Trivalent chromium removal from aqueous solution with physically and chemically modified corncob waste

Fonseca-Correa, Rafael A.; Giraldo, Liliana; Moreno–Piraján, Juan Carlos

doi:10.1016/j.jaap.2013.01.019

Cited by 44 publications

(19 citation statements)

References 38 publications

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“…For this reason once it is estimated the Δ DIF Ni(II) relates to the content of carboxylic groups on the solid surface and with the total acidity that this presents. Figure 6 Relations show a similar behavior for the solutions with mass fractions of 2 and 40 for the change in the differential enthalpy ion are between −0.87 and −1.73 J but when the ion concentration increases the change in the enthalpy becomes larger and is marked by two trends: for the carbonized less oxidized solids the difference of enthalpy decreases and for solids with greater oxidation values the enthalpy differential is nearby; the above indicates that the solid interactions with ion in the mixture are intensified with the presence of oxygen groups, as shown by different works that determine the metal ions adsorption capacity in aqueous solution on solid adsorbents [15][16][17]. It is noted that Δ DIF Ni(II) is sensitive to the ion quantity present in the mixture and to the solid surface chemistry.…”

Section: Resultsmentioning

confidence: 94%

“…It is known that the interaction between metal ions that are in aqueous solution and a solid adsorbent has different influences, including the oxygen groups content of the solid surface [15]. For this reason once it is estimated the Δ DIF Ni(II) relates to the content of carboxylic groups on the solid surface and with the total acidity that this presents.…”

Section: Resultsmentioning

confidence: 99%

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Enthalpic Contribution of Ni(II) in the Interaction between Carbonaceous Material and Aqueous Solution

Giraldo

Moreno–Piraján

2017

Journal of Chemistry

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Solid adsorbents were prepared from corn cob that was modified with a solution of HNO 3 6 M at different contact times. The solids are characterized by physical N 2 adsorption at 77 K to know their surface area by applying the BET model and surface chemistry is determined using the Bohem method. Once we have prepared the adsorbents we determine the immersion enthalpy, Δ im , of the solids in Ni(II) aqueous solutions of different concentrations between 20 and 800 mg⋅L −1 , with values for Δ im between 10.0 and 35.3 J⋅g −1 . From the results obtained for the immersion enthalpy in function of the ion Ni(II) concentration we calculate the contribution to the immersion enthalpy that corresponds to the ion when it is treated with the system adsorbent-solution as a mixture in which the solid, the solvent, and the adsorbate are involved. The solution thermodynamics allows for establishing the enthalpic changes that bring the ion in function of the concentration and the intensity of the interaction of solid-metal ion that is favored by the presence of acid groups in the solid.

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Section: Resultsmentioning

confidence: 94%

Section: Resultsmentioning

confidence: 99%

Enthalpic Contribution of Ni(II) in the Interaction between Carbonaceous Material and Aqueous Solution

Giraldo

Moreno–Piraján

2017

Journal of Chemistry

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“…Figures 2 and 3 show the granulated sorbent and the photo of its surface. Apart from being used for dye sorption, corncobs are also reported to be widely used for removal of heavy metals from aqueous solutions [13][14][15][16]. Corncobs are also equally commonly used to obtain activated carbon [17][18][19][20][21].…”

Section: Methodsmentioning

confidence: 99%

Sorption dynamics of Direct Orange 26 dye onto a corncob plant sorbent

Tomczak

Blus

2016

Ecological Chemistry and Engineering S

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Abstract:The azo dye and plant-derived sorbent system was investigated in this paper. Direct Orange 26 azo dye was acquired from Boruta-Zachem Kolor Sp. z o.o. Chemically modified granulated corncobs obtained from Chipsi Mais Germany were used as the biosorbent. The changes in the dye and sorbent concentrations with time were measured and used for further calculations. The experiments were carried out in a laboratory fixed bed column. Breakthrough curves were plotted for different initial concentrations, volumetric flow rates and bed heights. Sorption dynamics was described by a model presented in the literature. It was demonstrated that Infrared analysis of the system allows to determine the nature of the dye-sorbent bond. It was found that corncobs can be used as a promising sorbent material.

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“…Below pH 2.0, the predominant specie is Cr 3+ , at pH 5.0, Cr(OH) 2+ species dominates accounting for 70% of the total Cr(Ⅲ). 24 It could be concluded that Cr(Ⅲ) was principally adsorbed as the form of Cr(OH) 2+ on G-MMT nanocomposite, while the form of Cr 3+ was 25 weakly adsorbed. Effect of temperature on Cr(Ⅲ Ⅲ Ⅲ Ⅲ) adsorption Fig.…”

Section: Characterization Of G-mmt Nanocompositementioning

confidence: 95%

Adsorption performance of low-cost gelatin–montmorillonite nanocomposite for Cr(iii) ions

et al. 2015

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The gelatin-montmorillonite (G-MMT) nanocomposite was prepared by Na-montmorillonite (Na-MMT) and the biomaterial gelatin through intercalation method. Samples were studied by XRD and FTIR and the results indicated that gelatin has been successfully intercalated into the interlayers of MMT. The effect of G-MMT nanocomposite adsorbed Cr(Ⅲ) from aqueous solution was investigated in terms of the initial concentration of Cr( Ⅲ ), adsorption temperature and solution pH. The maximum adsorption 10 capacity was 52.91 mg⋅g -1 for an initial Cr(Ⅲ) concentration of 300 mg⋅L -1 , temperature of 343 K and pH value of 5.5. Furthermore, kinetic and isotherm models were used for the description of the adsorption process. The results demonstrated that the adsorption process was fitted to pseudo-second-order kinetic model and the equlibrium data gave good fits with both Freundlich and Langmuir equations. The thermodynamic study revealed the endothermic and non-spontaneous nature of the adsorption process, 15 and the increased randomness at the solid-solution interface.

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Trivalent chromium removal from aqueous solution with physically and chemically modified corncob waste

Cited by 44 publications

References 38 publications

Enthalpic Contribution of Ni(II) in the Interaction between Carbonaceous Material and Aqueous Solution

Enthalpic Contribution of Ni(II) in the Interaction between Carbonaceous Material and Aqueous Solution

Sorption dynamics of Direct Orange 26 dye onto a corncob plant sorbent

Adsorption performance of low-cost gelatin–montmorillonite nanocomposite for Cr(iii) ions

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