scholarly journals Stability of metal oxide nanoparticles in aqueous solutions

2010 ◽  
Vol 61 (1) ◽  
pp. 127-133 ◽  
Author(s):  
Chih-ping Tso ◽  
Cheng-min Zhung ◽  
Yang-hsin Shih ◽  
Young-Ming Tseng ◽  
Shian-chee Wu ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Aqueous Solutions ◽  
Human Health ◽  
Metal Oxide Nanoparticles ◽  
Chemical Properties ◽  
Oxide Nanoparticles ◽  
High Concentration ◽  
Organic Matters ◽  
The Stability ◽  
Micrometer Size

The application of nanoparticles in the processes of making commercial products has increased in recent years due to their unique physical and chemical properties. With increasing amount of commercial nanoparticles released into nature, their fate and effects on the ecosystem and human health are of growing concern. This study investigated the stability and morphology of three metal oxide nanoparticles in aqueous solutions. The commercially available nanoparticles, TiO2, ZnO, SiO2, aggregated quickly into micrometer-size particles in aqueous solutions, which may not threaten human health. Their changes in morphology and characteristics were further examined by dynamic light scattering (DLS) method and transmission electron microscopy (TEM). Among the several dispersion approaches, ultrasonication was found to be the most effective for disaggregating nanoparticles in water. For these three selected nanoparticles, ZnO could not remain stable in suspensions, presumably due to the dissolution of particles to form high concentration of ions, resulting in enhanced aggregation of particles. In addition, the existence of dissolved organic matters stabilized nanoparticles in lake water and wastewater for several hours in spite of the high concentration of cations in these real-water samples. The fate of metal oxide nanoparticles in natural water bodies would be determined by the type and concentration of cations and organic matters. Results obtained in this study revealed that the stability of nanoparticles changed under different aqueous conditions and so did their fate in the environment.

scholarly journals Metal Oxide Nanoparticles and their Nanocomposite-based Materials as Photocatalysts in the Degradation of Dyes

2021 ◽  
Vol 12 (5) ◽  
pp. 6557-6579
Keyword(s):  
Metal Oxide ◽  
Anthropogenic Activities ◽  
Metal Oxide Nanoparticles ◽  
Chemical Properties ◽  
Cost Effective ◽  
Oxide Nanoparticles ◽  
Synthetic Dyes ◽  
Characterization Methods ◽  
Degradation Of Dyes ◽  
Physical And Chemical

The introduction of inorganic and organic pollutants into water bodies has become a serious issue globally. The waste streams released from the textile, plastic, leather, paper, pharmaceutical, and food industries introduce different natural and synthetic dyes into the aquatic system. Nanomaterials play a significant role in the photocatalytic degradation of dyes present in wastewater. Inorganic metal oxide nanoparticles have many improved physical and chemical properties and attracted much attention in photocatalytic activities. Dyes have been released in our aquatic bodies due to many anthropogenic activities and caused life-threatening problems. Various conventional methods were reported to remove dyes from water and wastewater; the photocatalytic method is one of the efficient and cost-effective. The present review article includes detailed information on photocatalysis, the potential of metal oxide and their composite materials as photocatalysts in the degradation of toxic dyes, and some common synthetic and characterization methods used for metal oxide-based nanoparticles.

scholarly journals Green Synthesis, Characterization & Antibacterial Studies of Silver (Ag) and Zinc Oxide (Zno) Nanoparticles

2020 ◽  
Vol 14 (3) ◽  
pp. 1999-2008
Author(s):  
H. Syed Jahangir ◽  
T. Tamil Kumar ◽  
M. Mary Concelia ◽  
R. Alamelu
Keyword(s):  
Zinc Oxide ◽  
Metal Oxide ◽  
Green Synthesis ◽  
Zno Nanoparticles ◽  
Size Structure ◽  
Metal Oxide Nanoparticles ◽  
Chemical Properties ◽  
Oxide Nanoparticles ◽  
Zno Nps ◽  
Leaf Extracts

Green synthesis nanoparticles were considered as an alternative effective resource instead of chemically engineered metal oxide nanoparticles. Using leaf extracts for green synthesis, essential for the reduction and oxidation process of the metals. Phyllanthus niruri (L.) and Aristolochia indica (L.) leaf extracts were used to synthesize yellowish brown coloured silver (Ag) and white coloured zinc oxide (ZnO) nanoparticles. Synthesized green nanoparticles characterized by different spectroscopic analysis (XRD, XPS, FTIR, PL) and TEM. Characterization results confirmed the particles morphology, size, structure and also their optical and photonic properties. Three different concentrations of Ag and ZnO NPs were analysed against three (gram positive) and five (gram negative) bacteria. Increased levels of green synthesized Ag and ZnO NPs showed increased zone of inhibition than amoxicillin (positive control). Our study proved that the green synthesized Ag and ZnO NPs showed similar unique physical and chemical properties with metal oxide nanoparticles but less toxic while their discharge into the ecosystem.

scholarly journals Effect of Metal Oxide Nanoparticles on Plant Enzymatic Activities Under Drought

2021 ◽  
Author(s):  
Esfandiar Jahantab ◽  
Jalil Farzadmehr ◽  
Nikoo Abadi ◽  
Habib Yazdanshenas
Keyword(s):  
Metal Oxide ◽  
Metal Oxide Nanoparticles ◽  
Cadmium Oxide ◽  
Foliar Spray ◽  
Life Forms ◽  
Enzymatic Activities ◽  
Oxide Nanoparticles ◽  
High Concentration ◽  
Zno Nps ◽  
Plant Life

Abstract The aim of this work was to study the effect of metal oxide nanoparticles (MO NPs) on enzymatic activities (EAs) of two main plant life forms under drought stress (DS). Foliar spray of silver oxide (AgO), iron oxide (FeO), zinc oxide (ZnO) and cadmium oxide (CdO) at levels of 30, 60, 90 and 120 mg.L-1 were used on aerial parts of forb Sanguisorba officinalis L. and grass Agropyron cristatum (L.) Gaertn. under DS levels of 25-100% field capacity (FC). Glutathione reductase (GR), catalase (CAT), peroxidase (POD) and superoxide dismutase (SOD) were measured after two weeks of the experiment. The results indicate that the EAs changes varied depending on the plant life form, levels of DS, type and levels of NPs. Overall, application of 30- 60 mg.L-1 MO NPs under 25-50%FC significantly reduced EAs, especially in forb (P<0.001). Higher concentration of MO NPs significantly increase EAs. A decrease in CAT (20.90%, 18.80%), POD (21.30%, 17.67%) and SOD (23.14%, 16.88%) was observed under levels of 60 mg.l-1 of ZnO NPs under 25-50%FC in forb and grass, respectively. High concentration of CdO NPs (90-120 mg.l-1) caused by increase (max= 24.0%) in EAs in both life forms under 25%FC.

Nano-QSAR modeling for predicting the cytotoxicity of metal oxide nanoparticles using novel descriptors

RSC Advances ◽  
2016 ◽  
Vol 6 (31) ◽  
pp. 25766-25775 ◽  
Author(s):  
Yong Pan ◽  
Ting Li ◽  
Jie Cheng ◽  
Donatello Telesca ◽  
Jeffrey I. Zink ◽  
...  
Keyword(s):  
Adverse Effects ◽  
Metal Oxide ◽  
Human Health ◽  
Metal Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Qsar Modeling ◽  
Computational Approaches

Computational approaches have evolved as efficient alternatives to understand the adverse effects of nanoparticles on human health and the environment.

scholarly journals A GREEN STRATEGY TO SYNTHESIZE ENVIRONMENT FRIENDLY METAL OXIDE NANOPARTICLES FOR POTENTIAL APPLICATIONS – A REVIEW

2017 ◽  
Vol 10 (13) ◽  
pp. 337
Author(s):  
G. Vinitha ◽  
P Vani ◽  
N Manikandan
Keyword(s):  
Metal Oxide ◽  
Metal Oxide Nanoparticles ◽  
Chemical Properties ◽  
Oxide Nanoparticles ◽  
Potential Candidate ◽  
Aerospace Medicine ◽  
Energy And Environment ◽  
Potential Applications ◽  
New Research ◽  
Physical And Chemical

Chemical reducing and capping reagents are largely used in synthesizing metal oxide nanoparticles which limits the biomedical applications. Researchers have recently found out the eco-friendly technique of green synthesis which enhances the unique physical and chemical properties of nanomaterials. In this critique, we discuss green route to synthesize metal oxide nanoparticles and its significant applications in various fields of energy and environment, aerospace, medicine, biotechnology, etc.This study arouses to provoke new research design of approach to synthesize nanoparticles for various technological applications. In this review, most of the metal oxides nanoparticles with different plant extract with enhanced properties for its potential applications are discussed which confirms plant extracts as a potential candidate to be used as reducing and capping agent.

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