The Influence of Pluronic F-127 Modification on Nano Zero-Valent Iron (NZVI): Sedimentation and Reactivity with 2,4-Dichlorophenol in Water Using Response Surface Methodology

Abstract

Nano zero-valent iron (NZVI) is widely used for reducing chlorinated organic pollutants in water. However, the stability of the particles will affect the removal rate of the contaminant. In order to enhance the stability of nano zero-valent iron (NZVI), the particles were modified with F-127 as an environmentally friendly organic stabilizer. The study investigated the effect of the F-127 mass ratio on the colloidal stability of NZVI. Results show that the sedimentation behavior of F-NZVI varied at different mass ratios. A biphasic model was used to describe the two time-dependent settling processes (rapid sedimentation followed by slower settling), and the settling rates were calculated. The surface morphology of the synthesized F-NZVI was observed with a scanning electron microscope (SEM), and the functional groups of the samples were analyzed with Fourier Transform Infrared Spectroscopy (FTIR). Results show that the F-127 was successfully coated on the surface of the NZVI, and that significantly improved the stability of NZVI. Finally, in order to optimize the removal rate of 2,4-dichlorophenol (2,4-DCP) by F-NZVI, three variables were tested: the initial concentration 2,4-DCP, the pH, and the F-NZVI dosage. These were evaluated with a Box-Behnken Design (BBD) of response surface methodology (RSM). The experiments were designed by Design Expert software, and the regression model of fitting quadratic model was established. The following optimum removal conditions were determined: pH = 5, 3.5 g·L−1 F-NZVI for 22.5 mg·L−1 of 2,4-DCP.

Synthesis And Characterization Of Fe0@Chitosan/Cellulose Green Nanocomposite As Advanced Carrier For Ibuprofen Drug; Loading And Release Properties

“…2C). The detected small band at 669 cm − 1 and 560 cm − 1 (Fe-O) declare the partial oxidation of the Fe 0 iron particles which is in agreement with the XRD ndings [25,26] (Fig. 2C).…”

“…Among the green fabricated metals and metal oxides, zero-valent iron (Fe 0 ) and Fe 2 O 3 NPs were investigated as innovative materials for biomedical industries, drug delivery systems, tissue repair applications, and hyperthermia [23,25]. Such nanoparticles are of good dispersion properties, high stability, signi cant biocompatibility, high biodegradability, and nontoxicity [25,26].…”

“…Among the green fabricated metals and metal oxides, zero-valent iron (Fe 0 ) and Fe 2 O 3 NPs were investigated as innovative materials for biomedical industries, drug delivery systems, tissue repair applications, and hyperthermia [23,25]. Such nanoparticles are of good dispersion properties, high stability, signi cant biocompatibility, high biodegradability, and nontoxicity [25,26]. Therefore, the presented study involved a novel synthesis of cellulose, chitosan, and Fe 0 heterostructure (Fe 0 @CH/CS) green extract of khaya senegalensis leaves and sugarcane bagasse as cellulose precursor.…”

The Effect of Shape-Controlled Pt and Pd Nanoparticles on Selective Catalytic Hydrodechlorination of Trichloroethylene

“…The structure sensitivity of the reaction has been debated, as there are a variety of influencing effects. The support material [32][33][34][35], metal/support interactions [31,[36][37][38][39][40], pretreatment and reaction conditions [23,41], metal surface orientation [29,[42][43][44][45][46][47][48] and metal dispersion/particle size [33,36,37,44,46,[49][50][51][52][53] are crucial for efficient selective catalytic reactions. Specifically, the coordination numbers of the metal atoms in the nanoparticles may vary, being, e.g., 9, 8 and 7 in surface planes of (111), (100) and (110), respectively [54][55][56].…”

“…Specifically, the coordination numbers of the metal atoms in the nanoparticles may vary, being, e.g., 9, 8 and 7 in surface planes of (111), (100) and (110), respectively [54][55][56]. Furthermore, the interaction between the metal surface atoms and the reactants (via adsorption/desorption energies) are critical for selectivity [42,49,57]. However, few reports on HDCl have focused on the relationship between well-controlled nanoparticle surfaces and their catalytic performance, especially selectivity.…”