Characterization of Unye bentonite after treatment with sulfuric acid

Çağlar, Bülent; Afsin, B.; Koksal, E.; Tabak, Ahmet Fatih; Eren, Erdal

doi:10.1590/s0100-40422013000700006

Cited by 35 publications

(19 citation statements)

References 28 publications

(50 reference statements)

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“…The specific surface area greatly increases at the acid concentration of 1N, but slightly decreases at the concentrations higher than this value and then does not change much. Similar result were found by activating bentonite with sulphuric acid, where the surface area decreases were observed by treating clay up to 3M H 2 SO 4 [40] and 6M H 2 SO 4 [13], respectively. The XRD patterns of raw and activated bentonites at various concentrations (0.1, 1 and 6 N) were shown in Fig.…”

Section: Characterization Of the Adsorbentsupporting

confidence: 84%

“…This consists of the treatment of clay with a mineral acid solution, usually hydrochloric or sulphuric acids. The main goal of this process is to obtain partly dissolved material of high specific surface area, porosity and surface acidity [12,13]. Bentonite consists predominately of montmorillonite, a 2:1 clay mineral containing an octahedral sheet between two tetrahedral sheets.…”

Section: Introductionmentioning

confidence: 99%

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Removal of Chlorothalonil from water by a bentonite treated chemically

Boudouara¹,

Marouf²,

Ouadjenia³

et al. 2017

JMES

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The adsorption of Chlorothalonil fungicide from aqueous solution onto raw and activated bentonite samples was investigated as a function of parameters such as pH, contact time, and temperature. The acid activation of natural bentonite was performed by treatment with hydrochloric solution of different concentrations. The high adsorption capacity of chlorothalonil was obtained by activated bentonite at 323 K in the range of pH 3-4 for 60 min of contact time. It was be 32.01 and 42.88 mg/g for raw and bentonite activated by 1N hydrochloric acid, respectively. The Langmuir and Freundlich adsorption models were applied to describe the related isotherms. Freundlich equation has shown the best fitting with the experimental data. The pseudo-first order and pseudo-second order kinetic models were used to describe the kinetic data. The changes of enthalpy, entropy and Gibbs free energy of adsorption process were determined. The results indicated that the adsorption of chlorothalonil occurs spontaneously as an endothermic process.

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Section: Characterization Of the Adsorbentsupporting

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Removal of Chlorothalonil from water by a bentonite treated chemically

Boudouara¹,

Marouf²,

Ouadjenia³

et al. 2017

JMES

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“…The decrease of the pore size was attributed to the occupation of the pore spaces by the solute species in the POME (Peter et al, 2010). Therefore, altering the chemistry, and in particular the pore structure, could lead to significant changes in the surface area, porosity and reactivity of the end product and directly influence the adsorptive properties of AC (Mangun, 2001;Caglar et al, 2013).…”

Section: Textural Characterization Of Psk-acmentioning

confidence: 99%

Efficiency of activated carbon from palm kernel shell for treatment of greywater

Razi

Al-Gheethi

Al-Qaini

et al. 2018

Arab Journal of Basic and Applied Sciences

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The potential of activated carbon from palm kernel shell (PKS-AC) to improve the quality of surface water and greywater based on the measurements of the parameters pH, turbidity, chemical oxygen demand (COD), total dissolved oxygen (TDS) and total suspended solids (TSS) was investigated in the present study. The PKS was acid treated with aqueous H 3 PO 4 (1 N) for overnight at room temperature and then subjected to heat treatment at 550 C for 2 h. The efficiency of the PSK-AC samples of 30 and 40 mm thicknesses was examined for reduction of the above parameters in surface water and greywater samples for 5, 15, 30 and 60 min of the filtration process. The efficiency of COD reduction by 50 and 56.44%, that of TDS by 57.81% and 22%, and that of TSS by 83.11 and 42.11% were detected using the PSK-AC samples above, respectively. The OH group contributed most to the removal of pollutants among the OH, N-H, C¼O, C¼C, C-O-C, C-O-H main functional groups pointed out via Fourier Transform Infra-red (FTIR) analysis on the surface. The scanning electron microscopy (SEM) images revealed that the surface of the raw PSK-AC appeared smooth with holes on the external surface, while the grains were filled in the PSK-AC after the adsorption process. ARTICLE HISTORY

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“…Bands at 795 and 520 cm -1 corresponded to the bending of Si-O (quartz) bonds and Si-O-Al bonds, respectively [35,37]. It was also possible to observe the Al-OH group at 915 cm -1 [38,39]. Fig.…”

Section: Resultsmentioning

confidence: 98%

Effect of thermal treatment on the catalytic activity of a Fe-rich bentonite for the photo-Fenton reaction

et al. 2019

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The objective of this work was to evaluate the degradation of rhodamine B dye from aqueous solution by photo-Fenton reaction under visible irradiation using a Fe-rich bentonite as a catalyst. The material was thermally treated at a low temperature (200 °C) and characterized by XRD, N 2 adsorption-desorption isotherms, FTIR, SEM-EDS and XRF. Iron leaching in aqueous solution after the photo-Fenton reaction was evaluated by atomic absorption spectroscopy. The material exhibited a mesoporous structure, containing a specific surface area of 99 m 2 .g -1 . The catalytic results showed significant dye degradation, reaching 95% of decolorization and 72% of mineralization at 300 min of reaction. The catalyst showed high chemical stability in four reaction cycles. Therefore, this thermally treated Fe-rich bentonite can be considered as a promising catalyst in the heterogeneous photo-Fenton reaction for the degradation of rhodamine B from aqueous solution. ResumoO objetivo deste trabalho foi avaliar a degradação do corante rodamina B em solução aquosa por reação foto-Fenton sob irradiação visível utilizando uma bentonita rica em ferro como catalisador. O material foi tratado termicamente a baixa temperatura (200 ºC) e caracterizado por DRX, isotermas de adsorção-dessorção de N 2 , FTIR, MEV-EDS e FRX. A lixiviação do ferro na solução aquosa após a reação foto-Fenton foi avaliada por espectroscopia de absorção atômica. O material exibiu uma estrutura mesoporosa, apresentando uma área de superfície específica de 99 m 2 .g -1 . Os resultados catalíticos mostraram alta eficiência na degradação do corante, atingindo 95% de descoloração e 72% de mineralização em 300 min de reação. O catalisador apresentou alta estabilidade química em quatro ciclos de reação. Portanto, esta bentonita rica em Fe tratada termicamente pode ser considerada como um promissor catalisador na reação foto-Fenton heterogênea para a degradação da rodamina B em solução aquosa.

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Characterization of Unye bentonite after treatment with sulfuric acid

Cited by 35 publications

References 28 publications

Removal of Chlorothalonil from water by a bentonite treated chemically

Removal of Chlorothalonil from water by a bentonite treated chemically

Efficiency of activated carbon from palm kernel shell for treatment of greywater

Effect of thermal treatment on the catalytic activity of a Fe-rich bentonite for the photo-Fenton reaction

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