Preparation and Characterization of Dendrimer‐Modified Magnetite Nanoparticles for Adsorption of Humic Acid from Aqueous Solution

Abstract

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 (R2=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.

Fabrication of Nano Zero valent Iron/Biopolymer Composite with Antibacterial Properties for Simultaneous Removal of Nitrate and Humic Acid: Kinetics and Isotherm Studies

“…HA are a sort of macromolecule organic matter that exists in soil and sources of drinking water storage and have a negative surface charge such as carboxylic (-COOH) and phenolic (-OH) which linked with aromatic rings [7,8,[10][11][12]. The presence of HA in the water can lead to a yellowish to brown color, taste, and odor problems that are aesthetically unpleasant and can also lead to Blackfoot diseases, cancer, and goiter.…”