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

Abstract

In this study, new, efficient, eco-friendly and magnetically separable nanoadsorbents, MNPs-G1-Mu and MNPs-G2-Mu, were successfully prepared by covalently grafting murexide-terminated polyamidoamine dendrimers on 3-aminopropyl functionalized silica-coated magnetite nanoparticles, and used for rapid removal of lead (II) from aqueous medium. After each adsorption process, the supernatant was successfully acquired from reaction mixture by the magnetic separation, and then analyzed by employing ICP-OES. Chemical and physical characterizations of new nanomaterials were confirmed by XRD, FT-IR, SEM, TEM, and VSM. Maximum adsorption capacities (q m ) of both prepared new nanostructured adsorbents were compared with each other and also with some other adsorbents. The kinetic data were appraised by using pseudo-first-order and pseudo-second-order kinetic models. Adsorption isotherms were found to be suitable with both Langmuir and Freundlich isotherm linear equations. The maximum adsorption capacities for MNPs-G1-Mu and MNPs-G2-Mu were calculated as 208.33 mg g −1 and 232.56 mg g −1 , respectively. Antimicrobial activities of nanoparticles were also examined against various microorganisms by using microdilution method. It was determined that MNPs-G1-Mu, MNPs-G2-Mu and lead (II) adsorbed MNPs-G2-Mu showed good antimicrobial activity against S. aureus ATTC 29213 and C. Parapsilosis ATTC 22019. MNPs-G1-Mu also showed antimicrobial activity against C. albicans ATTC 10231.

Cadmium oxide nanoparticles/graphene composite: synthesis, theoretical insights into reactivity and adsorption study

“…The results of adsorption kinetic experiments were studied by four models: the pseudo-rst-and second-order, intraparticle, and Elovich models. Pseudo-rst-order, eqn (3) presumes that the sorption rate depends on the removal capacity. 33 log(q e À q t ) ¼ log q e À (K 1 /2.303)t…”

“… 2 It can cause damage to brain cortex cells, the nervous system, sensory disturbance, and other symptoms. 3 Thus, the removal of lead and other heavy metals from water streams is a vital necessity. Until now, conventional methods to remove heavy metals include coagulation, 4 precipitation, chemical reduction, 5 ion exchange, 6 biological treatment, 7 membrane separation, 8 and filtration.…”

A Review: Adsorption and Removal of Heavy Metals Based on Polyamide-amines Composites

“…In general, the composite adsorbent obtained by modifying magnetic nano-material with PAMAMs has a certain potential application value for the development of heavy metal adsorption research. Ekinci et al (2021) successfully prepared magnetically separable nanoadsorbents 2016) had grown the adsorbent formed by the thirdgeneration-PAMAM dendritic structure on superparamagnetic epoxy polymer composites by soap-free emulsion polymerization procedure to remove U 6+ , and the results showed that there was no significant loss of adsorption capacity after five adsorption cycles. All these reflect that polyamide-amines composite can achieve effective and regenerative effect in the removal of heavy metal ions.…”

Magnetic Dispersive Solid‐Phase Extraction Using Toner Powder for Trace Determination of Heavy Metals in Vegetables and Aqueous Media by FAAS: Box‐Behnken Design

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