Adsorptive Removal of Arsenic from Aqueous Solutions Using Amino Functionalized Super paramagnetic Iron Oxide Nanoparticle/SiO2

Biological application of nanoparticles (NPs) is a rapidly developing area of nanotechnology, providing new possibilities in the diagnosis and treatment of human diseases. Nowadays, NPs have shown abilities to be used as alternative treatment for difficult diseases. Therefore, it is important to understand NP chemistry, preparation, interaction and possible mechanisms involved in its interaction with cancer cells and bacterial membranes. This study reports comparison between Au, Ag and ZnO NPs, and discusses their toxicity and physicochemical properties. In addition, this work aims to review different strategies of surface modification and functionalization of colloidal nanoparticles. Gold nanoparticles Silver nanoparticles Zinc oxide nanoparticles Toxicity growth Antibacterial activity Stability Capping agents

Section: Stabilised Np By Amine Ligandsmentioning

confidence: 99%

Section: Stabilised Np By Amine Ligandsmentioning

confidence: 99%

Comparison of Chemical and Biological Properties of Metal Nanoparticles (Au, Ag), with Metal Oxide Nanoparticles (ZnO-NPs) and their Applications

Abdussalam-Mohammed

2020

“…Heavy metals have been known as water contaminants, even at permissible concentrations [1][2][3][4]. Among the heavy metals, arsenic is known as one of the most toxic metals in many parts of the world [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Adsorption and Photocatalytic Removal of Arsenic from Water by a Porous and Magnetic Nanocomposite: Ag/TiO2/Fe3O4@GO

Miranzadeh

Afshari²,

Khataei

et al. 2020

As (III) regularly requires oxidation to As (V), before it can be removed from water. Here, we reported photocatalytic removal of As (III) as well as adsorption of As (III) and As (V) using a novel, porous magnetic Ag/TiO2/Fe3O4@GO nanocomposite which was characterized via FT-IR, XRD, SEM, and TEM. A mathematical model (the central composite design) was used to estimate the relationship between the observed adsorption and our set of variables including initial concentration of arsenic ions, adsorbent dosage, pH, and the contact time. An optimum adsorption capacity of about 91% was observed for As (III) using 20 mg adsorbent with 24 ppm initial concentration of As (III), at pH = 5, within 90 min, and room temperature. Likewise, an optimum adsorption capacity of about 87% was observed for As (V) using 11 mg adsorbent with 17 ppm initial concentration of As (V), at pH = 3, within 30 min, and room temperature. The electrostatic factors between surface charge of nanocomposite and arsenic species were used to explain adsorption behavior of As (III) and As (V) at different conditions. The Langmuir isotherm equations best interpreted the nature of adsorption of As (III) and A (V). It was found during phocatalytic process maximum R% was about 63% for As (III) using 40 mg photocatalyst. Arsenic Adsorption Photocatalyst Magnetic nanocomposite Ag nanoparticles M. Miranzadeh et al.

“…Among those factors, heat insulation layer is the major factor effecting the bonding property [6]. The insulation layer contains active groups, such as hydroxyl groups that can adsorb water molecules and at the same time can absorb isocyanate compounds [7,8]. Therefore, the effect of the water in the insulating layer on bonding property has attracted a considerable attention.…”

Section: Introductionmentioning

confidence: 99%

Effect of Insulation Layer Composite and Water Adsorption on Bonding Performance in Heat Barriers

Awad

Nasser

2020

Thermal insulation layer in solid rocket motors is a vital component during the rocket flight. Many factors can affect the performance of this insulation layer. Bonding property between rocket propellant and the thermal insulation layer are examined in this study. Hydroxyl terminated polybutadiene (HTPB) and isophorone diisocyanate (IPDI) as a curative was chosen as the most common type of rocket propellant. The effect of two types of polymeric insulation layer such as nitrile butadiene rubber (NBR) and ethylene-propylene-diene monomer (EPDM), on the bonding performance at the interface between (HTPB/IPDI) propellant and the respective insulation layer has been investigated. Results revealed that both types of insulation layer considerably decreased the interfacial bonding performance of the (HTPB/IPDI) propellant. NBR was proven to be more severe on weakening the adhesion strength than that of the EPDM. We further investigated the effects of the thickness and water content of NBR on the bonding performance, and proved that bonding strength was inversely proportional to the thickness and the water content.