The adsorption of cationic dye from aqueous solution onto acid-activated andesite

Tsai, Wen‐Tien; Hsu, Hsin-Chieh; Su, Ta‐Wei; Lin, Keng-Yu; Lin, Chien‐Ming; Dai, Tzong-Hung

doi:10.1016/j.jhazmat.2007.01.141

Cited by 130 publications

(77 citation statements)

References 24 publications

(38 reference statements)

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“…The amounts of silica and alumina were increased upon heat treating a kaolinite sample at 600 °C, which could be explained by the dehydration of kaolinite and its conversion into an amorphous phase [21]. The acid activation with concentrated H 2 SO 4 affected the interlayer cations like K + and Ca 2+ and progressively reduced the amounts of Al, Fe and Mg cations [22].…”

Section: Resultsmentioning

confidence: 99%

Effects of Heating and Acid Activation on the Structure and Surface Properties of a Kaolinite-illite-smectite Clayey Mixture

Landoulsi¹

2013

TOMPJ

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Abstract:This work aims at studying the effects of heat treatment and acid activation on the surface properties of a mixture of kaolinite-illite-smectite clay minerals collected from North Est of Tunisia. The raw material was characterized by various analytical and spectroscopic techniques such as XRD, FT-IR, TG-DSC, and N 2 physical adsorption.The true density of starting raw material increased from 2580 to 2609 kg.m 3 , while the surface area, S BET , decreased from 70.7 to 35.3 m 2 .g -1 upon heat treating at 550°C for 1 h. Acid activation of heat treated material led to partial dissolution of the octahedral sheets by interlayer and edge attack, the formation of amorphous silica and an overall structural degradation. Dynamic vapour Sorption (DVS) measurement revealed that the surface energy of the system increased after acid activation and with the acid treatment time. These structural/surface changes translated in higher negative zeta potential (

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Section: Resultsmentioning

confidence: 99%

Effects of Heating and Acid Activation on the Structure and Surface Properties of a Kaolinite-illite-smectite Clayey Mixture

Landoulsi¹

2013

TOMPJ

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“…The PZC of the samples (the molecular sieves), used for the adsorption experiment, was determined by the so called pH drift process [10]. The pH of a deoxygenated dispersion (N 2 bubbling for 1 h) of the adsorbent (0.15 mg) in an aqueous solution of NaCl (50 ml at 0.01 mol l −1 ) was adjusted successively.…”

Section: Methodsmentioning

confidence: 99%

Characterization and Valorization of Industrial Wastes (Molecular Sieves) in the Gas Complex of GP1/Z by BET and Surface Charge Method

Belarbi

Hadjel

2017

Acta Phys. Pol. A

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Industrial waste generates a supplementary cost for companies which must, by the force of law, take in charge their wastes, whether by their own means or through outside services. Molecular sieves used in the sections of dehydratation of natural gas become waste as soon as they are saturated and there is no possibility of regeneration. As a matter of fact, those of type 4Å are used in GP1/Z complex in Algerian company Sonatrach. Within the scope of this work the proposition to valorize these industrial wastes is put forward in the light of a series of analyses and experiments with distilled and polluted water. In this work a path is opened for further research valorization of the type 4Å saturated molecular sieves, used in the gas industry. After a simple wash with distilled water, we have noticed with the naked eye that our sample had changed color from black to white gray. We have repeated the same physical magnetism test, which was positive. We have carried a heat treatment at 100• C to remove physiosorbed water and 350• C heat treatment to remove the pore water. The surface area and pH of point of zero charge (pHPZC) of used zeolite were calculated as 37.54 m 2 g −1 and 6, respectively. The surface area and the pH of point of zero charge(pH PZC) of unused zeolite were calculated as 6.965 m 2 g −1 and 7, respectively.

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“…Since hydrogen ions affect the surface charge of the adsorbents and the adsorbate species [19][20][21], the sorption is greatly affected by the variation of solution pH. In order to investigate the effect of pH on adsorption of Carbaryl onto clay, experiments were performed with 10 mg/l initial concentration between pH 3 and 9 at 20˚C and R = 1 g/1 of clay.…”

Section: Effect Of Solution Ph On Carbaryl Adsorptionmentioning

confidence: 99%

Removal of Carbaryl Pesticide from Aqueous Solution by Adsorption on Local Clay in Agadir

Ouardi¹,

Alahiane²,

Qourzal³

et al. 2013

AJAC

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This study was conducted to assess the removal efficiency of pesticide (Carbaryl) used in Souss Massa region (Agadir city), on a clay originated from barrage situated in Agadir. The adsorption of Carbaryl from aqueous solution by local clay as a low-cost, natural and eco-friendly adsorbent was investigated. Different physicochemical parameters were analyzed: adsorbent mass, ionic strength (NaNO 3 ), initial concentration of pollutant, temperature, and pH. The empirical results showed that all these parameters have an impact on the retention of pesticide on the clay. The equilibrium uptake was increased with an increase in the initial pesticide concentration in solution. The results of adsorption were fitted to the Langmuir and Freundlich isotherms. The Freundlich model represented the adsorption process better than Langmuir model, with correlation coefficients (R 2 ) values ranged from 0.97 to 0.99. This study has shown that the natural clay is a solid that has got an important adsorption capacity, which may be used in treatment and depollution of water.

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The adsorption of cationic dye from aqueous solution onto acid-activated andesite

Cited by 130 publications

References 24 publications

Effects of Heating and Acid Activation on the Structure and Surface Properties of a Kaolinite-illite-smectite Clayey Mixture

Effects of Heating and Acid Activation on the Structure and Surface Properties of a Kaolinite-illite-smectite Clayey Mixture

Characterization and Valorization of Industrial Wastes (Molecular Sieves) in the Gas Complex of GP1/Z by BET and Surface Charge Method

Removal of Carbaryl Pesticide from Aqueous Solution by Adsorption on Local Clay in Agadir

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