scholarly journals Characterization of Clays and Clay-organic Complexes

1969 ◽  
Vol 50 (4) ◽  
pp. 303-315
Author(s):  
Raúl Pérez Escolar
Keyword(s):  
Organic Materials ◽  
Adsorbed Water ◽  
Exchange Capacity ◽  
Hydroxyl Groups ◽  
No Adsorption ◽  
X Ray ◽  
Organic Complexes ◽  
Poorly Drained Soils ◽  
Active Residue

Information is presented with reference to the infrared spectroscopy of blackstrap molasses, rum distillery slops, the active fraction of the slops, clays of four poorly drained soils, and of the complexes formed between organic materials and the clays of Fe, Guanica, Whippany, and Evesboro soils. The X-ray spectroscopy of two of the clays of montmorillonitic nature and of the complexes formed with the organic materials is also shown. Characteristic peaks of the organic materials include those caused by hydroxyl, methyl, amino, methoxy, carbonyl, and ketonic groups. The spectra of the clays showed peaks which are attributed to hydroxyl, bonded and unbonded, adsorbed water, silica tetrahedra, and aluminum octahedra. Hydrogen-bonding occurred between the exposed hydroxyl groups of the clay crystals and the molasses, slops, and its active residue. There was no shift in the 2 angle of diffraction of the expanding-laitice clays, indicating that there was no adsorption in the interlamellar spaces. The adsorption was possible at the edges of the crystal. This finding was strengthened by the fact that rather than undergoing a decrease in cation-exchange capacity there was a slight increase in the expending lattice clays.

scholarly journals Characterization of conichalcite by SEM, FTIR, Raman and electronic reflectance spectroscopy

2005 ◽  
Vol 69 (2) ◽  
pp. 155-167 ◽  
Author(s):  
B. J. Reddy ◽  
R. L. Frost ◽  
W. N. Martens
Keyword(s):  
Near Infrared ◽  
Adsorbed Water ◽  
Reflectance Spectroscopy ◽  
Sem Images ◽  
X Ray ◽  
Near Ir ◽  
Ir Reflectance ◽  
Yavapai County ◽  
Ir Bands

AbstractThe mineral conichalcite from the western part of Bagdad mine, Bagdad, Eureka District, Yavapai County, Arizona, USA has been characterized by electronic, near-infrared (NIR), Raman and infrared (IR) spectroscopy. Scanning electron microscopy (SEM) images show that the mineral consists of bundles of fibres. Calculations based on the results of the energy dispersive X-ray analyses on a stoichiometric basis show the substitution of arsenate by 12 wt.% of phosphate in the mineral. Raman and IR bands are assigned in terms of the fundamental modes of AsO43− and PO43− molecules and are related to the mineral structure. Near-IR reflectance spectroscopy shows the presence of adsorbed water and hydroxyl units in the mineral. The Cu(II) coordination polyhedron in conichalcite can have at best pseudo-tetragonal geometry. The crystal field and tetragonal field parameters of the Cu(II) complex were calculated and found to agree well with the values reported for known tetragonal distortion octahedral complexes.

SEM, XRF, XRD, Nitrogen Adsorption, Fosters Swelling and Capacity Adsorption Characterization of Cloisite 30 B

2012 ◽  
Vol 727-728 ◽  
pp. 1591-1595 ◽  
Author(s):  
Aline Cadigena Lima Patrício ◽  
Marcílio Máximo da Silva ◽  
Anna Karoline Freires de Sousa ◽  
Mariaugusta Ferreira Mota ◽  
Meiry Glaúcia Freire Rodrigues
Keyword(s):  
Quaternary Ammonium ◽  
Cation Exchange Capacity ◽  
Nitrogen Adsorption ◽  
Exchange Capacity ◽  
X Ray Diffraction ◽  
Oil And Grease ◽  
X Ray ◽  
Quaternary Ammonium Cations ◽  
Cloisite 30B

Cationic surfactants, such as quaternary ammonium cations, have been used, in order to ameliorate the oil sorption capacity of inorganics materials, such as clays. Clays modified with quaternary ammonium cations (organoclays) have better performance in sorption, remove oil and grease from water at seven times the rate of activated carbon, as well as they can be used like perforation fluids of oil wells to the oil base, lubricants, among others industries. This work aims characterize the Cloisite 30B using various techniques: X-Ray Diffraction (XRD), Specific Surface Area (BET) and Cation Exchange Capacity. Different organic solvents, namely gasoline, diesel and kerosene were used in order to investigate the clays compatibility after orgophilization.

Study of the Characterization of Smectitic Clays from a Town in the State of Paraíba

2015 ◽  
Vol 820 ◽  
pp. 51-55
Author(s):  
I.A. Silva ◽  
I.D.S. Pereira ◽  
W.S. Cavalcanti ◽  
F.K.A. Sousa ◽  
Gelmires Araújo Neves ◽  
...  
Keyword(s):  
Specific Area ◽  
Mineralogical Composition ◽  
Exchange Capacity ◽  
The State ◽  
Chemical Behavior ◽  
X Ray Diffraction ◽  
X Ray ◽  
Technological Improvements ◽  
The Town

The State of Paraíba has gained prominence in the production of raw bentonite in Brazil, where a new deposit has been found in the town of Sossego-PB, besides the deposit in the town of Boa Vista-PB. With the raise in the demand, the traditional reserves are depleting after several years of exploration, and this fact may result in a higher dependence on imported clays, thus existing a great interest in the discovery and characterization of new deposits, also guaranteeing technological improvements for the region. So, the objective of this work is to characterize the new deposits of the State of Paraíba, aiming at analyzing the characteristics the prove their classification as smectitic clays. The characterization was made through the analysis of chemical composition by X-ray fluorescence (EDX), X-ray diffraction (XRD), thermogravimetric analysis and thermal differential analyses (TG and DTA), cation-exchange capacity (CEC) and specific area (SA). The results prove that the studied samples presented, in their mineralogical composition, smectite, kaolinite and quartz, besides thermal and chemical behavior typical smectitic clays.

Physico-Mineralogical Characterization: Bentonitic Clays Recently Found in Olivedos, Paraíba, Brazil

2015 ◽  
Vol 820 ◽  
pp. 56-59
Author(s):  
F.K.A. Sousa ◽  
I.A. Silva ◽  
W.S. Cavalcanti ◽  
Gelmires Araújo Neves ◽  
Heber Carlos Ferreira
Keyword(s):  
Cation Exchange Capacity ◽  
Petroleum Industry ◽  
Specific Area ◽  
Exchange Capacity ◽  
X Ray Diffraction ◽  
Mineralogical Characterization ◽  
X Ray ◽  
Petroleum Wells ◽  
The Town

Used in various branches of the industry, bentonitic clays are considered a valuable mineral, used specially in the petroleum industry for manufacturing of fluids used the drilling of petroleum wells in long depth. Recently, a deposit of this valuable mineral was discovered in the town of Olivedos-PB. There are data that prove that this is a very poor and underdeveloped town. So, this work aims at the physico-mineralogical characterization of clays recently discovered and, this way, verify if they present similar characteristics which allow them to replace the clays from Boa Vista-PB, and if they can be used by the industry, thus bringing social development for that town. The characterization was made by means of the analysis of chemical composition by X-ray fluorescence (EDX), thermogravimetric and thermal differential analyses (TG and DTA), X-ray diffraction (XRD), cation-exchange capacity (CEC) and specific area (SA). The results show that the clays recently discovered in Olivedos-PB are polycationic clays, presenting MgO, CaO and K2O content, and that they are constituted by smectitic clay mineral, by quartz and kaolinite.

scholarly journals Characterization of Philippine natural bentonite

2021 ◽  
Vol 2 ◽  
Author(s):  
Eleanor M. Olegario ◽  
Mon Bryan Z. Gili
Keyword(s):  
Cation Exchange Capacity ◽  
Ammonium Acetate ◽  
Exchange Capacity ◽  
Ftir Analysis ◽  
Chemical Analyses ◽  
Barium Acetate ◽  
Scanning Calorimetry ◽  
X Ray ◽  
The Common

Abstract Philippine natural bentonite is characterized using X-ray diffractometer (XRD), scanning electron microscope (SEM), chemical analysis, thermogravimetric-differential scanning calorimetry (TG-DSC), and Fourier transform infrared (FTIR) analysis. The cation exchange capacity (CEC) was also measured. XRD shows that the mineral is composed primarily of mordenite, hectorite, and montmorillonite. SEM shows the flaky and porous structure of the bentonite powder. Chemical analyses show that SiO2 (47.90 wt%) and Al2O3 (14.02 wt%) are the major components of the clay. TG-DSC shows that the mineral contains 15.55% moisture. IR transmittance spectrum shows the common vibration bands present in the sample which include O–H stretching of inter-porous water, symmetric and asymmetric stretching of hydroxyl functional groups, asymmetrical stretching of internal tetrahedra (O–Si–O and O–Al–O), symmetrical stretching of external linkages, and so on. The measured CEC were found to be 91.37 and 43.01 meq/100 g according to the ammonium acetate method and barium acetate method, respectively.

Synthesis and Characterization of Zn Nanoparticles by Using Hetero-Bicyclic Compound

2014 ◽  
Vol 938 ◽  
pp. 3-8
Author(s):  
V. Pushpanathan ◽  
D. Suresh Kumar
Keyword(s):  
Condensation Reaction ◽  
Energy Dispersive Spectrum ◽  
Hydroxyl Groups ◽  
Bicyclic Compound ◽  
X Ray Diffraction ◽  
X Ray ◽  
Free Hydroxyl ◽  
Ft Ir ◽  
Esi Mass Spectrometry

The 1:1 condensation reaction between benzil and tris (hydroxymethyl) aminomethane in methanol yields a hetero bicyclic compound 5-(hydroxymethyl)-1,2-diphenyl-3,7-dioxa-8-aza-bicyclo [3.2.octan-2-ol. It was characterized by FT-IR, NMR (1H and 13C) spectroscopy and ESI mass spectrometry. The structure was conclusively determined by X-ray diffractrometric analysis. The structure shows a hetero bicyclic ring system. It consists of six membered morpholine and five membered oxazolidine rings with free hydroxyl groups. This bicyclic compound was used as a reducing and stabilizing agent to prepare zinc nanoparticles. The morphology and structure were characterized by field emission scanning electron microscope (FE-SEM), powder X-ray diffraction (XRD), and energy dispersive spectrum analysis (EDS).

Synthesis and characterization of a silylated Brazilian clay mineral surface

2014 ◽  
Vol 68 (7) ◽  
Author(s):  
Márcia Silva ◽  
Saloana Gomes ◽  
Maria Fonseca ◽  
Kaline Sousa ◽  
José Espínola ◽  
...  
Keyword(s):  
Clay Mineral ◽  
Solid State Nmr ◽  
Textural Properties ◽  
Hydroxyl Groups ◽  
X Ray Diffraction ◽  
Sem Images ◽  
X Ray ◽  
Diffraction Patterns ◽  
Trimethoxy Silane

AbstractClay mineral containing kaolinite, illite and montmorillonite was organofunctionalized with silylating agents: (3-aminopropyl)triethoxysilane, 3-[2-(2-aminoethylamino)ethylamino]propyl-trimethoxysilane and (3-mercaptopropyl)trimethoxy-silane, to yield three hybrids labelled Clay1, Clay2 and Clay3, respectively. These solids were characterized using elemental analysis, thermogravimetry, X-ray diffractometry, infrared spectroscopy, scanning electron micrograph, and 29Si and 27Al solid state NMR. Immobilized quantities of the organic groups were 0.66 mmol g−1, 0.48 mmol g−1 and 0.88 mmol g−1 for Clayx (x = 1–3), respectively. X-ray diffraction patterns confirmed the immobilization of silanes onto the surface without changes in the textural properties of the clay mineral as noted from the SEM images. Spectroscopic measurements were in agreement with the covalent bonding between the silanes and the hydroxyl groups deposited on the surface. The new hybrids were utilized as adsorbents of cobalt in aqueous solution, with retention values of 0.78 mmol g−1, 1.1 mmol g−1 and 0.70 mmol g−1 for Clayx (x = 1–3), respectively.

Preparation and Characterization of Citric Acid Modified Marigold Dregs Biosorbents

2011 ◽  
Vol 236-238 ◽  
pp. 895-898
Author(s):  
Yi Wang ◽  
Ting Zhang ◽  
Kun Jie Wang ◽  
De Yi Zhang
Keyword(s):  
Citric Acid ◽  
Photoelectron Spectroscopy ◽  
Low Cost ◽  
Infrared Emission ◽  
Hydroxyl Groups ◽  
High Adsorption ◽  
Adsorption Ability ◽  
X Ray ◽  
Adsorption Quantity

The objectives of this study were to convert marigold dregs to a cationic metal ions and dye adsorbent and further to investigate the potential of using the adsorbent for the removal of copper(Ⅱ) and methylene blue (MB) from effluents. The base washed marigold dregs and citric acid (CA) modified marigold dregs (MMD) were prepared and the structure were investigated by fourier transform infrared, emission scanning electron microscope and X-ray photoelectron spectroscopy. The results show that the modification did not significantly change the morphology of the dregs surface structure but the esterificated reaction could increase the carboxyl groups and hydroxyl groups on the surface of the adsorbent. The adsorption ability are also evaluated by MB and copper(Ⅱ) and the results show the MMD is an excellent adsorbent. Due to the high adsorption quantity, it may be used as a low cost alternate adsorbent for the elimination of metal and dye ions form effluents.

scholarly journals Physicochemical Characterization of Cherry Pits-Derived Biochar

Materials ◽  
2022 ◽  
Vol 15 (2) ◽  
pp. 408
Author(s):  
Vladimír Frišták ◽  
Diana Bošanská ◽  
Martin Pipíška ◽  
Libor Ďuriška ◽  
Stephen M. Bell ◽  
...  
Keyword(s):  
Functional Groups ◽  
Material Characterization ◽  
Physicochemical Characterization ◽  
Exchange Capacity ◽  
Surface Functional Groups ◽  
X Ray ◽  
Surface Functionality ◽  
Boehm Titration ◽  
Pyrolysis Processes

Although the suitability of some biochars for contaminants’ sorption separation has been established, not all potential feedstocks have been explored and characterized. Here, we physicochemically characterized cherry pit biochar (CPB) pyrolyzed from cherry pit biomass (CP) at 500 °C, and we assessed their As and Hg sorption efficiencies in aqueous solutions in comparison to activated carbon (AC). The basic physicochemical and material characterization of the studied adsorbents was carried out using pH, electrical conductivity (EC), cation exchange capacity (CEC), concentration of surface functional groups (Boehm titration), and surface area (SA) analysis; elemental C, H, N analysis; and Fourier-transform infrared spectroscopy (FTIR) and scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM–EDX). AsO43− anions and Hg2+ cations were selected as model contaminants used to test the sorption properties of the sorption materials. Characterization analyses confirmed a ninefold increase in SA in the case of CPB. The total C concentration increased by 26%, while decreases in the total H and N concentrations were observed. The values of carbonate and ash contents decreased by about half due to pyrolysis processes. The concentrations of surface functional groups of the analyzed biochar obtained by Boehm titration confirmed a decrease in carboxyl and lactone groups, while an increase in phenolic functional groups was observed. Changes in the morphology and surface functionality of the pyrolyzed material were confirmed by SEM–EDX and FTIR analyses. In sorption experiments, we found that the CPB showed better results in the sorption separation of Hg2+ than in the sorption separation of AsO43−. The sorption efficiency for the model cation increased in the order CP < CPB < AC and, for the model anion, it increased in the order CPB < CP < AC.

Synthesis and characterization of a new crystalline tin(IV) arsenophosphate ion exchanger

1990 ◽  
Vol 68 (2) ◽  
pp. 346-349 ◽  
Author(s):  
K. V. Surendra Nath ◽  
S. N. Tandon
Keyword(s):  
Ion Exchange ◽  
Cation Exchanger ◽  
Exchange Capacity ◽  
Ion Exchanger ◽  
Amorphous Precursor ◽  
X Ray ◽  
Inorganic Ion Exchanger ◽  
Inorganic Ion ◽  
Exchange Behaviour

A new crystalline layered inorganic ion exchanger tin(IV) arsenophosphate with the formula Sn(HAsO4)(HPO4)•H2O has been prepared by refluxing the amorphous precursor. This exchanger has been characterized by X-ray powder pattern, chemical analysis, IR spectra, and thermal dehydration. Its ion exchange behaviour towards sodium ions is reported. The exchanger has an exchange capacity of 5.36 mequiv./g for Na+. The performance of tin(IV) arsenophosphate is compared with crystalline tin(IV) phosphate and arsenate. Keywords: cation exchanger, crystalline tin(IV) arsenophosphate, ion exchange, thermal behaviour, X-ray studies.

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