Preparing Fe[sub 3]O[sub 4] Nanoparticles from Fe[sup 2+] Ions Source by Co-precipitation Process in Various pH

The magnetic Fe3O4 nanoparticles had been synthesized by co-precipitation process and surface treatment by silane coupling agent (KH570). The magnetic Fe3O4/PMMA nanocomposite films were prepared by blend method, and the chemical structure, mechanical properties, surface morphology and the biocompatibility of the nanocomposite films were studied in this work. The magnetic Fe3O4 nanoparticles were well dispersed in the Fe3O4/PMMA nanocomposite films. The strength of the nanocomposite films, as well as the strain, decreased first and then increased with the increasing of the nanoparticles. The hemolytic ratio indicated that the nanocomposite films had a better blood compatibility.

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Novel Fe3O4/HNT@rGO composite via a facile co-precipitation method for the removal of contaminants from aqueous system

RSC Advances ◽

10.1039/c6ra01279e ◽

2016 ◽

Vol 6 (54) ◽

pp. 49228-49235 ◽

Cited By ~ 10

Author(s):

Chengwei Gao ◽

Baojun Li ◽

Ning Chen ◽

Jie Ding ◽

Qiang Cai ◽

...

Keyword(s):

Heat Treatment ◽

Water Treatment ◽

Potential Application ◽

High Performance ◽

Aqueous System ◽

Precipitation Method ◽

Precipitation Process ◽

System P ◽

Removal Of Contaminants ◽

Co Precipitation

Fe3O4/HNT@rGO composite (FHGC) was fabricated via a facile co-precipitation process, followed by heat treatment. For RhB and As5+removal, the high performance and easy separation of FHGC highlight its potential application in water treatment.

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Structural and Optical Properties of F-Doped ZnO Nanoparticles Synthesized by Co-Precipitation Process

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.675-676.69 ◽

2016 ◽

Vol 675-676 ◽

pp. 69-72

Author(s):

Krisana Chongsri ◽

Wanichaya Mekprasart ◽

Wisanu Pecharapa

Keyword(s):

Zno Nanoparticles ◽

Fluoride Concentration ◽

Precursor Solution ◽

Hexagonal Wurtzite Structure ◽

Ammonium Fluoride ◽

Zinc Nitrate ◽

Precipitation Process ◽

Vis Spectroscopy ◽

Doped Zno ◽

Co Precipitation

In this work, we reported the preparation of F-doped ZnO nanoparticles by facile precipitation process using zinc nitrate and ammonium fluoride as starting precursors for Zn and F, respectively dissolved in deionized water. The precursor solution was prepared at various fluoride composition ranging from 1-5 wt%. The as-precipitated powders were calcined at different temperature from 500 °C to 700 °C for 2 h. Effect of calcination temperature and fluoride concentration on structural, morphologies, optical and electrical properties were investigated by X-ray diffraction (XRD), scanning electron microscope (SEM), UV-Vis spectroscopy, respectively. XRD results indicated the complete formation of hexagonal wurtzite structure of ZnO. SEM micrographs showed the agglomeration for each sample that noticeably influenced by fluoride content.

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Coagulation of humic acid by ferric chloride in saline (marine) water conditions

Water Science & Technology ◽

10.2166/wst.2003.0012 ◽

2003 ◽

Vol 47 (1) ◽

pp. 41-48 ◽

Cited By ~ 19

Author(s):

J. Duan ◽

N.J.D. Graham ◽

F. Wilson

Keyword(s):

Humic Acid ◽

Zeta Potential ◽

Membrane Filtration ◽

Metal Salt ◽

Substantial Effect ◽

Precipitation Process ◽

Solution Ph ◽

Floc Size ◽

Coagulant Dosage ◽

Co Precipitation

The coagulation of a model seawater-humic acid solution with a hydrolysis metal salt (FeCl3) has been studied by monitoring floc size, solution pH, and zeta potential. The kinetic features of the orthokinetic coagulation have been demonstrated in relation to coagulant dosages, solution pH and zeta potential. Humic acid removal and floc charge reduction increased with coagulant dosage. Adjusting the solution pH prior to coagulation had a substantial effect on the treatment performance. By pH adjustment to pH 6, the greatest humic acid removal (by coagulation and subsequent membrane filtration) and the largest floc size was achieved at a FeCl3 dosage of 200 mmol l−1. It is believed that the coagulation is characterised by competition between OH- ions and humic acid for ferric ions in the co-precipitation process. In acidic pH, where the concentration of OH- ions is low, humic acid molecules may compete more favourably for bonding sites in the co-precipitation, which leads to a more compact precipitation and a higher overall humic acid removal.

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EFFECT OF NANOSIZED TiO2 POWDER ON PREPARATION AND PROPERTIES OF Ag-BASED ELECTRODE MATERIALS

International Journal of Nanoscience ◽

10.1142/s0219581x04002723 ◽

2004 ◽

Vol 03 (06) ◽

pp. 829-837

Author(s):

SOON-JONG JEONG ◽

JUNG-HYUK KOH ◽

DONG-YOON LEE ◽

JAE-SEOK LEE ◽

MUN-SU HA ◽

...

Keyword(s):

Electrical Conductivity ◽

Bonding Strength ◽

Electrode Materials ◽

Precipitation Process ◽

Nano Oxide ◽

Diffusion Controlled ◽

State Diffusion ◽

Acid Reaction ◽

Co Precipitation ◽

Mechanical Bonding

This study presents the synthesis of nano-oxide-added Ag/Pd powders and its properties tolerable at temperatures above 1100°C for an electrode material utilized in multilayer ceramic devices. The powders of xAg/yPd powder around core cell TiO 2 were formed in a co-precipitation process of Ag and Pd in nano-oxide-dispersed solution, where Ag and Pd precursors are melted in HNO 3 acid. Reaction between ceramic and electrode layers with nanoparticle oxide powder allows internal stress to reduce and mechanical bonding strength to increase due to anchor effect. The densification of the nano-oxide-added electrode paste followed the TiO 2 solid state diffusion-controlled mechanism upon sintering process. The mechanical bonding strength and electrical conductivity were measured after sintering the electrode-printed sheets. As a result, very high adhesive strength over the piezoelectric ceramics' fracture strength and good electrical conductivity of more than 104/Ωcm could be obtained in the multilayer ferroelectric structure which is a form of stacking ceramics layer and electrode layer containing nanoparticles.

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Uranium(VI) Uptake by Synthetic Calcium Silicate Hydrates

MRS Proceedings ◽

10.1557/proc-1107-467 ◽

2008 ◽

Vol 1107 ◽

Cited By ~ 13

Author(s):

J. Tits ◽

T. Fujita ◽

M. Tsukamoto ◽

E. Wieland

Keyword(s):

Solid Phase ◽

Near Field ◽

Sorption Isotherms ◽

Alkaline Solutions ◽

Precipitation Process ◽

Direct Reaction ◽

Reaction Method ◽

Calcium Silicate Hydrates ◽

Chemical Conditions ◽

Co Precipitation

AbstractThe immobilization of U(VI) by C-S-H phases under conditions relevant for the cementitious near field of a repository for radioactive waste has been investigated. C-S-H phases have been synthesized using two different procedures: the “direct reaction” method and the “solution reaction” method.The stabilities of alkaline solutions of U(VI) (presence of precipitates or colloidal material) were studied prior to sorption and co-precipitation tests in order to determine the experimental U(VI) solubility limits. These U(VI) solubility limits were compared with the U(VI) solubilities obtained from thermodynamic speciation calculations assuming the presence of combinations of different solid U(VI) phases. The solid phase controlling U(VI) solubility in the present experiments was found to be CaUO4(s).The U(VI) uptake kinetics and sorption isotherms on C-S-H phases with different C:S ratios were determined under various chemical conditions; e.g., sorption and co-precipitation experiments and different pH’s. U(VI) was found to sorb fast and very strongly on C-S-H phases with distribution ratios (Rd values) ranging in value between 103 L kg-1 and 106 L kg-1. Both sorption and co-precipitation experiments resulted in Rd values which were very similar, thus indicating that no additional sorption sites for U(VI) were generated in the co-precipitation process. Furthermore, C-S-H synthesis procedures did not have a significant influence on U(VI) uptake. The U(VI) sorption isotherms were found to be non-linear, and further, increasing Ca concentrations resulted in increasing U(VI) uptake. The latter observation suggests that U(VI) uptake is controlled by a solubility-limiting process, while the former observation further indicates that pure Ca-uranate is not the solubility-limiting phase. It is proposed that a solid solution containing Ca and could control U(VI) uptake by C-S-H phases.

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Synthesis of (2D) MNPs nanosheets of nickel ferrite using a low-cost co-precipitation process

Materials Science and Engineering B ◽

10.1016/j.mseb.2018.10.012 ◽

2018 ◽

Vol 232-235 ◽

pp. 48-54 ◽

Cited By ~ 3

Author(s):

N. Hosni ◽

K. Zehani ◽

R. Pires Brazuna ◽

J. Moscovici ◽

L. Bessais ◽

...

Keyword(s):

Nickel Ferrite ◽

Low Cost ◽

Precipitation Process ◽

Co Precipitation

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Fenton Degradation of Ofloxacin Using a Montmorillonite-Fe3O4 Composite

Chemistry Proceedings ◽

10.3390/eccs2020-07528 ◽

2020 ◽

Vol 2 (1) ◽

pp. 32

Author(s):

Alamri Rahmah Dhahawi Ahmad ◽

Saifullahi Shehu Imam ◽

Wen Da Oh ◽

Rohana Adnan

Keyword(s):

Electron Microscope ◽

Photoelectron Spectroscopy ◽

High Efficiency ◽

Solar Irradiation ◽

Precipitation Process ◽

Wastewater Remediation ◽

Solution Ph ◽

X Ray ◽

Subsequent Degradation ◽

Co Precipitation

In this work, FeM composites consisting of montmorillonite and variable amounts of Fe3O4 were successfully synthesized via a facile co-precipitation process. They were characterized using X-ray photoelectron spectroscopy (XPS), field emission scanning electron microscope (FESEM), energy dispersive X-ray spectroscopy (EDX), transmission electron microscope (TEM), N2 adsorption-desorption, and Fourier transform infrared spectroscopy (FT-IR) techniques to explain the effect of Fe3O4 content on the physicochemical properties of the Fe3O4-montmorillonite (FeM) composites. The FeM composites were subsequently used as heterogeneous Fenton catalysts to activate green oxidant (H2O2) for the subsequent degradation of ofloxacin (OFL) antibiotic. The efficiency of the FeM composites was studied by varying various parameters of Fe3O4 loading on montmorillonite, catalyst dosage, initial solution pH, initial OFL concentration, different oxidants, H2O2 dosage, reaction temperature, inorganic salts, and solar irradiation. Under the conditions of 0.75 g/L FeM-10, 5 mL/L H2O2, and natural pH, almost 81% of 50 mg/L of OFL was removed within 120 min in the dark, while total organic carbon (TOC) reduction was about 56%. Moreover, the FeM-10 composite maintained high efficiency and was stable even after four continuous cycles, making it a promising candidate in real wastewater remediation.

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Optimizing Solvent Selection and Processing Conditions to Generate High Bulk-Density, Co-Precipitated Amorphous Dispersions of Posaconazole

Pharmaceutics ◽

10.3390/pharmaceutics13122017 ◽

2021 ◽

Vol 13 (12) ◽

pp. 2017

Author(s):

Derek Frank ◽

Luke Schenck ◽

Athanas Koynov ◽

Yongchao Su ◽

Yongjun Li ◽

...

Keyword(s):

Bulk Density ◽

Precipitation Process ◽

Processing Conditions ◽

Solvent Selection ◽

Bulk Powder ◽

High Bulk Density ◽

Powder Properties ◽

Amorphous Dispersions ◽

Co Precipitation ◽

High Bulk

Co-precipitation is an emerging method to generate amorphous solid dispersions (ASDs), notable for its ability to enable the production of ASDs containing pharmaceuticals with thermal instability and limited solubility. As is true for spray drying and other unit operations to generate amorphous materials, changes in processing conditions during co-precipitation, such as solvent selection, can have a significant impact on the molecular and bulk powder properties of co-precipitated amorphous dispersions (cPAD). Using posaconazole as a model API, this work investigates how solvent selection can be leveraged to mitigate crystallization and maximize bulk density for precipitated amorphous dispersions. A precipitation process is developed to generate high-bulk-density amorphous dispersions. Insights from this system provide a mechanistic rationale to control the solid-state and bulk powder properties of amorphous dispersions.

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