Thermodynamics, Kinetics and Equilibrium Adsorption of CR (VI) and HG (II) in Aqueous Solution on Corn Husk (Zea Mays)

doi:10.20902/ijctr.2018.110529

Cited by 3 publications

(3 citation statements)

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“…As was reported previously, Cr(VI) adsorption by using coconut shells is endothermic, spontaneous, and irreversible (Ijeamaka, Christian, Fabian, MaryJane, and Joseph, 2018) and tamarind shells behave similarly (Bangaraiah, 2020). By contrast, adsorption by means of corn residues is reversible, favourable, spontaneous, and endothermic (Núñez-Zarur, Tejada-Tovar, Villabona-Ortíz, Acevedo, and Tejada-Tovar, 2018). Thus, the objective of the present work is to determine the influence of temperature on the adsorption of Cr(VI) present in aqueous solutions, using waste materials from the agro-industry such as palm bagasse and plantain peels.…”

Section: Introductionmentioning

confidence: 68%

Adsorption Thermodynamics of Cr(VI) Removal by using Agro-Industrial Waste of Oil Palm Bagasse and Plantain Peels

2020

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The effect of temperature on the adsorption of Cr (VI) was determined with waste materials from the agroindustry, such as palm bagasse and plantain peels, by determining the thermodynamic parameters which allow to establish the mechanisms that control the process. The methodology included an initial preparation of the biomass, its characterization, and subsequent adsorption tests by setting the initial concentration of the metal to 100 ppm, a particle size of 0,5 mm, a biomass amount of 0,325 g, pH 2, and a volume of 100 mL. The process temperature varied between 303,15, and 352,15 K. The concentration of the remaining metal in the solution was performed using the diphenyl carbazide colorimetric method through a UVVis spectroscopy at a wavelength of 540 nm. The results show that the effect of temperature does not present a defined trend for palm bagasse, whereas it is linear for adsorption using plantain peels. Furthermore, the process of adsorption of Cr (VI) with palm bagasse is more favorable at higher temperatures, since it is a spontaneous process with a physical adsorption mechanism. On the other hand, the adsorption process with plantain peels is thermodynamically feasible at temperatures from 40 to 55 °C and not spontaneous at higher temperatures. Also, a physicochemical adsorption mechanism was evinced. It is concluded that the use of the studied materials is possible in the removal of the Cr (VI) ion in aqueous solutions.

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Section: Introductionmentioning

confidence: 68%

Adsorption Thermodynamics of Cr(VI) Removal by using Agro-Industrial Waste of Oil Palm Bagasse and Plantain Peels

2020

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“…The results reveal that Langmuir's model best describes the adsorption equilibrium of Pb(II) on cattle manure; however, Freundlich's model also performs well in fitting the data. Therefore, it can be said that the initial stages of the process The q max value of Langmuir's model and the n value of Freundlich's model indicate that the adsorbent has an affinity with Pb(II) ions and that the adsorption is favourable [NÚÑEZ-ZARUR et al 2018]. From the value of parameter b (dm 3 •mg -1 ), which is close to 1, it can be inferred that active adsorption centres in biomass are selective and that the ability of metals to bind to the surface depends on whether or not nearby positions are occupied [OBIKE et al 2018].…”

Section: Adsorption Isothermmentioning

confidence: 99%

Journal of Water and Land Development

2022

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In the present study, the removal capacity of Pb(II) ions was investigated using the biomass of dried cattle manure in an aqueous solution. The biomaterials were characterized using Scanning Electron Microscopy (SEM) and Energy-Dispersive X-ray Spectroscopy (EDS) techniques. The results reveal that the adsorption mechanism may be associated with the interaction between Pb(II) ions and functional groups through aggregation, coordination, ion exchange, microprecipitation, oxidation, and hydrophobicity. The bio-adsorption of the metal was analysed in discontinuous tests; the effect of temperature, pH, agitation, and adsorbent dose was evaluated. The maximum adsorption capacity was determined at pH 7.5, 18°C and 200 rpm. The bio-adsorption of Pb(II) was best fitted to the pseudo-second order model. The experimental data of the isotherm were adjusted to the models of Langmuir, Freundlich and Dubinin-Radushkevich; while Langmuir's model related better to the experimental data forming a single layer at saturation. The rate of adsorption was rapid, reaching equilibrium after 25 min and removal of 96.8%. Thermodynamic parameters determined that the process was viable, spontaneous, and exothermic. The present study contributes mainly to demonstrating that a biomaterial prepared from bovine manure is a promising adsorbent for heavy metals such as Pb(II). It also reduces the environmental impact of this waste through the generation of greenhouse gases in countries that maintain intensive livestock. Another important aspect is the reduction of the micro-and macronutrients accumulation in soil and contamination of surface waters and aquifers by runoff and seepage during rainy periods.

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“…The synthetic solution of Cr (VI) was prepared using 0.2828 g of potassium dichromate (K 2 Cr 2 O 7 ) in 1 L of deionized water to obtain a concentration of 100 ppm of the solution, which pH was 2 [23], [24].…”

Section: Preparation Of Biomass and Solutionmentioning

confidence: 99%

Determination of Kinetic Parameters in the Biosorption of Chromium (VI) in Aqueous Solution

Tovar

Ortega-Toro

2020

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he contamination of aquatic bodies by heavy metals is a growing environmental problem, making more critical the study and development of new technologies and materials that can be used for the removal of this type of pollutants. Thus, adsorption arises using residual materials as a sustainable alternative for the solution to this problem. In the present study, the use of plantain peels in the adsorption of Cr (VI) in a batch system is proposed, establishing the kinetics of the process at different temperature conditions, particle size and amount of adsorbent. The fit of the data was done using the theoretical models of pseudo-first-order, pseudo-second-order and Elovich. From the data, it is established that the pseudo-second-order and Elovich models show a better adjustment, so that the adsorption in the material occurs on two adsorption sites and that such process is related to chemical adsorption. The maximum adsorption capacity of Cr (VI) was found at a condition of 0.0306 g, 0.6775 mm and 55°C at a time of 420 min establishing the efficient use of plantain peels for the removal of the ion metallic in the studio.

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Thermodynamics, Kinetics and Equilibrium Adsorption of CR (VI) and HG (II) in Aqueous Solution on Corn Husk (Zea Mays)

Cited by 3 publications

References 50 publications

Adsorption Thermodynamics of Cr(VI) Removal by using Agro-Industrial Waste of Oil Palm Bagasse and Plantain Peels

Adsorption Thermodynamics of Cr(VI) Removal by using Agro-Industrial Waste of Oil Palm Bagasse and Plantain Peels

Journal of Water and Land Development

Determination of Kinetic Parameters in the Biosorption of Chromium (VI) in Aqueous Solution

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