scholarly journals Green Synthesis of Spherical Calcium Hydroxide Nanoparticles in the Presence of Tannic Acid

2020 ◽  
Vol 2020 ◽  
pp. 1-6
Author(s):  
Peiyuan Chen ◽  
Yonghui Wang ◽  
Shicheng He ◽  
Pengju Wang ◽  
Ying Xu ◽  
...  
Keyword(s):  
Calcium Hydroxide ◽  
Tannic Acid ◽  
Crystalline Phase ◽  
Low Cost ◽  
Nucleation And Growth ◽  
Robust Method ◽  
Strong Bond ◽  
Amorphous Phases ◽  
Co Precipitation ◽  
Bond Effect

This study proposes a green, low-cost, and robust method to synthesize spherical calcium hydroxide (CH) nanoparticles based on the co-precipitation of Ca2+ and OH− in the presence of tannic acid (TA), an inexpensive plant-derived polyphenol. It has been found that the morphology and crystalline phase of the produced CH nanoparticles can be controlled by TA. With the increasing dosage of TA, the crystallinity of the CH particles reduces, changing from well crystallization to amorphous phases. Experimental evidence suggests that complexion reaction took place between TA and Ca2+, which gave the Ca2+ a strong bond effect. As a result, the nucleation and growth of CH were significantly affected. CH nanoparticles with sizes of about 50 nm have been successfully synthesized by using 0.3% or more TA.

scholarly journals Preparation of Porous Hydroxyapatite Using Cetyl Trimethyl Ammonium Bromide as Surfactant for the Removal of Lead Ions from Aquatic Solutions

Polymers ◽  
2021 ◽  
Vol 13 (10) ◽  
pp. 1617
Author(s):  
Silviu-Adrian Predoi ◽  
Carmen Steluta Ciobanu ◽  
Mikael Motelica-Heino ◽  
Mariana Carmen Chifiriuc ◽  
Monica Luminita Badea ◽  
...  
Keyword(s):  
Cetyl Trimethyl Ammonium Bromide ◽  
Morphological Changes ◽  
Low Cost ◽  
Lead Ions ◽  
Ammonium Bromide ◽  
Porous Hydroxyapatite ◽  
X Ray ◽  
Composition And Structure ◽  
Cetyl Trimethyl Ammonium ◽  
Co Precipitation

In the present study, a new low-cost bioceramic nanocomposite based on porous hydroxyapatite (HAp) and cetyl trimethyl ammonium bromide (CTAB) as surfactant was successfully obtained by a simple chemical co-precipitation. The composition and structure of the HAp-CTAB were characterized by X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, transmission electron microscopy (TEM), scanning electron microscope (SEM) equipped with an energy dispersive X-ray (EDX) spectrometer, and N2 adsorption/desorption analysis. The capacity of HAp-CTAB nanocomposites to remove the lead ions from aqueous solutions was studied by adsorption batch experiments and proved by Langmuir and Freundlich models. The Pb2+ removal efficiency of HAp-CTAB biocomposite was also confirmed by non-destructive ultrasound studies. The cytotoxicity assays showed that the HAp-CTAB nanocomposites did not induce any significant morphological changes of HeLa cells after 24 h of incubation or other toxic effects. Taken together, our results suggests that the obtained porous HAp-CTAB powder could be used for the decontamination of water polluted with heavy metals, such as Pb2+.

scholarly journals Low-temperature combustion of methane over graphene templated Co3O4 defective-nanoplates

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Dian Gong ◽  
Gaofeng Zeng
Keyword(s):  
Low Temperature ◽  
Transition Metal Oxides ◽  
Active Oxygen Species ◽  
Low Cost ◽  
Thermal Reduction ◽  
Low Temperature Combustion ◽  
Solid Catalysts ◽  
Intermittent Feeding ◽  
Co Precipitation ◽  
Catalytic Combustion Of Methane

AbstractTransition metal oxides are the potential catalysts to replace noble-metal based catalyst for the catalytic combustion of methane due to the tolerable reactivity and low cost. However, these catalysts are challenged by the low temperature reactivity. Herein, the surface defective Co3O4 nanoplates are realized through a facile co-precipitation and thermal reduction method with the association of GO. The resultant catalysts (CoGO50) demonstrate a superior low-temperature reactivity for the methane oxidation to CO2 and H2O in comparison with the common Co3O4 catalyst. The reliable stability of CoGO50 catalyst was proved by 80 h testing with intermittent feeding of water vapor. The experimental analysis demonstrates that the presence of a small amount of GO significantly affects the catalysts in surface valence state, active oxygen species and surface oxygen vacancies through reacting with the cobalt oxide as a reductant. Moreover, GO plays as 2D confine template to form smaller and thinner nanoplates. This work provides a facile method to control the surface properties of catalyst not only for Co3O4 based catalysts but also for wider solid catalysts.

scholarly journals Microwave Assisted-Hydrothermal Synthesis of Nickel Ferrite Nanoparticles

2018 ◽  
Vol 34 (5) ◽  
pp. 2577-2582
Author(s):  
Mohamed H. H. Mahmoud ◽  
Mahmoud M. Hessien
Keyword(s):  
Nickel Ferrite ◽  
High Performance ◽  
Fine Particles ◽  
Low Cost ◽  
Nickel Chloride ◽  
Heating Time ◽  
Stoichiometric Ratio ◽  
Microwave Assisted ◽  
Xrd Patterns ◽  
Co Precipitation

Nanomagnetic ferrite materials are of great technological importance in several industries due to their high performance, ease of preparation and low cost. The ferrite properties are based on composition, structure and methods of preparation. Nickel ferrite, NiFe2O4, was prepared by the simple microwave assisted-hydrothermal method. Nickel chloride and ferric chloride solutions (stoichiometric ratio of 1: 2 respectively) were mixed, the pH was raised to 10.5 and the mixture was heated at 180 °C in a closed Teflon vessel using a microwave oven at different periods of time (2 - 24 h). The formed powders were examined by XRD, TEM, and VSM. The intensity of nickel-ferrite in the XRD patterns increased with time owing to increase in crystallinity of the formed phase. The TEM images showed that, the size was in the range of 20-40 nm and contents of fine particles noticeably decreased with increasing reaction time to 4-6 hrs and contents of more regular cubic particles are formed. The NiFe2O4 magnetization was continuesly increased with raising the heating time from 2h (9 emu/g) to 24 h (43 emu/g) which may be due to the high purity and crystallinity of the formed NiFe2O4. The results showed that the properties of the formed ferrite can be tailored by controlling the heating time. Microwave assisted co-precipitation followed by hydrothermal digestion resulted in a substance of good homogeneity and crystallinity at a short time.

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

2018 ◽  
Vol 232-235 ◽  
pp. 48-54 ◽  
Author(s):  
N. Hosni ◽  
K. Zehani ◽  
R. Pires Brazuna ◽  
J. Moscovici ◽  
L. Bessais ◽  
...  
Keyword(s):  
Nickel Ferrite ◽  
Low Cost ◽  
Precipitation Process ◽  
Co Precipitation

scholarly journals Antiviral Effects of Gelatin Stabilized Ferrous Sulfide Nanoparticles

2021 ◽  
Author(s):  
Ting Tong ◽  
Shuangfei Deng ◽  
Xiaotong Zhang ◽  
Liurong Fang ◽  
Jiangong Liang ◽  
...  
Keyword(s):  
Environmental Remediation ◽  
Low Cost ◽  
Antiviral Effect ◽  
High Reactivity ◽  
Host Cells ◽  
Antiviral Effects ◽  
Ferrous Sulfide ◽  
Effective Inhibition ◽  
Co Precipitation ◽  
First Time

Abstract Ferrous sulfide nanoparticles (FeS NPs) are widely applied to environmental remediation, catalysis, energy storage and medicine because of their high reactivity, large specific surface area and low cost, arousing great interest of researchers. However, there is no literature reported on its application in the antiviral field. In the study, gelatin stabilized FeS nanoparticles (Gel-FeS NPs) were synthesized by co-precipitation of Fe2+ and S2‒ in the aqueous phase with continuous stirring under anaerobic conditions. The as-prepared Gel-FeS NPs were good stabilization and dispersibility with the size distribution of 77.7 ± 16.4 nm, as determined by UV-Vis spectrometer, TEM, FTIR, XRD and XPS. We reported for the first time the virucidic and antiviral activity of Gel-FeS NPs. The Gel-FeS NPs with good dispersibility and biocompatibility were synthesized, and they exhibited effective inhibition on the proliferation of PRRSV by blocking the PRRSV outside the host cells. Moreover, the Fe2+ from degraded ferrous sulfide still displayed an antiviral effect, demonstrating the advantage as an antiviral nanomaterial of Gel-FeS NPs compared to other nanomaterials. This work highlighted the antiviral effect of Gel-FeS NPs, broaden the applications of iron-based nanoparticles for combating the virus.

Calorimetry, chemical composition and in vitro digestibility of sugarcane treated with calcium hydroxide

2018 ◽  
Vol 69 (4) ◽  
pp. 406
Author(s):  
Alexandre M. Dias ◽  
Luís C. V. Ítavo ◽  
Júlio C. Damasceno ◽  
Camila C. B. F. Ítavo ◽  
Geraldo T. Santos ◽  
...  
Keyword(s):  
Weight Loss ◽  
Chemical Composition ◽  
Calcium Hydroxide ◽  
Nutritive Value ◽  
Low Cost ◽  
Alkaline Treatment ◽  
In Vitro Digestibility ◽  
Cellulose Structure ◽  
High Dry Matter

Sugarcane is a source of roughage in animal feeding. It presents high production per unit of cultivated area, relatively easy cultivation and low cost of production per hectare, and better quality and a high dry matter (DM) yield in periods when forage is scarce. This study aimed to evaluate the effect of increasing levels of calcium hydroxide (Ca(OH)2) in sugarcane forage on chemical composition, in vitro digestibility values of DM, neutral detergent fibre (NDF) and acid detergent fibre (ADF), and kinetics of thermal decomposition processes of weight loss and heat flow. Sugarcane was collected close to the ground and 50-kg heaps of the fresh material were formed and mixed with four doses of Ca(OH)2 (0, 8, 16 and 24 g kg–1 sugarcane). Concentrations of NDF and ADF decreased linearly with increasing amount of Ca(OH)2, whereas concentration of hemicellulose increased linearly. In vitro digestibilities of DM, NDF and ADF were enhanced in a quadratic manner with increasing amounts of Ca(OH)2. The release of heat, measured by ΔH, increased linearly with increased Ca(OH)2 levels, likely due to enhanced digestibility of the fibre components. Weight loss decreased linearly between 272.2°C and 397.7°C with increased amounts of Ca(OH)2 added to sugarcane, likely due to changes in cellulose structure, which became denser and thermodynamically more stable than native cellulose following the alkaline treatment. Calcium hydroxide changed chemical composition and digestibility of the fibrous fraction of sugarcane, resulting in better nutritional value. The greatest release of heat and highest in vitro digestibility of fibre were observed when adding 15.2 g Ca(OH)2 kg–1 sugarcane; therefore, this dose is recommended to enhance the nutritive value of sugarcane as ruminant feed.

Biological activity of gum Arabic-coated ferrous oxide nanoparticles

2021 ◽  
pp. 2150411
Author(s):  
Rania Hasan Huseen ◽  
Ali A. Taha ◽  
Ihab Q. Ali ◽  
Oday Mahmmod Abdulhusein ◽  
Selma M. H. Al-Jawad
Keyword(s):  
Iron Oxide ◽  
Cell Line ◽  
Biological Activities ◽  
Low Cost ◽  
Gum Arabic ◽  
Precipitation Method ◽  
Oxide Nanoparticles ◽  
Electron Microscopic ◽  
Co Precipitation ◽  
Mcf 7

In this study, iron oxide nanoparticles (NPs) had been prepared by co-precipitation method. In order to reduce their toxicity and increase stability, prepared iron oxide was coated with gum Arabic. Gum Arabic is preferred over synthetic materials due to their non-toxicity, low cost and availability. Characterization of coated and non-coated iron oxide NPs had been performed by spectrophotometer, Fourier transfer infra-red spectrophotometer (FTIR), Zeta potential, X-ray diffraction (XRD) and field emission scanning electron microscopic (FE-SEM). The fabricated nanoparticles appeared purity and crystalline nature by XRD, with diameter average of 27.01 nm and 55.12 nm for iron oxide NPs and iron oxide NPs coated with gum Arabic, respectively. On the other hand, four biological activities of coated and non-coated iron oxide had been investigated. High removal of methylene blue pollutant dye (46%) was observed with iron oxide NPs, while removal percentage was 22.6 performed by iron oxide NPs coated with gum Arabic within 72 h. Iron oxide NPs revealed high inhibition zones of 27.5 nm and 30 mm, at 1000 [Formula: see text]g/ml, against S. aureus and E. coli, respectively, while coated iron oxide NPs with gum Arabic revealed low antibacterial activity against both examined bacteria even when used at 1000 [Formula: see text]g/ml. The hemolytic activity of prepared NPs had been determined. The hemolytic percentage was increased whenever concentrations of nanoparticles increased. Lower hemolytic percentages were 69.76 and 50.98 for iron oxide NPs and iron oxide NPs coated with gum Arabic were observed at a concentration of 250 [Formula: see text]g/ml. Finally, cytotoxic activity was estimated against MCF-7 cell line and normal cell line WRL68 by MTT assay. A decrease in MCF-7 viability to 65.1% was observed when 400 [Formula: see text]g/ml of iron oxide NPs was used, while WRL68 viability was 75.03%. Iron oxide NPs coated with gum Arabic revealed significant reduction in MCF-7 and WRL68 viability to 69.90% and 80.05%, respectively, when 400 [Formula: see text]g/ml of nanoparticles was applied.

A simple, low cost and robust method for measurement of the zero-crossing temperature of an ultralow expansion cavity

2019 ◽  
Vol 52 (45) ◽  
pp. 455104
Author(s):  
Chenhao Wang ◽  
Zhonghua Ji ◽  
Ting Gong ◽  
Dianqiang Su ◽  
Yanting Zhao ◽  
...  
Keyword(s):  
Low Cost ◽  
Robust Method ◽  
Zero Crossing

Nonequilibrium Microstructures for Ag–Ni Nanowires

2015 ◽  
Vol 21 (2) ◽  
pp. 491-497 ◽  
Author(s):  
Rajesh K. Rai ◽  
Chandan Srivastava
Keyword(s):  
Crystalline Phase ◽  
Thermal Processing ◽  
Isothermal Annealing ◽  
Amorphous Matrix ◽  
Phase Evolution ◽  
Peripheral Region ◽  
Axial Region ◽  
Amorphous Phases ◽  
Formation Kinetics ◽  
Nanocrystalline And Amorphous

AbstractThis work illustrates that a variety of nanowire microstructures can be obtained either by controlling the nanowire formation kinetics or by suitable thermal processing of as-deposited nanowires with nonequilibrium metastable microstructure. In the present work, 200-nm diameter Ag–Ni nanowires with similar compositions, but with significantly different microstructures, were electrodeposited. A 15 mA deposition current produced nanowires in which Ag-rich crystalline nanoparticles were embedded in a Ni-rich amorphous matrix. A 3 mA deposition current produced nanowires in which an Ag-rich crystalline phase formed a backbone-like configuration in the axial region of the nanowire, whereas the peripheral region contained Ni-rich nanocrystalline and amorphous phases. Isothermal annealing of the nanowires illustrated a phase evolution pathway that was extremely sensitive to the initial nanowire microstructure.

scholarly journals A Novel Ionic Exchange Membrane Crystallizer to Recover Magnesium Hydroxide from Seawater and Industrial Brines

Membranes ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 303
Author(s):  
Daniele La Corte ◽  
Fabrizio Vassallo ◽  
Andrea Cipollina ◽  
Marian Turek ◽  
Alessandro Tamburini ◽  
...  
Keyword(s):  
Magnesium Hydroxide ◽  
Saline Solution ◽  
Low Cost ◽  
Feed Solution ◽  
Ionic Exchange ◽  
The North ◽  
Novel Technology ◽  
Co Precipitation ◽  
Exchange Membrane ◽  
By Products

A novel technology, the ion exchange membrane crystallizer (CrIEM), that combines reactive and membrane crystallization, was investigated in order to recover high purity magnesium hydroxide from multi-component artificial and natural solutions. In particular, in a CrIEM reactor, the presence of an anion exchange membrane (AEM), which separates two-compartment containing a saline solution and an alkaline solution, allows the passage of hydroxyl ions from the alkaline to the saline solution compartment, where crystallization of magnesium hydroxide occurs, yet avoiding a direct mixing between the solutions feeding the reactor. This enables the use of low-cost reactants (e.g., Ca(OH)2) without the risk of co-precipitation of by-products and contamination of the final crystals. An experimental campaign was carried out treating two types of feed solution, namely: (1) a waste industrial brine from the Bolesław Śmiały coal mine in Łaziska Górne (Poland) and (2) Mediterranean seawater, collected from the North Sicilian coast (Italy). The CrIEM was tested in a feed and bleed modality in order to operate in a continuous mode. The Mg2+ concentration in the feed solutions ranges from 0.7 to 3.2 g/L. Magnesium recovery efficiencies from 89 up to 100% were reached, while magnesium hydroxide purity between 94% and 98.8% was obtained.

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