scholarly journals Synthesis and Characterization of Nano Fe and Mn (hydr)oxides to Be Used as Natural Sorbents and Micronutrient Fertilizers

Agronomy ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1876
Author(s):  
María Teresa Cieschi ◽  
Marina de Francisco ◽  
Paula Herrero ◽  
Jorge Sánchez-Marcos ◽  
Jaime Cuevas ◽  
...  
Keyword(s):  
Point Of Zero Charge ◽  
White Lupin ◽  
X Ray Diffraction ◽  
Iron Chelate ◽  
Mn Oxide ◽  
Fe And Mn ◽  
Wastewater Systems ◽  
Mn Concentration ◽  
Mn Oxides

Fe and Mn (hydr)oxides are widely used as contaminant sorbents in water/wastewater systems but their potential use as micronutrient fertilizers is still poorly known. In this research, four nano-metal (hydr)oxides (amorphous Mn oxide (AMO), Fe-Mn binary oxide (FMBO), two-line ferrihydrite (2L-Fh) and goethite) were successfully synthesized and completely characterized (infrared and Mössbauer spectroscopy, X-ray diffraction particle size, specific surface area, point of zero charge). AMO, FMBO and 2L-Fh were introduced to interact with AgNO3 (20.0 µM) and TlNO3 (100.0 µM) diluted solutions for three days to check their potential capability as potential Ag+ and Tl+ adsorbents. AMO and FMBO (4% w/w) were tested as nanofertilizers by arranging a hydroponic bioassay for 35 days on white lupin culture as a Mn-hyperaccumulator plant model. AMO structure was identified as an amorphous mixture of Mn oxides while FMBO was an Fe dopped birnessite. Both materials were efficient in extracting Ag+ and Tl+ although large Mn concentration was released from FMBO to the solutions. AMO and FMBO promoted Fe and Mn nutrition in plants. Synthetic iron chelate (Fe-EDDHA), present in the nutrient dissolution, could be adsorbed onto AMO surface by producing Fe and Mn accumulation in roots and increasing Mn uptake rate without toxicity symptoms. Therefore, AMO and FMBO not only demonstrated their efficiency as adsorbents, but also displayed they would be promising nanomaterials as micronutrient fertilizers.

scholarly journals MINERALOGICAL AND GEOCHEMICAL CHARACTERIZATION OF THE OLYMPIAS MINE TAILINGS, NE CHALKIDIKI, GREECE

2017 ◽  
Vol 50 (4) ◽  
pp. 2088
Author(s):  
S. Zaimis ◽  
M. Vavelidis ◽  
D. Alifragkis ◽  
V. Melfos ◽  
N. Kantiranis ◽  
...  
Keyword(s):  
Precious Metals ◽  
Thin Layers ◽  
Mine Wastes ◽  
X Ray Diffraction ◽  
Ph Measurements ◽  
Rock Composition ◽  
Geochemical Characterization ◽  
Fe Oxyhydroxides ◽  
Mn Oxides

The Olympias tailings of NE Chalkidiki, Greece represent the mine wastes produced by the beneficiation of the Pb-Zn-Au-Ag ore deposit, which is hosted within the carbonate rocks of the Kerdylia Unit. In the present study X-Ray diffraction (XRD), scanning electron microscopy (SEM), optical microscopy, chemical analyses and pH measurements were conducted to determine the tailings mineralogy and chemical composition. The results indicated that they consist of gangue (quartz, rhodochrosite, calcite, dolomite, feldspars, micas, kaolinite and actinolite) and sulfide minerals (pyrite, arsenopyrite, sphalerite, chalcopyrite and galena), reflecting the source ore and its host rock composition, accompanied by traces of Fe-oxides (magnetite, hematite), Fe oxyhydroxides (goethite) and Mn-oxides, often enriched in Zn and Pb and in some cases Fe, Sb and As. Secondary sulfates (gypsum, jarosite) and surface efflorescent salts (ferrohexahydrite, hexahydrite, halotrichite) have also been recognized. The Olympias tailings are generally unoxidized, generating an alkaline environment. However, variations in composition result in the formation of restricted separate phases, such as thin layers and lenses of oxidized material that generates an acidic environment. In terms of precious metals content, the Olympias tailings are enriched in Au (up to 12 g/t) and Ag (up to 20 g/t).

Fabrication and characterization of KGM-based FMBO-containing aerogels for removal of arsenite in aqueous solution

RSC Advances ◽  
2015 ◽  
Vol 5 (52) ◽  
pp. 41877-41886 ◽  
Author(s):  
Shuxin Ye ◽  
Weiping Jin ◽  
Qing Huang ◽  
Ying Hu ◽  
Bakht Ramin Shah ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Hybrid Materials ◽  
Konjac Glucomannan ◽  
Fe And Mn ◽  
Fabrication And Characterization ◽  
Mn Oxides

Hybrid materials were obtained by immobilizing Fe and Mn oxides (FMBO) into a konjac glucomannan (KGM) based aerogel matrix to remove arsenite from water.

scholarly journals Evaluation of the Sorption Potential of Mineral Materials Using Tetracycline as a Model Pollutant

Minerals ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 453 ◽  
Author(s):  
Jaime Cuevas ◽  
Nisael Dirocie ◽  
Felipe Yunta ◽  
Carlos García Delgado ◽  
Daniel E. González Santamaría ◽  
...  
Keyword(s):  
Exchange Capacity ◽  
Point Of Zero Charge ◽  
Iron Hydroxides ◽  
X Ray Diffraction ◽  
Antibiotic Resistant ◽  
Batch Tests ◽  
Organic Mineral ◽  
Characterization Of Materials ◽  
Low Charge

Tetracycline (TC) is among the most used antibiotics in animal feedstock in the EU. Antibiotics’ persistence as emerging pollutants in the environment is evidenced by their long half-life in residual organic-mineral sediments and waters. The risk associated with this persistence favours antibiotic-resistant microbiota, affecting human health and ecosystems. The purpose of the present work is to assess the adsorption of TC into natural clay minerals, synthetic iron hydroxides and calcined sewage sludge. TC adsorption isotherms were performed in three replicated batch tests at three different pH values (4, 6, 8) and TC concentrations (33–1176 mg·L−1). X-Ray diffraction (XRD) mineralogy, cation exchange capacity (CEC), Brunauer, Emmett and Teller specific surface area (BET-SSA) and point of zero charge salt effect (PZSE) were determined for the characterization of materials. Sorption was analysed by means of fitting Langmuir and Freundlich adsorption models, which showed good fitting parameters for the studied materials. Low-charge montmorillonite (LC Mnt) is displays the best sorption capacity for TC at maximum TC concentration (350–300 mgTC·g−1) in the whole range of pH (4–8). Sepiolite and smectites adsorbed 200–250 mgTC·g−1, while illite, calcined sludge or iron hydroxides present the lowest adsorption capacity (<100 mgTC·g−1). Nevertheless, illite, sepiolite and ferrihydrite display high adsorption intensities at low to medium TC concentrations (<300 mg·L−1), even at pH 8, as is expected in wastewater environmental conditions.

SYNTHESIS AND CHARACTERIZATION OF Mn SUBSTITUTED ZnO NANOPARTICLES

2013 ◽  
Vol 12 (01) ◽  
pp. 1350004 ◽  
Author(s):  
V. D. MOTE ◽  
S. S. SHAH ◽  
B. N. DOLE ◽  
Y. PURUSHOTHAM
Keyword(s):  
Zno Nanoparticles ◽  
Magnetic Measurements ◽  
Average Diameter ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
Hexagonal Crystal ◽  
Tem Analysis ◽  
Co Precipitation ◽  
Mn Concentration

The aim of the work is to synthesize Mn substituted ZnO nanoparticles by co-precipitation method with chemical formula Zn 1-x Mn x O , where x = 0.00, 0.05, 0.10 and 0.15 and to characterize its structural, morphological and magnetic properties. X-ray diffraction studies confirm the presence of wurtzite (hexagonal) crystal structure for doped samples similar to un doped ZnO , indicating that doped Mn replacing Zn . Lattice parameters and unit cell volume were found to increase with increasing Mn concentration, indicating the homogeneous substitution of Mn2+ for Zn2+ . TEM analysis shows the average diameter of the nanoparticles in the range of 20–50 nm. Room temperature magnetic measurements indicate the existence of ferromagnetism in x = 0.00 and 0.05 nanoparticles and co-existence of ferro, para magnetism in x = 0.10 and 0.15 nanoparticles.

X-ray characterization of Mg, Fe, and Mn natural end-members of the axinite group

2000 ◽  
Vol 15 (3) ◽  
pp. 180-188 ◽  
Author(s):  
Gabriella Salviulo ◽  
Giovanni B. Andreozzi ◽  
Giorgio Graziani
Keyword(s):  
Diffraction Data ◽  
Crystal Chemical ◽  
X Ray Diffraction ◽  
Space Group ◽  
X Ray ◽  
Normal Orientation ◽  
Fe And Mn ◽  
Chemical Studies ◽  
End Members

New powder X-ray diffraction data for magnesio-, ferro-, and manganaxinite, obtained from samples closely corresponding to the three end-members of the axinite mineral group, were obtained using a conventional Bragg–Brentano diffractometer. Space group is P 1¯. Powder patterns were indexed using Peacock's normal orientation, which gave: a=7.1381(3), b=9.1626(4), c=8.9421(4) Å, α=91.903(4), β=98.105(3), γ=77.468(4)° for magnesioaxinite; a=7.1479(4), b=9.1962(5), c=8.9576(4) Å, α=91.857(4), β=98.177(4), γ=77.359(4)° for ferroaxinite, and a=7.1849(4), b=9.2152(5), c=8.9765(4) Å, α=91.761(4), β=98.153(4), γ=77.150(4)° for manganaxinite. Peacock's orientation has been adopted in all recent structural and crystal chemical studies of axinite, but it differs from that reported on the JCPDS cards (29-344, 27-076 and 27-084, respectively). New data include an increased number of indexed peaks.

scholarly journals Organobentonite: Characterization and adsorptive properties towards phenol and its derivatives

2016 ◽  
Vol 48 (2) ◽  
pp. 167-176
Author(s):  
Sanja Marinovic ◽  
Marija Ajdukovic ◽  
Natasa Jovic-Jovicic ◽  
Predrag Bankovic ◽  
Zorica Mojovic ◽  
...  
Keyword(s):  
Point Of Zero Charge ◽  
Hexadecyltrimethylammonium Bromide ◽  
Order Kinetic ◽  
X Ray Diffraction ◽  
Phenol Derivatives ◽  
Order Kinetic Model ◽  
Langmuir Isotherm Model ◽  
Pseudo Second Order ◽  
Nitro Derivatives

Bentonite from Mecji Do locality in Serbia was modified with hexadecyltrimethylammonium bromide (HDTMA-Br), and the sample was denoted as HDTMA-MD. The characterization of the material included X-Ray diffraction, elemental analysis and point of zero charge determination. The adsorption of phenol and its nitro derivatives: 2-nitrophenol (2NP), 3-nitrophenol (3NP) and 4-nitrophenol (4NP) on HDTMA-MD was investigated. The adsorption capacity of HDTMA-MD toward phenol derivatives increased in the following order qe (phenol) < qe (3NP) < qe (2NP) < qe (4NP). The influence of adsorption time and initial concentration on the adsorption efficiency of HDTMA-MD was studied for 4NP. The data were best fitted with Langmuir isotherm model and the pseudo-second-order kinetic model.

scholarly journals Preparation and physicochemical properties of the Fe, Mn-oxides catalyst

2021 ◽  
Vol 65 (1) ◽  
pp. 46-51
Author(s):  
A. I. Ivanets
Keyword(s):  
Physicochemical Properties ◽  
Oxide Catalyst ◽  
High Efficiency ◽  
Aqueous Media ◽  
X Ray Diffraction ◽  
X Ray ◽  
Thermally Activated ◽  
Mn Oxide ◽  
Adsorption Desorption ◽  
Mn Oxides

A Fe, Mn-oxide catalyst was obtained by impregnation of thermally activated dolomite granules with aqueous solutions of Fe(III) and Mn(II) sulfates followed by heat treatment. Its physicochemical properties were studied using differential thermal analysis, X-ray diffraction, low-temperature adsorption-desorption of nitrogen, and scanning electron microscopy. The high efficiency of Fe(II) ion oxidation in aqueous media in a flow-type catalytic reactor was shown, which makes the obtained catalyst promising for the deironization of artesian waters.

The Use of Advanced Analytical Techniques for Characterization of the Chemical, Physical, and Crystallographic Nature of a Surface

1973 ◽  
Vol 31 ◽  
pp. 132-133 ◽  
Author(s):  
R. E. Herfert
Keyword(s):  
Surface Characterization ◽  
Analytical Techniques ◽  
X Ray Diffraction ◽  
Depth Of Penetration ◽  
X Ray ◽  
The Past ◽  
Transmission Electron ◽  
Scanning Electron

Studies of the nature of a surface, either metallic or nonmetallic, in the past, have been limited to the instrumentation available for these measurements. In the past, optical microscopy, replica transmission electron microscopy, electron or X-ray diffraction and optical or X-ray spectroscopy have provided the means of surface characterization. Actually, some of these techniques are not purely surface; the depth of penetration may be a few thousands of an inch. Within the last five years, instrumentation has been made available which now makes it practical for use to study the outer few 100A of layers and characterize it completely from a chemical, physical, and crystallographic standpoint. The scanning electron microscope (SEM) provides a means of viewing the surface of a material in situ to magnifications as high as 250,000X.

High Resolution Replication of Organoclay Surfaces

1982 ◽  
Vol 40 ◽  
pp. 576-577
Author(s):  
W. W. Barker ◽  
W. E. Rigsby ◽  
V. J. Hurst ◽  
W. J. Humphreys
Keyword(s):  
Clay Mineral ◽  
Organic Molecule ◽  
Organic Molecules ◽  
X Ray Diffraction ◽  
Xrd Pattern ◽  
X Ray ◽  
Naturally Occurring ◽  
Silicate Layers ◽  
Mineral Identification

Experimental clay mineral-organic molecule complexes long have been known and some of them have been extensively studied by X-ray diffraction methods. The organic molecules are adsorbed onto the surfaces of the clay minerals, or intercalated between the silicate layers. Natural organo-clays also are widely recognized but generally have not been well characterized. Widely used techniques for clay mineral identification involve treatment of the sample with H2 O2 or other oxidant to destroy any associated organics. This generally simplifies and intensifies the XRD pattern of the clay residue, but helps little with the characterization of the original organoclay. Adequate techniques for the direct observation of synthetic and naturally occurring organoclays are yet to be developed.

Synthesis and characterization of TiN / Ti / AISI 410 coatings

2018 ◽  
Vol 2 (1) ◽  
pp. 7
Author(s):  
S Chirino ◽  
Jaime Diaz ◽  
N Monteblanco ◽  
E Valderrama
Keyword(s):  
Synthesis And Characterization ◽  
Photoemission Spectroscopy ◽  
X Ray Diffraction ◽  
X Ray ◽  
Columnar Grains ◽  
Tin Thin Films ◽  
Steel Aisi ◽  
Interacting Surfaces ◽  
Stainless Steel Aisi

The synthesis and characterization of Ti and TiN thin films of different thicknesses was carried out on a martensitic stainless steel AISI 410 substrate used for tool manufacturing. The mechanical parameters between the interacting surfaces such as thickness, adhesion and hardness were measured. By means of the scanning electron microscope (SEM) the superficial morphology of the Ti/TiN interface was observed, finding that the growth was of columnar grains and by means of EDAX the existence of titanium was verified.  Using X-ray diffraction (XRD) it was possible to observe the presence of residual stresses (~ -3.1 GPa) due to the different crystalline phases in the coating. Under X-ray photoemission spectroscopy (XPS) it was possible to observe the molecular chemical composition of the coating surface, being Ti-N, Ti-N-O and Ti-O the predominant ones.

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