Thermodynamic parameters for adsorption equilibrium of heavy metals and dyes from wastewater with low-cost adsorbents

Ramesh, A.; Lee, D. J.; Wong, Jonathan W C

doi:10.1016/j.jcis.2005.04.084

Cited by 131 publications

(70 citation statements)

References 44 publications

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“…The basic problem is the designation of the entropy of adsorption, which is usually overlooked in this type of work. These capabilities only exist when the use of the thermodynamic equilibrium constant is skipped, e.g., (Madamba et al 1996;Beristain et al 1996;Al-Muhtaseb et al 2004, 2007Pedro and Babas 2005;Ramesh et al 2005;Tang et al 2006;Palomino et al 2008;Musa et al 2010;Loto et al 2012) as these cases do not require comments, and for non-pressure processes, when P/P o < 1.…”

Section: Purpose and Scope Of Studiesmentioning

confidence: 99%

Enthalpy–entropy compensation for isosteric state adsorption at near ambient temperatures

Mianowski

Urbańczyk

2017

Adsorption

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List of symbols AbstractThe adsorption process at near ambient temperatures indicated that the EEC (enthalpy-entropy compensation) is affected by three basic thermodynamic values: ∆H, ∆S and T. The consequence is that it is possible to determine an isosteric straight (symbol H − S) without experimental studies based on the slope coefficient T iso , which is the constant arising from the expected temperature range (about 0-60 °C). Therefore, EEC curves can be obtained by appropriate modification of the temperature range. In the case of entropy of adsorption, the decisive influence is the entropy of gas. For visualization and characterization of this impact, we proposed resolute pointer µ (Eq. 25), through which it is observed that for small values of the equilibrium vapor pressure, as P → 0, there are significant deviations from the isosteric straight H − S. The case where P → P 0 followed a gradual grouping of experimental data in accordance with the relationship with H − S. We used the three-parameter equation for exothermic processes. For the extrapolated conditions, the so-called point of zero adsorption represented the enthalpy and entropy of adsorption, whose values are analogous to previous results in the literature, which can be considered an appropriate analytical method to determine these two thermodynamic values.

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Section: Purpose and Scope Of Studiesmentioning

confidence: 99%

Enthalpy–entropy compensation for isosteric state adsorption at near ambient temperatures

Mianowski

Urbańczyk

2017

Adsorption

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“…The application of low-cost natural adsorbents including carbonaceous materials, agricultural products and waste by-products has been investigated in many previous studies (Ajaero, et al, 2010;El -Nemr et al, 2008;Ramesh et al, 2005), which have been recognized as potential alternative to the conventional technologies such as precipitation, ion exchange, solvent extraction and liquid membrane for removal of heavy metals from industrial wastewater because these processes have technical and/or economical constraints (Wu et al, 2008). Several studies have shown that non-living plant biomass materials are effective for the removal of trace metals from the environment (Elaigwu et al, 2009;Wang and Lin, 2008).…”

Section: Introductionmentioning

confidence: 99%

Remediation of Cr and Fe from aqueous solution by natural adsorbents

Ibrahim¹,

Jimoh²

2011

International Journal of Biological and Chemical Sciences

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Different kinds of low-cost agro based fibres can be used to remove both trace and heavy metals from aqueous solutions. The removal efficiency of maize (Zea mays) cob, sawdust and coal coded as MC, SD and CO respectively was investigated in this study for the bioremediation of chromium and iron. Sorption experiments were carried out using batch process in which changes in concentration of the adsorbates were monitored by the use of Shimadzu AA650 Double Beam Atomic Absorption/Flame spectrophotometer. Effects of varying adsorbent dose, adsorbate loading concentration, pH, and adsorbent surface area were studied. At optimum adsorbent dose, remediation of Cr varies according to CO > SD > MC, while that of Fe varies according to MC > CO > SD. However, on individual adsorbents the remediation efficiency is; on MC Cr has 48.5% while Fe has 100%, while on SD Cr has 97.85% while Fe has 95% and lastly on CO Cr has 98.57% and Fe has 98%. This shows that the adsorbent can selectively be employed for the remediation of the ions from the solutions.

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“…Where q e is the equilibrium metal ion concentration on the adsorbent (mg/g), C e is the equilibrium metal ion ) strongly support the fact that metaladsorbent adsorption data closely fit the model [24]. A linear relationship is shown between the amount of lead and cadmium ions (mg) sorbed per unit mass of carrot residue (g) against the concentration of lead and cadmium ions in the remaining solution (mg/L).…”

Section: Adsorption Isotherm Modelsmentioning

confidence: 55%

Biosorptive removal of lead and cadmium ions from aqueous solution: The use of carrot residues as low cost non-conventional adsorbent

Ata¹,

Wattoo²,

Sidra³

et al. 2012

Turk J Bioch

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Thermodynamic parameters for adsorption equilibrium of heavy metals and dyes from wastewater with low-cost adsorbents

Cited by 131 publications

References 44 publications

Enthalpy–entropy compensation for isosteric state adsorption at near ambient temperatures

Enthalpy–entropy compensation for isosteric state adsorption at near ambient temperatures

Remediation of Cr and Fe from aqueous solution by natural adsorbents

Biosorptive removal of lead and cadmium ions from aqueous solution: The use of carrot residues as low cost non-conventional adsorbent

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