Physical Properties of Magnetite Nanoparticles Covered by 11-Mercaptoundecanoic Acid

Τimko, M.; Kopčanský, P.; Antalı́k, Marián; Šimšíková, Michaela; Valušová, Eva; Molčan, Matúš; Kováč, J.

doi:10.12693/aphyspola.121.1321

Cited by 3 publications

(2 citation statements)

References 10 publications

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“…This means that the desired absorbent surface has a positive charge at pHs less than 8.50 and a negative charge at pHs greater than 8.50. This value is very close to the zpc of the Fe3O4 [85].…”

Section: Thermal Analysissupporting

confidence: 71%

Simultaneous removal of phenoxy herbicides, 2-methyl-4-chlorophenoxyacetic acid and 2.4-dichlorophenoxyacetic acid from aqueous media by magnetized MgAl-LDH@Fe 3 O 4 composite: Application of partial least squares and Doehlert experimental design

Samadi‐Maybodi

Ghezel-Sofla

Biparva

2022

Preprint

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Phenoxy herbicides are families of chemicals that have been developed as commercially important herbicides, widely used in agriculture. Excessive consumption and increasing use of these pesticides to control pests of agricultural products and the continued entry of these pollutants into the environment due to their lack of biodegradability as well as their toxicity and carcinogenicity, has become one of the most challenging environmental problems today. Hormonal-like herbicides 2-Methyl-4-chlorophenoxyacetic acid (MCPA) and (2,4-Dichlorophenoxy)acetic acid (2.4-DCPA) are among the phenoxy herbicides that in mixed form, provide essential tools for modern farming for control of undesirable vegetation on grazing land, in crop, and non-crop lands. Natural clay minerals, especially layered double hydroxides (LDHs), are among the various materials that are used for pesticide adsorbents. LDHs have received special attention, mainly due to the large specific surface area associated with their layered structure, ease of synthesis, and the possibility of modifying their surfaces. In this work, a magnetized MgAl-LDH@Fe3O4 composite was prepared by co-precipitation method and used for the simultaneous removal of MCPA and 2.4-DCPA herbicides from aqueous solution by adsorption process. It should be noted that after the adsorption process, the magnetized MgAl-LDH@Fe3O4 nanocomposite can be separated and collected from the aqueous solution by an external magnet. Characterizations of the adsorbent were performed by various techniques, including Fourier transform infrared spectroscopy, X-ray diffraction, field emission scanning electron microscopy, energy dispersive X-ray spectroscopy and thermal analysis. The partial least square method was used to determine the concentration of each individual herbicide and in the mixture of them in the aqueous solution. Next, simultaneous adsorption of MCPA and 2.4-DCPA by LDH was optimized using Doehlert experimental design. The optimum conditions for adsorption were obtained as, adsorbent dosage 40.20 mg L−1, pH 6.8 and initial concentration 28.35 mg L−1. The equilibrium adsorption data were obtained using the Langmuir, Freundlich, Temkin and Dubinin-Radush-Kevich isotherms models. The results indicated that the experimental adsorption data were controlled by Freundlich models. The maximum adsorption capacity of MCPA and 2.4-DCPA herbicides on the MgAl-LDH@Fe3O4 adsorbent was obtained as, 134.50 and 131.30 mg g-1, respectively. The kinetic data of adsorption process were evaluated as pseudo-first order, pseudo-second order and intraparticle diffusion; the obtained results were well described by the pseudo-second-order model. Adsorption thermodynamic studies were also investigated. The positive ΔH◦ and negative values of ΔG° at various indicated that adsorption process is endothermic and spontaneous in nature respectively. The positive ΔS° value indicates the increase of disorder at the solid-solution interface during adsorption.

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Section: Thermal Analysissupporting

confidence: 71%

Simultaneous removal of phenoxy herbicides, 2-methyl-4-chlorophenoxyacetic acid and 2.4-dichlorophenoxyacetic acid from aqueous media by magnetized MgAl-LDH@Fe 3 O 4 composite: Application of partial least squares and Doehlert experimental design

Samadi‐Maybodi

Ghezel-Sofla

Biparva

2022

Preprint

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“…MUA has been used as the self-assembly reagent for preparing carboxylated noble metal nanoparticles [32] and is suitable for preparing other carboxylated nanoparticles. A previous research suggested that MUA forms a shell-layer around a non-noble-metal nanoparticle [33], the MUA might be attached to PBNPs by an electrostatic linkage. The negative charged functional groups of MUA could be linked to the exposed Fe 2+ or Fe 3+ on the PBNPs.…”

Section: Resultsmentioning

confidence: 99%

Prussian blue nanoparticles as nanocargoes for delivering DNA drugs to cancer cells

Wang

Chen

2013

Science and Technology of Advanced Materials

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We studied the use of Prussian blue nanoparticles (PBNPs) as novel nanocarriers for sending DNA drugs into cancer cells. 11-mercaptoundecanoic acid (MUA) was used to functionalize the surfaces of PBNPs (nanocubes with an average dimension of 75 nm) for subsequent covalent grafting of a 33-mer DNA drug with a FAM reporter at the 3′ end. The PBNPs synthesis and DNA drug conjugation were characterized by transmission electron microscopy (TEM) and Fourier-transform infrared absorption (FTIR), respectively. The drug was a decoy oligodeoxynucleotide (dODN) that inhibits the signal transducer and activator of transcription 3 (STAT3). The DNA–PBNPs drug (dODN@MUA–PBNPs) was delivered into human prostate carcinoma 22rv1 cells by endocytosis in vitro as confirmed by confocal fluorescence microscopy. MTT cell viability assays were carried out to assess the effect of the DNA–PBNPs drug. The results showed that the dODN molecules were successfully conjugated to the MUA modified PBNPs via amide and/or disulfide bond formation and could thus be successfully delivered into the cancer cells. The control experiments showed that the unconjugated dODN molecules were not able to enter the cancer cells no matter whether non-functionalized PBNPs were present or not. It was also found that the DNA-PBNPs drugs were internalized and then distributed homogeneously throughout the cell, including cytoplasmic and nucleic regions, after endocytosis. The cancer cell-killing ability increased with the amount of dODN conjugated on PBNPs and the dosage of DNA–PBNPs drug internalized.

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Study of the optimization and mechanism for the remediation process of Malachite green dye via hybrid-based Magnetite-date’s stones

Ahmed¹,

Mahmoud²,

Manda³

et al. 2022

Alexandria Engineering Journal

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Physical Properties of Magnetite Nanoparticles Covered by 11-Mercaptoundecanoic Acid

Cited by 3 publications

References 10 publications

Simultaneous removal of phenoxy herbicides, 2-methyl-4-chlorophenoxyacetic acid and 2.4-dichlorophenoxyacetic acid from aqueous media by magnetized MgAl-LDH@Fe 3 O 4 composite: Application of partial least squares and Doehlert experimental design

Simultaneous removal of phenoxy herbicides, 2-methyl-4-chlorophenoxyacetic acid and 2.4-dichlorophenoxyacetic acid from aqueous media by magnetized MgAl-LDH@Fe 3 O 4 composite: Application of partial least squares and Doehlert experimental design

Prussian blue nanoparticles as nanocargoes for delivering DNA drugs to cancer cells

Study of the optimization and mechanism for the remediation process of Malachite green dye via hybrid-based Magnetite-date’s stones

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