oxidation of bentonite

US20060076299A1 - Synthesis of bentonite clay-based iron ...

The present invention provides a method of synthesizing bentonite clay-based Fe nanocomposite, that may be used as a heterogeneous photo Fenton catalyst in advanced oxidation processes (AOP's) for wastewater treatment.

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Trends in the use of bentonite clays - ResearchGate

Bentonite clay was a poor adsorbent of atrazine as 9.4 % adsorption was observed at 1 μg mL−1 atrazine concentration. Modification of clay by PTMA cation did not improve atrazine adsorption ...

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Effect of Humic Acid Binder on Oxidation Roasting of ...

The oxidation roasting of vanadium–titanium magnetite (VTM) pellets with a new composite binder was investigated using a pilot-scale straight-grate. The evolution of the chemical and phase composition, the compressive strength, and the metallurgical properties of the fired VTM pellets were investigated. Under a preheating temperature of 950 ∘C, a preheating time of 18 min, a firing ...

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ChemInform Abstract: Oxidation of Benzylic and Allylic ...

ChemInform Abstract: Oxidation of Benzylic and Allylic Alcohols by the System MnO2/ Bentonite Under Irradiation with Microwaves or Ultrasound in the Absence of a Solvent. L. A. MARTINEZ Inst. Quim.‐UNAM, Circuito Exterior, Univ., Coyoacan 04510, D. F. Mex.

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Synthesis of CdS‐ and ZnS‐modified bentonite nanoparticles ...

M. Ghiaci, M. Mostajeran, A. Gil, Synthesis and Characterization of Co–Mn Nanoparticles Immobilized on a Modified Bentonite and Its Application for Oxidation of p -Xylene to Terephthalic Acid, Industrial & Engineering Chemistry Research, 10.1021/ie3021939, …

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Efficiency of Sulfur-Bentonite Granules to Improve Uptake ...

However, inefficient sulfur oxidation in soils is a limiting factor for this response. Mixing elemental sulfur with bentonite mineral can increase oxidation of sulfur since bentonite provides the sulfur particles with a better dispersion condition following absorption of water. Purpose of this study is to evaluate the efficie

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Activation of Jordanian Bentonite by Hydrochloric Acid and ...

Jordanian bentonite was activated by hydrochloric acid at room temperature. FTIR, XRD, TGA, and BET surface area analyses of the samples were carried out to examine the structure of bentonite before and after acid activation. It is found that the octahedral cations were removed, which altered the chemical composition of the bentonite. Difference of surface area was noticed (66.2 to …

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Activation conditions of bentonite supports over gold ...

It was investigated the lactic acid production by glycerol oxidation using % 1 Au/bentonite catalysts in alkaline medium. The reactions were performed in a 100 mL volume three-necked and round-bottomed flask placed in an oil bath over a period of 4 h at 90 °C reaction temperature and atmospheric pressure. 1 wt% Au based bentonite catalysts were prepared by incipient to …

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Activation conditions of bentonite supports over gold ...

12%It was investigated the lactic acid production by glycerol oxidation using % 1 Au/bentonite catalysts in alkaline medium. The reactions were performed in a 100 mL volume three-necked and round-bottomed flask placed in an oil bath over a period of 4 h at 90 °C reaction temperature and atmospheric pressure. 1 wt% Au based bentonite catalysts were prepared by …

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A novel layer-layer crossed structure of bentonite/g-C3N4 ...

In this work, a novel 2-dimentional (2D)-2D bentonite/g-C 3 N 4 composite (B/g-C 3 N 4), with a layer-layer cross structure and large surface area, was synthesized by a self-assembly process, with the aim for the photocatalytic oxidation of arsenic (As(III)) in wastewater.The structure and properties of the mineral-based composite were characterized by X-ray diffraction (XRD), infrared ...

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Mechanisms of Advanced Oxidation Processing on Bentonite ...

Advanced oxidation was utilized by Wang et al. (2005h) to reduce the bentonite consumption in foundry where AO water displaced the carbon coating of pyrolyzed carbonaceous condensates that ...

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BENTONE, BARAGEL rheological additives

montmorillonite (commonly called bentonite) type has a central layer of substituted aluminum oxide and has approximate dimensions of 8,000 x 8,000 x 10Å. The other clay type used is hectorite, which has a central layer composed of substituted magnesium oxide and has approximate dimensions of 8,000 x …

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Bentonite | AMERICAN ELEMENTS

Bentonite is an adsorbent clay material composed of hydrated aluminum oxide and silicon oxide that can be used as a drying agent. Bentonite is generally immediately available in most volumes, including bulk orders.. Ultra high purity and high purity compositions improve both optical quality and usefulness as scientific standards.

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Sn–bentonite-induced Baeyer–Villiger oxidation of 2 ...

12%A tin ion-exchanged bentonite seems to be a rather efficient and highly selective catalyst for Baeyer–Villiger oxidation of 2-heptylcyclopentanone to δ-dodecalactone using aqueous hydrogen peroxide (35 wt%) as a clean oxidant. The bentonite-supported tin catalyst was characterized by IR spectroscopy, X-ray diffraction spectroscopy, and scanning electron microscopy. …

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Regeneration Feasibility of Bentonite by Sodium Persulfate ...

However, the ability of SPS to degrade adsorbed to bentonite through oxidation process does remain uncertain. Instead of regeneration, flocculation of -loaded bentonite upon addition of SPS occurred to remove the dye effectively. For reusability study, the -loaded bentonite can be used up to 3 cycles with percentage removal of 95%.

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Adsorption of antimony(III) and antimony(V) on bentonite ...

The desorption of Sb adsorbate on the bentonite was observed following Sb(III) adsorption, probably due to the oxidation of Sb(III) on the bentonite surface and subsequent desorption of Sb(V). In addition, oxidation of Sb(III) can occur in the solution medium also, which decreases the concentration of Sb(III) in the solution thereby driving the ...

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Freshprotect | Scott Laboratories

For treatment of oxygen sensitive musts Freshprotect is a proprietary IOC blend of polyvinylpolypyrrolidone (PVPP), bentonite, gum arabic and micropulverized cellulose. It was specifically formulated to help minimize problems associated with the oxidation of polyphenols including color, bitterness and herbaceousness. These characteristics are significantly improved with the use of …

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Deposition of Al-Fe pillared bentonites and gold supported ...

The pillared bentonite presents a low CO oxidation activity, 9% of CO conversion at 400 °C. As earlier reported, the activity of the pillared bentonites without gold in this reaction is very low and depends on the type and concentration of the metallic atoms introduced in the clay during the pillaring process, being the natural clay almost ...

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Sol-gel synthesis of new ZnFe2O4/Na-bentonite composites ...

The photocatalytic efficiency of ZnFe 2 O 4 /Na-bentonite calcined at different temperature was carried out by treating the RhB, with Na-bentonite and ZnFe 2 O 4 as comparison under visible light. After reaching adsorption equilibrium ( Fig. 8 (a)) (30min in dark), ZnFe 2 O 4 /Na-bentonite composites adsorbed more than 40% of RhB while the ...

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(PDF) Removal of Arsenic From Wastewater Using Bentonite

There is a variety of materials in treatment of arsenic contaminated groundwater such as bentonite [27], red mud [7], kaolinite [17], laterite [1] and raw laterite [23]. Raw laterite is an ...

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Is There a Difference Between Elemental Sulphur and ...

It has significantly larger particle sizes and a much slower oxidation rate as compared to sulphur pastilles containing bentonite clay. It is the larger particle sizes in elemental sulphur that require months to a year or longer for the oxidation process to occur (Fig. 2). Elemental sulphur is sometimes utilized as a nutrient source/soil amendment.

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Conversion of glycerol to lactic acid over Au/bentonite ...

The oxidation of glycerol into lactic acid using 1 wt% Au/bentonite as heterogeneous catalyst was studied. Several reaction parameters were evaluated: catalyst reduction, oxygen presence, catalyst amount, hydroxide type and NaOH/glycerol molar ratio and reaction time. The textural and structural properties of the bentonite supported Au catalysts were evaluated by XRD, SEM and ICP. …

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Bentonite - Wikipedia

Bentonite (/ ˈ b ɛ n. t ə ˌ n aɪ t /) is an absorbent swelling clay consisting mostly of montmorillonite.It usually forms from weathering of volcanic ash in seawater, which converts the volcanic glass present in the ash to clay minerals. Bentonite beds are white or pale blue or green in fresh exposures, turning to a cream color and then yellow, red, or brown as the exposure is weathered ...

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Synthesis and spectroscopic analysis of polydiphenylamine ...

Synthesis and spectroscopic analysis of polydiphenylamine via oxidation with bentonite clay in the solid state Spectrochim Acta A Mol Biomol Spectrosc . 2015 Dec 5;151:80-8. doi: 10.1016/j.saa.2015.06.092.

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Oxidation of alcohols with tert-butylhydroperoxide ...

3. Results and discussion3.1.. Oxidation of cyclohexanol with TBHPIn general, zeolite encapsulated metal ion complexes are active for oxidation of alcohols .We decided to investigate the effect of cobalt(II) complexes with different chelate N,N; N,O; O,O donor atoms, immobilized between silicate layers of bentonite in the oxidation of alcohols with TBHP.

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System and method for rapid beneficiation of Bentonite ...

Beneficiation of bentonite clay by oxidation of ferrous iron in the bentonite crystal under moist conditions is shown by the graphs of FIGS. 2 through 4. FIG. 2 shows curves of swelling pressure P i versus the mass ratio of water to clay M w /M c for oxidized and reduced Upton clay, which clay has a relatively low iron content.

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Effect of Humic Acid Binder on Oxidation Roasting of ...

A pilot-scale straight-grate experiment used for the oxidation roasting of vanadium–titanium magnetite concentrates showed that the replacement of a bentonite binder with HA binder was feasible. Using 0.75 wt% HA binder instead of 1.5 wt% bentonite binder resulted in fired VTM pellets with better metallurgical properties and 0.97% higher ...

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Use of Bentonite and Organic Binders in the Briquetting of ...

Bentonite favors the sintering mechanisms occurring between the particles. The organic binders decompose thermally and carbon remains, which prevents sintering. ... (HBI) to decrease its oxidation tendency when exposed to air and to prepare it for transportation to and further processing in steel plants electric arc furnace (EAF).

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Bentonite - Wikipedia

Bentonite (/ ˈ b ɛ n t ə n aɪ t /) is an absorbent swelling clay consisting mostly of montmorillonite.It usually forms from weathering of volcanic ash in seawater, which converts the volcanic glass present in the ash to clay minerals. Bentonite beds are white or pale blue or green in fresh exposures, turning to a cream color and then yellow, red, or brown as the exposure is weathered further.

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Regeneration Feasibility of Bentonite by Sodium Persulfate

adsorbed to the surface to recover bentonite after use. However, an intrinsic short coming of oxidation by heated persulfate is the necessity of an energy consuming thermal bed (30 - 99 °C). Accordingly, it is of practical importance to find out the optional operational parameters for the oxidation of each compound or class of compounds.

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Catalytic activity of Pd(II) and Cu(II) complexes anchored ...

bentonite, such supported metal complexes have different catalytic properties in the reaction of carbon monoxide oxidation. When the reaction proceeded in a steady-state mode, the maximum carbon monoxide oxidation yield (87 %) was observed for natural bentonite …

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Effect of Carbon Deposition on the Oxidation Rate of ...

To clarify the oxidation mechanism of Cu2O to CuO, Cu2O oxidation was studied at 600–1050 °C under 1atm O2. The Cu2O specimens were prepared through completely oxidizing 99.99999 and …

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Preparation and 1500 °C oxidation behavior of crack-free ...

Bentonite is doped in MoSi 2 coating to reduce the mismatch of CTE.. The bentonite-containing coating exhibits dense and crack-free morphologies after SPS. • Low growth rate of Mo 5 Si 3 diffusion layer during oxidation is acquired by MoSi 2-bentonite coating.. The composite coating possesses continuous and complete SiO 2 oxide scale with improved anti-oxidation properties.

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(PDF) OXIDATION OF ALCOHOLS WITH TERT …

Paper: OXIDATION OF ALCOHOLS WITH TERT-BUTYLHYDROPEROXIDE CATALYZED BY CO(II) COMPLEXES IMMOBILIZED BETWEEN SILICATE LAYERS OF BENTONITE Author(s): PEYROVI M.H.*, MAHDAVI V., SALEHI S.M.A., MAHMOODIAN R. * Department of Chemistry, Shahid Beheshti University, Evin, Tehran, Iran Abstract: The oxidation of alcohols with tert-butylhydroperoxide ...

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Mechanisms of Advanced Oxidation Processing on Bentonite ...

advanced oxidation (AO) process is employed in a green sand system, the foundry needs 20-35% less makeup bentonite clay than when AO is not employed. We herein sought to explore the mechanism of this enhancement and found that AO water displaced the carbon coating of pyrolyzed carbonaceous condensates that otherwise accumulated on the bentonite ...

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Impact of clay mineral on air oxidation of PAH ...

12%This work investigated the impact of a clay mineral (bentonite) on the air oxidation of the solvent extractable organic matters (EOMs) and the PAHs from contaminated soils. EOMs were isolated from two coking plant soils and mixed with silica sand or bentonite. These samples, as well as raw soils and bentonite/soil mixtures, were oxidized in air at 60 and 100 °C for 160 days. …

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Synthesis of Bi2WO6/Na-bentonite composites for ...

Novel Bi2WO6/bentonite (denoted as BWO/BENT) composites were prepared via a typical hydrothermal process and employed for the photocatalytic oxidation of arsenic(III) (As(III)). The properties of the prepared samples were characterized through X-ray diffraction, transmission and scanning electron microscopy, UV-visible diffuse reflectance spectroscopy, X-ray photoelectron spectroscopy, and ...

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Removal of Heavy Metals Using Bentonite Clay and Inorganic ...

The formation of CO 2 from the decomposition of dolomite is inevitable, including oxidation of metals and other physico-chemical reactions. These form the main chemical reactions occurring in the bentonite clay in the system to form new simple compounds suitable for …

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