Nanosized magnetite has emerged as an adsorbent of pollutants in water remediation. Nanoadsor- bents include magnetic iron oxide and its modifiers/ stabilizers, such as carbon, silica, clay, organic moieties （polymer...Nanosized magnetite has emerged as an adsorbent of pollutants in water remediation. Nanoadsor- bents include magnetic iron oxide and its modifiers/ stabilizers, such as carbon, silica, clay, organic moieties （polymers, aminoaeids, and fatty acids） and other inorganic oxides. This review is focused on the recent developments on the synthesis and use of magnetic nanoparticles and nanocomposites in the treatment of contaminated water. The emphasis is on the influence of the iron oxide modifiers on some properties of interest such as size, BET area, and magnetization. The characteristics of these nanomaterials are related to their ability to eliminate heavy metal ions and dyes from wastewater. Comparative analysis of the actual literature was performed aiming to present the magnetic material, its preparation methodology and performance in the elimination of the selected pollutants. Vast information has been properly summarized according to the materials, their properties and preferential affinity for selected contaminants. The mechanisms governing nanomaterial＇s formation as well as the interactions with heavy metals and dyes have been carefully analyzed and associated to their efficiency.展开更多
Silver(Ag NPs)and magnetite nanoparticles(MANPs)were synthesized and characterized using X-ray powder diffraction(XRD),X-ray fluorescence(XRF),scanning electron microscope(SEM)and transmission electron microscope(TEM)...Silver(Ag NPs)and magnetite nanoparticles(MANPs)were synthesized and characterized using X-ray powder diffraction(XRD),X-ray fluorescence(XRF),scanning electron microscope(SEM)and transmission electron microscope(TEM),atomic force microscope(AFM)and Raman spectroscopy.XRD,XRF and Raman spectroscopy results of MANPs and Ag NPs confirmed their synthesis without any undesired impurities from synthesis method.TEM,SEM and AFM images of Ag NPs illustrated homogenous spherical particles with the size of about 5 nm,while MANPs had spherical to semi-cubic with the size of 20 nm.Both silver-essential oils and magnetite-essential oils nanocomposites were synthesized by sonochemical method with the ratio of 1:1.In-vitro contact effect of commercial plant essential oil mixture with synthetic silver and magnetite nanoparticles was studied.Comparative killing study was carried out by direct contact spray of groups of saline,silver nanoparticles,magnetite nanoparticles,essential oils,silver-essential oil nanocomposite,and magnetite-essential oil nanocomposite on poultry red mite Dermanyssus gallinae(D.gallinae).Activity and changes occurred were examined under stereomicroscope for 3 h.Interestingly,highest killing activity was obtained with silver-essential oil nanocomposite and silver nanoparticles in comparison with magnetite nanoparticles,essential oil and magnetite-essential oil nanocomposite.As a result,silver-essential oil nanocomposite and silver nanoparticles could be beneficial and involved in D.gallinae(red mite)control strategies in poultry industry.展开更多
文摘Nanosized magnetite has emerged as an adsorbent of pollutants in water remediation. Nanoadsor- bents include magnetic iron oxide and its modifiers/ stabilizers, such as carbon, silica, clay, organic moieties （polymers, aminoaeids, and fatty acids） and other inorganic oxides. This review is focused on the recent developments on the synthesis and use of magnetic nanoparticles and nanocomposites in the treatment of contaminated water. The emphasis is on the influence of the iron oxide modifiers on some properties of interest such as size, BET area, and magnetization. The characteristics of these nanomaterials are related to their ability to eliminate heavy metal ions and dyes from wastewater. Comparative analysis of the actual literature was performed aiming to present the magnetic material, its preparation methodology and performance in the elimination of the selected pollutants. Vast information has been properly summarized according to the materials, their properties and preferential affinity for selected contaminants. The mechanisms governing nanomaterial＇s formation as well as the interactions with heavy metals and dyes have been carefully analyzed and associated to their efficiency.
文摘Silver(Ag NPs)and magnetite nanoparticles(MANPs)were synthesized and characterized using X-ray powder diffraction(XRD),X-ray fluorescence(XRF),scanning electron microscope(SEM)and transmission electron microscope(TEM),atomic force microscope(AFM)and Raman spectroscopy.XRD,XRF and Raman spectroscopy results of MANPs and Ag NPs confirmed their synthesis without any undesired impurities from synthesis method.TEM,SEM and AFM images of Ag NPs illustrated homogenous spherical particles with the size of about 5 nm,while MANPs had spherical to semi-cubic with the size of 20 nm.Both silver-essential oils and magnetite-essential oils nanocomposites were synthesized by sonochemical method with the ratio of 1:1.In-vitro contact effect of commercial plant essential oil mixture with synthetic silver and magnetite nanoparticles was studied.Comparative killing study was carried out by direct contact spray of groups of saline,silver nanoparticles,magnetite nanoparticles,essential oils,silver-essential oil nanocomposite,and magnetite-essential oil nanocomposite on poultry red mite Dermanyssus gallinae(D.gallinae).Activity and changes occurred were examined under stereomicroscope for 3 h.Interestingly,highest killing activity was obtained with silver-essential oil nanocomposite and silver nanoparticles in comparison with magnetite nanoparticles,essential oil and magnetite-essential oil nanocomposite.As a result,silver-essential oil nanocomposite and silver nanoparticles could be beneficial and involved in D.gallinae(red mite)control strategies in poultry industry.
