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Preparation and Characterization of Dendrimer‐Modified Magnetite Nanoparticles for Adsorption of Humic Acid from Aqueous Solution
Author(s) -
Beiki Somayeh,
Moniri Elham,
Hassani Amir Hessam,
Ahmad Panahi Homayon
Publication year - 2020
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.202000737
Subject(s) - adsorption , aqueous solution , endothermic process , gibbs free energy , materials science , langmuir adsorption model , enthalpy , nanoparticle , polyacrylic acid , magnetite , dendrimer , humic acid , nuclear chemistry , chemical engineering , freundlich equation , chemistry , polymer , polymer chemistry , nanotechnology , organic chemistry , quantum mechanics , fertilizer , physics , engineering , metallurgy , composite material
In the present study, innovative Dendrimer‐Modified Magnetite Nanoparticle (DMMN) with core‐shell structures were synthesized as an adsorbent to remove humic acid (HA) from aqueous solution. Using the co‐precipitation technique, super paramagnetic iron nanoparticles were synthesized, and the surface of nanoparticles was functionalized with 3‐aminopropyltrimethoxysilane (APTMS). Then, 10‐generation dendrons were synthesized on the surface of functionalized nanoparticles by polymer grafting method. The sample was characterized by Fourier Transform Infra‐Red (FT‐IR), X‐ray diffraction (XRD), Scanning Electron Microscopy (SEM), Energy Dispersive X‐ray (EDX), and Barrett‐Joyner‐Halenda (BJH) as well as Brunauer‐Emmett‐Teller (BET) analyses, which the surface area of specific DMMN was achieved as 81.37 m2 g −1 . Based on the obtained analysis results (SEM, XRD), 90 % of synthesized average nanoparticles diameter is less than 4 nm. Batch experiments were performed under varying operational conditions, namely pH, contact time, initial concentration HA, and adsorbent weight. The optimum adsorbent weight was found to be 0.25 gL −1 , while the adsorption process was found to be optimal in the broad pH range of 3–9. The pseudo‐second‐order equation excellently defined the adsorption kinetics when the Langmuir model (R 2 =0.9967) better fit the adsorption isotherms. The adsorption capacity of DMMN was 103.8 mg HAg −1 , that led to 99 % HA adsorption. Moreover, the calculated thermodynamic parameters, including standard enthalpy, entropy, and Gibbs free energy, show the spontaneous and endothermic nature of the adsorption procedure.