Physical and catalytic characterization of smectites from Boa-Vista, Paraíba, Brazil

Rodrigues, Meiry Gláucia Freire

doi:10.1590/s0366-69132003000300007

Cited by 74 publications

(58 citation statements)

References 15 publications

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“…The surface area of untreated BSN-03 clay is 120m 2 /g. This value is higher than the one obtained by Rodrigues (2003) for the Red Clay, 103m 2 /g. These values indicate that untreated BSN-03 clay has a better adsorption capacity than Red Clay.…”

Section: Resultscontrasting

confidence: 67%

Performance of Natural Sodium Clay Treated With Ammonium Salt in the Separation of Emulsified Oil in Water

Oliveira¹,

Mota²,

Silva³

et al. 2012

BJPG

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This study aims to characterize and evaluate the use of adsorbent (organoclay) in the process of separation of oil in water emulsion. One goal of this work is to prepare and characterize untreated sodium clay (BSN-03) from Argentina and treated BSN-03. The method used to prepare the organoclay replaces the cations (Na+) interlayer of the clay by a quaternary ammonia cation. Tests used X-ray diffraction to observe the obtaining of organoclays. The spectrum showed that the distance of the basal clay BSN-03 was modified, indicating that the quaternary ammonium salt was intercalated. Infrared data show that the ammonium salt was incorporated into the clay structure, thereby confirming organophilization. After the preparation and characterization of the organoclay, oil removal capacity (qeq) and the percentage of oil removal (%Rem) of the adsorbent (BSN-03) was observed through a finite bath system. Finite bath tests determined the rate and capacity of oil removal by the treated clay. Up to 49.50 mg/g of oil removal capacity (98.99 % efficiency) was reached, indicating that the clay treated with CTAC is an excellent alternative in the process of oil removal.

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Section: Resultscontrasting

confidence: 67%

Performance of Natural Sodium Clay Treated With Ammonium Salt in the Separation of Emulsified Oil in Water

Oliveira¹,

Mota²,

Silva³

et al. 2012

BJPG

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“…The peaks at 12.12 ∘ and 20.72 ∘ represent the Si-O-Si crystalline layers of the clay [26]. The presence of quartz impurities was also detected at 25.52 ∘ which was confirmed from the results obtained in the literature [27]. After treatment with HCl, the peak intensity of quartz and other minerals in the raw clay was significantly decreased due to the structural disorder that occurred owing to the acid treatment.…”

Section: Purification Of Bijoypur Claysupporting

confidence: 80%

“…K, Ti, Ca, and F were found as free oxide form (i.e., K 2 O, TiO 2 , CaO, and Fe 2 O 3 ); however Si and Al shaped the major phase of kaolinite as SiO 2 and Al 2 O 3 , respectively. The acid treatment induced a significant decrease of Fe 2 O 3 content in purified clay [27]. The further significant decrease of iron content in modified clay resulted due to the presence of strong acid in the modification process.…”

Section: Xrf Analysis Of Raw Clay Purified Clay and Modified Clay (mentioning

confidence: 94%

Facile Preparation of Biocomposite from Prawn Shell Derived Chitosan and Kaolinite-Rich Locally Available Clay

Biswas

Rashid

Mallik

et al. 2017

International Journal of Polymer Science

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A novel composite material was prepared from prawn shell derived chitosan (CHT) and locally available kaolinite-rich modified Bijoypur clay (MC) using a facile technique in which dilute acetic acid was used as a solvent for dissolving chitosan and composite fabrication whereas distilled water was used for preparing the clay dispersion. Bijoypur clay mainly consists of kaolinite clay mineral and it was modified with the dodecyl amine to make it organophilic. Morphology and properties of the composites (different weight ratio of MC and CHT) have been studied and compared with those of pure CHT and MC. Purification and modification of Bijoypur clay were investigated by X-ray diffraction (XRD), X-ray fluorescence (XRF), and Fourier transformed infrared spectroscopy (FTIR) analyses. The fabrication of CHT-MC composites was confirmed by FTIR analysis. Thermogravimetric analysis (TGA) and differential scanning colorimetry (DSC) were used to investigate the thermal stability of the composites. It was observed that dispersed clay improves the thermal stability and enhances the hardness of the matrix systematically with the increase of clay loading. In this study, a better insolubility in both acidic and alkaline media of the composites is also observed compared to pure chitosan.

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“…The CECs differ from one another by an appreciable amount, and the difference is quite significant when compared to the CEC of the calcined MCM-41. The ion exchange capacity is attributed to structural defects, broken bonds and structural hydroxyl transfers [17] and all these factors have been enhanced by the introduction of Fe(III), Co(II) and Ni(II) into MCM-41 by as much as 24.4, 18.0 and 26.8%, respectively, the order being Ni(II) A Fe(III) A Co(II). This is different from the order of Ni(II) A Co(II) A Fe(III) in which the metal ions have entered into MCM-41.…”

Section: Oxidation Reactionmentioning

confidence: 99%

Catalytic Destruction of 4‐Chlorophenol in Water

Chaliha

Bhattacharyya²,

Paul

2008

CLEAN Soil Air Water

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4-Chlorophenol (4-CP) is a toxic, hazardous and persistent pollutant entering water mainly via the effluents of chemical industries. Catalytic wet oxidation has been the favored green chemistry path to convert this chlorinated organic to benign products. Wet oxidation was attempted in this work with MCM-41 based catalysts impregnated with Fe(III), Co(II), and Ni(II). The catalysts were characterized with X-ray diffraction, scanning electron microscopy, FTIR, cation exchange capacity, and atomic adsorption spectrophotometric measurements. 4-CP oxidation was carried out in water, with and without hydrogen peroxide. The efficiency of the catalysts was tested with respect to reaction time, pH, mole ratio of the reactant and the oxidant, catalyst load, feed concentration, and temperature. The typical reaction conditions of temperature of 353 K, time 300 min, catalyst load 2 g/L, 4-CP concentration 10 -3 M could achieve 50.2, 55.0 and 58.2% oxidation in the presence of H 2 O 2 and 48.5, 58.6 and 60.2% oxidation in the absence of H 2 O 2 with Fe(III)-, Co(II)-, and Ni(II)-MCM-41, respectively. The reactions followed pseudo-first-order kinetics with respect to 4-CP and the kinetic constant was between 1.4 N 10 -3 and 3.5 N 10 -3 Lg -1 min -1 . A mechanism for the oxidation of 4-CP is suggested on the basis of product analysis.

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Physical and catalytic characterization of smectites from Boa-Vista, Paraíba, Brazil

Cited by 74 publications

References 15 publications

Performance of Natural Sodium Clay Treated With Ammonium Salt in the Separation of Emulsified Oil in Water

Performance of Natural Sodium Clay Treated With Ammonium Salt in the Separation of Emulsified Oil in Water

Facile Preparation of Biocomposite from Prawn Shell Derived Chitosan and Kaolinite-Rich Locally Available Clay

Catalytic Destruction of 4‐Chlorophenol in Water

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