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Wednesday, November 25, 2020 | History

2 edition of Adsorption of aqueous silicate on hematite found in the catalog.

Adsorption of aqueous silicate on hematite

Taylor, Peter

Adsorption of aqueous silicate on hematite

  • 261 Want to read
  • 24 Currently reading

Published by Whiteshell Laboratories in Pinawa, Man .
Written in English

    Subjects:
  • Hematite.,
  • Iron oxides -- Absorption and adsorption.,
  • Silicates -- Absorption and adsorption.

  • Edition Notes

    Other titlesAdsorption du silicate aqueux sur l"hématite
    Statementby Peter Taylor and Kenneth V. Ticknor.
    SeriesAECL -- 11809, AECL (Series) -- 11809.
    ContributionsTicknor, K. V., Atomic Energy of Canada Limited., Whiteshell Laboratories.
    Classifications
    LC ClassificationsQD181.S6 T39 1997
    The Physical Object
    Pagination14 p. :
    Number of Pages14
    ID Numbers
    Open LibraryOL19903352M
    ISBN 100660171228

      The results of the adsorption isotherm studies suggested that As(III) adsorption can be well described by both the Freundlich and Langmuir equations. The adsorption of As(III) on Fe-HT reached equilibrium within 24 h, and the adsorption kinetic data fit the pseudo-second-order kinetic model better than the pseudo-first-order by: 5. both the mesoporous silicate surface and the protein surface to improve adsorption and catalytic activity have been explored with a view to generate a stable biocatalyst. A biocatalyst has been generated through the tailored adsorption of a tagged enzyme onto a .


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Adsorption of aqueous silicate on hematite by Taylor, Peter Download PDF EPUB FB2

COVID Resources. Reliable information about the coronavirus (COVID) is available from the World Health Organization (current situation, international travel).Numerous and frequently-updated resource results are available from this ’s WebJunction has pulled together information and resources to assist library staff as they consider how to handle coronavirus.

It has been found that the adsorption capacity of As-V on the porous hematite in aqueous solutions was greatly improved to mg g(-1), compared with mg g(-1) from the original concentrate.

Polymerization of Silicate on Hematite Surfaces and Its Influence on Arsenic Sorption A study of sodium silicate in aqueous solution and sorbed by synthetic magnetite using in situ ATR-FTIR. @article{osti_, title = {Chapter 2 Anion Sorption Topology on Hematite: Comparison of Arsenate and Silicate}, author = {Waychunas, G A and Jun, Y -S and Eng, P J and Ghose, S K and Trainor, T P and UofC) and LBNL)}, abstractNote = {Arsenate and silicate are tetrahedral anions that strongly sorb to positive Fe oxide surfaces over the pH range Adsorption of soluble silicate species (Si(OH) 4) on maghemite (γ-Fe 2 O 3) has been studied by high precision potentiometric titrations, spectroscopic analyses, and zeta potential ions were performed at °C within the range Cited by: @article{osti_, title = {Phosphate adsorption on hematite, kaolinite, and kaolinite-hematite (k-h) systems as described by a constant capacitance model}, author = {Ioannou, A and Dimirkou, A}, abstractNote = {The constant capacitance model was used to describe phosphate adsorption on hematite, kaolinite, and a kaolinite-hematite system (k-h).

The complete results from the adsorption of silicate and arsenite alone and the adsorption of arsenite in the presence of silicate are tabulated in Luxton (). Fig. 1 contains an example of the adsorption results for arsenite and silicate adsorption as a function of time at pH 6 and an initial oxyanion solution concentration of μM.

The data presented in Fig. 1 is representative of the Cited by: The adsorption of organic and inorganic pollutants on mineral surfaces is an important process in environmental chemistry as the adsorption processes influence the transport and activity of contaminants in soils, Adsorption of aqueous silicate on hematite book, and water, and therefore affect the bioavailability, biodegradability, and fate of harmful organic wastes [30,31,32].To understand and influence these processes it is Cited by:   The transformation of ferrihydrite to goethite and/or hematite in alkaline media is strongly retarded by the presence of silicate species.

These species probably stabilize ferrihydrite by adsorbing on the particles of ferrihydrite and linking them into an immobile network.

At concentrations low enough for the transformation to proceed, silicate species promote the formation of hematite and Cited by: 87 with raw material stoichiometry.

Aqueous potassium silicate solution used for organic agriculture is 88 prepared from a product with ratio of potassium carbonate to silicon dioxide. The specific gravity of 89 this product is g/cm3 (20oC). Aqueous potassium silicate is insoluble in alcohol, alkaline (pH ) and Size: KB.

The results showed that adsorption of both natural and composite bentonites strongly depended on the pH Adsorption of aqueous silicate on hematite book of the solution. At lower pH values, the mechanisms that govern the adsorption of bentonites were dissolution of crystal structure and competition between the metal ions and the H +.

To composite bentonite, the lead ion removal Author: Shujing Zhu, Ying Qin. Noncrystalline, high surface area magnesium silicate gel was successfully prepared by hydrothermal method. Such product was characterized by BET and XRD to determine surface area m 2 g −1, average pore width nm, and amorphous surface.

The adsorption behaviors of Basic Brown and Chrysophenine on magnesium silicate gel were investigated through changing initial concentration Cited by: 1. Porous materials were successfully fabricated by silicate tailings in this work, and it could be used as an adsorbent to remove Pb 2+, Cd 2, and Cu 2+ from aqueous solution with high adsorption capacities.

The adsorption performance of SPM was greatly affected by the pH value and the other co-existence of heavy metal ions in the by: 4. Rather, the aqueous solubility of hematite at ambient temperature has been estimated based on the Gibbs free energies of formation (¢G f°) from bulk analyses, and the estimated solubility has been applied to interpret the aqueous systems involving hematite without questioning the consequence of the interfacial hydration of hematite.

The ¢GFile Size: KB. The modified montmorillonite is used to adsorb cesium ions from aqueous solution. The influence factors such as adsorption time, adsorption temperature, adsorption pH, adsorbent dosage and initial concentration was studied in the experiment.

The results show the optimum adsorption time is min, the best adsorption temperature is 50 °C, and pH value is Author: Si Man Liu, Yong Zhou Quan. In this work, oxidized multiwall carbon nanotubes (MWCNTs) were used as a novel adsorbent for removing Ni(II) from aqueous solution. The adsorption of Ni(II) onto oxidized MWCNTs was studied as a function of contact time, pH, ionic strength, MWCNT concentration, and temperature.

The results showed that Ni(II) adsorption onto MWCNTs is strongly dependent on pH and oxidized MWCNT concentration. This investigation explores the ab initio DFT method for understanding surface structure of hematite and the nature and energetics of phosphate adsorption. Using the full potential linearized plane wave method (FP-LAPW), we derived the structure and energies of various magnetic forms of hematite.

The antiferromagnetic (AFM) form was observed to be the most by: 2. The removal of Zn (II) ions from aqueous solution was studied using raw diatomite and MnO2 modified diatomite samples at different adsorption parameters such as contact temperature, contact time, initial metal ions concentration and dosage of diatomite.

The results showed that modified diatomite had a better adsorption than raw diatomite; adsorption increase with increase of time and then Author: Zhong Zheng Yang, Yue Jun Lu, Yang Yang Li. by condensation in aqueous solutions (figure 1).

The distribution of linear, branched, cyclic, and polyhedral anions depends on concentration, temperature, pH, ionic strength, and the nature of cations present.

Silicic acid or silicate anions react with aluminium to form hydroxyaluminosilicate species of similar cage-like structures [28, goldberg: adsorption of arsenate and arsenite on oxides and clay minerals (KGa-2), montmorillonite (SAz-1), and illite (IMt-2) were By convention surface complexation reactions in the constant obtained from the Clay Minerals Society Source Clay Reposi- capacitance model Cited by: The Measurement of Surface Areas of Some Silicates by Solution Adsorption,O.

INEL,F.T_ UMSEK¨ Experimental Materials The silicate samples used as adsorbents were bentonite supplied from the U˘sak region, sepiolite from the Sivrihisar/Eski˘sehir region, zeolitic tu (rich in clinoptilolite mineral) from the Bigadi˘c/Bal kesir region.

Graphene nanosheets (GNSs) that were obtained by vacuum-promoted low-temperature exfoliation were used to adsorb lead ions from an aqueous system. The pristine and thermally modified GNSs were characterized with scanning electron microscopy observation and X-ray photoelectron spectroscopy analysis.

It was interestingly found that the adsorption against lead ions was enhanced by heat Cited by: Which of the following is a silicate mineral?A. hematiteB. p Get solutions. We have solutions for your book. Chapter: Problem: FS show all steps.

Which of the following is a silicate mineral. Which of the following is a silicate mineral. hematite. pyrite. gypsum. Phosphate adsorption on hematite was characterized as a function of pH (–) and phosphate concentration (5– µM) by in situ ATR-FTIR spectroscopy.

Under most conditions a mixture of different (inner-sphere) phosphate complexes existed at the hematite surface, with the relative. Effects of dissolved carbonate on arsenate [As(V)] reactivity and surface speciation at the hematite−water interface were studied as a function of pH and two different partial pressures of carbon dioxide gas [PCO2 = atm and ∼0; CO2-free argon (Ar)] using adsorption kinetics, pseudo-equilibrium adsorption/titration experiments, extended X-ray absorption fine structure spectroscopic.

Non-Silicate Minerals, Earth Materials. STUDY. Flashcards. Learn. Write. Spell. Test. PLAY. Match. Gravity. Created by. chadprice. Mineral List for Geo Terms in this set (39) Graphite - Diamond. Non-Silicate Native Element Cations-Carbon Soft Flakes, writes on paper.

Copper. Non-Silicate Non-Silicate Oxides and Hydroxides hematite. water for adsorption experiments in the absence of CO 2. Pseudo-equilibrium Arsenate Adsorption Experiments.

Arsenate adsorption experiments with hematite [1 g L-1 [As-(V)] 0 ˇ mM and I) M NaCl] were conducted as a function of pH () under ambient air [with the partial pressure of carbon dioxide gas (P CO2)) atm] or CO THERMODYNAMICS OF WATER ADSORPTION 85 quantities was shown by Lewis and Randall () to be as follows: G = nlG1 +n2€2 + (2) and nldG1 +nzd€~ +.= 0 (3) where G is the integral property, such as the free energy, heat, or entropy for the over-all reaction and GI, Q2 are the partial molal quantities for each of the constituents in the reaction.

nl and n2 are the amounts (in moles. The influence of crystallite size on the adsorption reactivity of phosphate on 2-line to 6-line ferrihydrites was investigated by combining adsorption experiments, structure and surface analysis, and spectroscopic analysis.

X-ray diffraction (XRD) and transmission electron microscopy (TEM) showed that the ferrihydrite samples possessed a similar fundamental structure with a crystallite size Cited by: Competitive Adsorption of Phosphate, Molybdate, Borate and Silicate in Binary-anion mixture with soils Adsorption compétitive de phosphate, molybdate, borate, et silicate dans les mélanges binaires d’anions et de sols CHOUDHARY O.P., HUNDAL H.S., KUMAR S.

Department of Soils, Punjab Agricultural university, Ludhiana Introduction. enhanced adsorption of collector mixtures on the hydrophilic mineral surfaces and the increased selectivity between hematite and ferromagnesian silicates.

Application of a mixture of alkyletherdiamine and primary monoamine at ratio with reagent dosage at g/t allowed formation of a stable adsorption layer on the quartz surface and on the File Size: KB.

Fluorescence spectroscopy showed that adsorption of benzo(a)pyrene to iron oxide (hematite), silica & asbestos (anthophyllite & canadian chrysotile) results in a greatly enhanced rate of benzo(a)pyrene uptake into rat liver microsomes when compared to uptake from aqueous dispersions of.

The process of adsorption is considered to be one of the best water treatment technologies around the world. Different heavy metals, due to their toxic and hazardous nature, are possibly the most widespread groundwater contaminants imposing a serious threat to human health.

In this review, an attempt has beeCited by: Adsorption of Ru(phen)32+ ions by sodium montmorillonite and synthetic saponite Figure 2 shows the change of visible spectrum of an aqueous A-Ru(phen)32+ solution in the presence and absence of sodium montmorillonite.

On addition of a clay, the absorption band in the nm. References. Niu, L. Zheng, J. Zhou, Z. Dang, Z. Li, Synthesis of an adsorbent from sugarcane bagasse by graft copolymerization and its utilization to remove Cd(II. T1 - Optimisation of the aqueous precipitation synthesis of silicate-substituted hydroxyapatite.

AU - Hadden, Daniel James. AU - Skakle, Jan. AU - Gibson, Iain Ronald. PY - /3/ Y1 - /3/ N2 - Silicon-substituted hydroxyapatite (SiHA) bioceramics are widely used as bone replacement by: 3.

The Th adsorption is mainly due to the surface complexation of Th4+ or thorium hydroxides. The adsorption characteristics of Eu and Th on illite and montmorillonite is represented by Langmuir adsorption isotherm.

The maximum adsorbed amount of Eu and Th on illite, resulted from adsorption isotherm, is 32 and meq/ g, by: 1.

the Mg silicate smokes anneal into nm sized particles of forsterite, tridymite and periclase at K in up to 30 hours [1,2]. The Fe silicate smoke required higher temperatures (~ K) to anneal in the same time scale as the Mg smoke [1].

Amorphous silicate materials have been reported. CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): Abstract--Methods previously used to distinguish between water adsorbed on external surfaces and in the interlamellar space of Na-montmorillonite during adsorption and desorption of water vapor have been extended to a set of homoionic Li- Na- K- Rb- and Cs-montmorillonite.

silicate derivatives such as zeolite-based catalysts. Today, PQ is the world’s leading manu-facturer of silicates and silicate-derived inorganic chemicals, and the world’s largest volume sion inhibitors, sodium silicates have a beneficial effect on pH.

Added in the proper amount, sodium. Start studying Physical Science Chapter quiz #1. Learn vocabulary, terms, and more with flashcards, games, and other study tools.cases, spherical silicate particles with sizes of between 50 and nm were formed.

It was reported by Godoi et al. that noncrystalline silicate particles can be prepared by mixing an aqueous sodium silicate solution with an alcohol such as ethyl alcohol or 2-propanol They explained that spherical particles.Introduction.

MCM is a hexagonal ordered mesoporous silicate, member of the M41S family. It presents large surface area in the m 2 g-1 range, high pore volume and uniform distribution of pore size ( nm). The long-range space group is P6mm and its porous walls are relatively thin, with a width of nm.

1 All these properties allow the employment of M41S materials in.