Equilibrium, thermodynamics and kinetics studies for the removal of alpha and beta endosulfan by adsorption onto bentonite clay

Ullah, Shafqat; Tahir, S.S.; Kang, Jung-Ho; Chang, Yoon Seok

doi:10.1016/j.cej.2012.03.047

Cited by 36 publications

(18 citation statements)

References 37 publications

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“…The factor of linear correlation was higher for the pseudo-second-order model (0.9966), so that in the adsorption process with eggshell present best fit to this model. The chemisorption in this adsorption system is apparently present [23]. Moreover, the q e value obtained experimentally (17.98 mg•g −1 ) with Langmuir isotherm was closest to that obtained applying the kinetic of pseudo-second-order (19.76 mg•g −1 ).…”

Section: Adsorption Kinetics Of Leaching (Previously Oxidized) Using supporting

confidence: 72%

Adsorption Kinetics of Matter Contained in a Leachate Using Eggshell and Activated Carbon

Zamora-Villafranco¹,

Quintal²,

Gómez-Salazar³

et al. 2014

JEP

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The generation of highly polluting leachate from Sanitary Landfills has prompted the development of technologies applicable to treatment of these liquids. The aim of this study was to determine the kinetics of adsorption of organic and inorganic matter contained in pre-treated leachate (by advanced oxidation by the Fenton reaction); after two adsorbents were used, first eggshell and then activated carbon. To determine the content of organic and inorganic matter COD was measured; this was the parameter for monitoring the kinetics. The leachate was subjected to advanced oxidation treatment by the Fenton reaction, then the adsorption process was conducted by batch, in two consecutive steps, the first step was the use of eggshell and the second step activated carbon. Due to the oxidation treatment the pH value decreased to 2, after the adsorption eggshell the pH increased to 6.9 and this was maintained in the treatment with activated carbon. The kinetics of adsorption of organic and inorganic matter on eggshell was evaluated by models pseudo-first-order and pseudo-second-order, the better fitting was the latter. The adsorption process was adjusted to the model of Langmuir. The negative value of ΔHads indicated that the adsorption process was exothermic, spontaneous and favorable. The separation factor RL of Langmuir Isotherm values indicated that the adsorption of the matter on the eggshell was favorable at different temperatures. Finally, the activated carbon adsorption of liquid obtained from treatment with eggshell was favored with the kinetic model of pseudo second order. With the oxidation process, eggshell adsorption and activated carbon adsorption, the removal COD was 98.6%. The final COD value was fulfilled with the Mexican standard NOM-001-SEMARNAT-1996.

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Section: Adsorption Kinetics Of Leaching (Previously Oxidized) Using supporting

confidence: 72%

Adsorption Kinetics of Matter Contained in a Leachate Using Eggshell and Activated Carbon

Zamora-Villafranco¹,

Quintal²,

Gómez-Salazar³

et al. 2014

JEP

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“…Generally, the adsorption processes include three stages. The first is considered as a diffusion of adsorbate through the solution to the external surface of 6 Journal of Nanomaterials [32]. It is important to note that the correlation coefficients are lower than 0.81 for ACSH at different temperatures, which suggest a nonlinear relationship.…”

Section: Adsorption Kineticsmentioning

confidence: 99%

Synthesis and Characterization of Different Crystalline Calcium Silicate Hydrate: Application for the Removal of Aflatoxin B1 from Aqueous Solution

Zeng

Yang

Wang

et al. 2014

Journal of Nanomaterials

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Different crystalline calcium silicate hydrates (CSH) were synthesized under specific hydrothermal conditions and several methods were used to analyze samples. Amorphous calcium silicate hydrates (ACSH) mainly consists of disordered calcium silicate hydrate gel (C-S-H gel) and crystalline calcium silicate hydrates (CCSH) consists of crystallized tobermorite. The adsorption of carcinogenic aflatoxin B1 (AFB1) onto ACSH and CCSH was investigated. The adsorption kinetics was studied using pseudofirst-order and pseudo-second-order kinetic models and intraparticle diffusion model. The pseudo-second-order model provided the best correlation and the intraparticle diffusion controlled the adsorption process of AFB1 onto CCSH. Adsorption isotherm parameters were obtained from Langmuir and Freundlich and the adsorption data fitted to Freundlich much better. Based on the results of N 2 adsorption/desorption, adsorption kinetics, and adsorption isotherms, the adsorption mechanism of AFB1 onto CCSH was developed. All results indicate that CCSH has a great potential to be a safe, easy-made, and cost-effective material for the control of AFB1 contamination.

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“…For adsorption isotherms, dye solutions of different concentrations were agitated with the known amount of adsorbent until the equilibrium was achieved. Various experimental parameters such as pH (2)(3)(4)(5)(6)(7)(8)(9)(10)(11), temperature (25-45 °C), adsorbent mass (0.1-2 g/L), initial BY28 concentration (25-300 mg/L) and contact time were investigated. The amount of dye removed and the amount of dye adsorbed on per unit of adsorbent (q e ) at the sampling time were calculated using the following equations:…”

Section: Experimental Adsorption Isothermsmentioning

confidence: 99%

“…Textile industries are one of the largest consumers of water and hence producers of liquid effluents. The dyeing and finishing processes generate volumes of wastewaters in the range 45-450 m 3 per ton of product, 1 containing salts, acids, bases, additives and unfixed dyes. A suitable treatment of these complex wastewaters should lead to a strong decline on the organic load, and desirably to a complete elimination of the residual color.…”

Section: Introductionmentioning

confidence: 99%

Adsorptive/desorptive potential of cationic basic yellow 28 (by28) dyes onto natural untreated clay from aqueous phase

Chaari¹

2018

OAJS

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Equilibrium, thermodynamics and kinetics studies for the removal of alpha and beta endosulfan by adsorption onto bentonite clay

Cited by 36 publications

References 37 publications

Adsorption Kinetics of Matter Contained in a Leachate Using Eggshell and Activated Carbon

Adsorption Kinetics of Matter Contained in a Leachate Using Eggshell and Activated Carbon

Synthesis and Characterization of Different Crystalline Calcium Silicate Hydrate: Application for the Removal of Aflatoxin B1 from Aqueous Solution

Adsorptive/desorptive potential of cationic basic yellow 28 (by28) dyes onto natural untreated clay from aqueous phase

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