removal efficiency by a magnetic core-shell Fe 3 O 4 @mSiO 2 -NH 2 adsorbent was reduced by about 8% after cycle 1, followed by a decrease of less than 2.5% in the next three cycles (Meng et al 2018 ).…”

Thermodynamic, Kinetic and Isotherm Study of 4-chloro-2-methyl Phenoxy Acetic Acid (MCPA) by (PV/S-g-3D-GO/N) from Aquatic Solutions

“…However, unique properties of Graphene based adsorbent make it good candidate for remove different kind of contaminant from aquatic solution and different author reported different dosage for optimum removal e ciency that is different from /L0.1-12 mg for different pollution such as organic and inorganic pollutant (33). The reason is that when the dosage of the PV/S-g-3D-GO/N increased, the adsorption sites and functional groups on the adsorbent surface increased (34,35) and lead to increasing removal e ciency. This could be due to the increase of active sites and functional groups at the nano-adsorbent surface.…”