scholarly journals Effects of Metal Ions, Metal, and Metal Oxide Particles on the Synthesis of Hydrochars

ACS Omega ◽  
2020 ◽  
Vol 5 (11) ◽  
pp. 5601-5607
Author(s):  
Vahid Saadattalab ◽  
Xia Wang ◽  
Anthony E. Szego ◽  
Niklas Hedin
Keyword(s):  
Metal Oxide ◽  
Metal Ions ◽  
Oxide Particles

Coating of uniform inorganic particles with polymers: III. Polypyrrole on different metal oxides

1995 ◽  
Vol 10 (5) ◽  
pp. 1327-1336 ◽  
Author(s):  
Chin-Lin Huang ◽  
Egon Matijevic
Keyword(s):  
Metal Oxide ◽  
Metal Ions ◽  
Metal Oxides ◽  
Dissolution Process ◽  
Reductive Dissolution ◽  
Inorganic Particles ◽  
Ethanol Medium ◽  
Oxide Particles ◽  
Coated Spheres

Five kinds of uniform metal oxide particles (α-Fe2O3, CeO2, CuO, NiO, and SiO2) were coated with polypyrrole by reacting the dispersed solids with pyrrole in a water/ethanol medium without the use of a soluble oxidant. When the process was carried out in air, all particles were coated with the polymer, although the thickness of the layer varied on different cores. In CuO dispersions, independent polypyrrole particles were produced in addition to coated spheres. While oxygen is the major oxidant that initiates the polymerization of pyrrole, some metal oxides may also affect the reaction both in terms of the amount and the composition of the shell. Thus, α-Fe2O3 and SiO2 were found to be inactive in the polymerization, while CeCh and CuO react with the adsorbed pyrrole molecules through a reductive-dissolution process, in which the monomers are oxidized, causing a release of reduced metal ions.

scholarly journals The Model of Metal Oxide Particle Formation from Water Solutions of Salts

2010 ◽  
Vol 4 (2) ◽  
pp. 95-100 ◽  
Author(s):  
Volodymyr Kislenko ◽  
◽  
Liliya Oliynyk ◽  
Svyatoslav Ivanyshyn ◽  
◽  
...  
Keyword(s):  
Metal Oxide ◽  
Metal Ions ◽  
Metal Complexes ◽  
Oxide Particle ◽  
Ionization Constants ◽  
Primary Metal ◽  
Metal Hydroxides ◽  
Water Solutions ◽  
Inorganic Acids ◽  
Oxide Particles

The model describing the formation of metal oxide particles from water solutions of salts was suggested. Dependence of instability constants of metal complexes and ionization constants of oxygen containing inorganic acids on the electron density upon the central ion or atom allows to calculate these values for metal hydroxides. Equations describing the number of metal ions in polyion, the concentration of polyions in solution, the number of metal ions in primary metal oxide particles and their concentration in the system were suggested.

Reusability of metals/metal oxide coupled zinc oxide nanorods in degradation of rhodamine B dye

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Anh Thi Le ◽  
Swee-Yong Pung
Keyword(s):  
Metal Oxide ◽  
Metal Ions ◽  
Rhodamine B ◽  
Zno Nanorods ◽  
Zinc Oxide Nanorods ◽  
Uv Exposure ◽  
Precipitation Method ◽  
Subsequent Stage ◽  
Content Type ◽  
Metal Metal

Purpose This paper aims to investigate the reusability of metal/metal oxide-coupled ZnO nanorods (ZnO NRs) to degrade rhodamine B (RhB). Design/methodology/approach ZnO NRs particles were synthesized by precipitation method and used to remove various types of metal ions such as Cu2+, Ag+, Mn2+, Ni2+, Pb2+, Cd2+ and Cr2+ ions under UV illumination. The metal/metal oxide-coupled ZnO NRs were characterized by scanning electron microscope, X-ray diffraction and UV-Vis diffuse reflectance. The photodegradation of RhB dye by these metal/metal oxide-coupled ZnO NRs under UV exposure was assessed. Findings The metal/metal oxide-coupled ZnO NRs were successfully reused to remove RhB dye in which more than >90% of RhB dye was degraded under UV exposure. Furthermore, the coupling of Ag, CuO, MnO2, Cd and Ni particles onto the surface of ZnO NRs even enhanced the degradation of dye. The dominant reactive species involved in the degradation of RhB dye were •OH- and •O2−-free radicals. Research limitations/implications The coupling of metal/metal oxide onto the surface of ZnO NRs after metal ions removal could affect the photocatalytic performance of ZnO NRs in the degradation of organic pollutants in subsequent stage. Practical implications A good reusability performance of metal/metal oxide-coupled ZnO NRs make ZnO NRs become a desirable photocatalyst material for the treatment of wastewater, which consists of both heavy metal ions and organic dyes. Originality/value Metal/metal oxide coupling onto the surface of ZnO NRs particles improved subsequent UV-assisted photocatalytic degradation of RhB dye.

ChemInform Abstract: Synthesis of Nanoscale Metal Oxide Particles Using Laser Vaporization/ Condensation in a Diffusion Cloud Chamber.

ChemInform ◽  
2010 ◽  
Vol 25 (30) ◽  
pp. no-no
Author(s):  
M. S. EL-SHALL ◽  
W. SLACK ◽  
W. VANN ◽  
D. KANE ◽  
D. HANLEY
Keyword(s):  
Metal Oxide ◽  
Cloud Chamber ◽  
Laser Vaporization ◽  
Oxide Particles

KINETICS OF THIN OXIDE FILM GROWTH ON METAL CRYSTALS

2000 ◽  
Vol 07 (01n02) ◽  
pp. 135-139 ◽  
Author(s):  
V. P. ZHDANOV ◽  
P. R. NORTON
Keyword(s):  
Oxide Film ◽  
Metal Oxide ◽  
Metal Ions ◽  
Film Growth ◽  
Phase Interface ◽  
Oxide Interface ◽  
Thin Oxide Film ◽  
Thin Oxide Films ◽  
Thin Oxide ◽  
Kinetics Of

A seminal model describing the kinetics of growth of thin oxide films on metal crystals was proposed by Cabrera and Mott (CM). The model is based on the assumption that the growth is limited by the field-facilitated activated jumps of metal ions located in steps on the metal–oxide interface. We generalize the CM model by (i) exploring the interplay of jumps of metal ions from the step and terrace sites at the metal–oxide interface, and (ii) scrutinizing the processes at the oxide–gas-phase interface. The former factor is found to change the physical meaning of the parameters in the CM growth law. The latter factor results in modification of the growth law. In particular, the oxidation kinetics becomes dependent on the O2 pressure. More specifically, the oxidation rate is predicted to increase with increasing pressure. This effect is, however, rather weak and becomes progressively weaker with increasing oxide film thickness.

scholarly journals Facile meltPEGylation of flame-made luminescent Tb3+-doped yttrium oxide particles: hemocompatibility, cellular uptake and comparison to silica

2018 ◽  
Vol 54 (23) ◽  
pp. 2914-2917 ◽  
Author(s):  
Kerda Keevend ◽  
Guido Panzarasa ◽  
Fabian H. L. Starsich ◽  
Martin Zeltner ◽  
Anastasia Spyrogianni ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Yttrium Oxide ◽  
Cellular Uptake ◽  
Metal Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
One Pot ◽  
Oxide Particles

MeltPEGylation constitutes an elegant one-pot route for the efficient PEGylation of metal oxide nanoparticles with improved hemo- and cytocompatibility.

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