Polymer–agro-waste composites for removal of Congo red dye from wastewater: adsorption isotherms and kinetics

Gonte, Renuka R.; Shelar, Gauri; Balasubramanian, K.

doi:10.1080/19443994.2013.833876

Cited by 54 publications

(29 citation statements)

References 53 publications

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“…One of the most useful models for describing such “activated” chemisorptions was the Elovich equation [ 19 ]. The plot of adsorbate concentration versus ln t for the adsorption process is shown in Figure 2 and the parameters are provided in Table 1 .…”

Section: Resultsmentioning

confidence: 99%

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Separation of Glycyrrhizic Acid and Its Derivants from Hydrolyzation in Subcritical Water by Macroporous Resin

Fan

2020

Molecules

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Glycyrrhizic acid (GL) and its derivants, glycyrrhetinic acid 3-O-mono-β-d-glucuronide (GAMG) and glycyrrhetinic acid (GA) hydrolyzed in subcritical water, are bioactive substances and edulcorators. In this work, a separation strategy for these three substances was established. The effects of adsorbent and eluent were investigated by static/dynamic adsorption and multi-stage desorption with the mechanism analysis. The adsorption of them onto EXA50 resin was well fitted by the pseudo second-order kinetic model. The optimal dynamic adsorption flow rate was 6 bed volume (BV)/h, and water of pH = 12 was used to elute GL at 4 BV/h, then n-buthanol was used subsequently to elute GA at 1 BV/h, and finally 90% ethanol was applied to elute GAMG at 2 BV/h. As a result, purities of these compounds increased, which demonstrated that this adsorption-desorption technology was simple and efficient, and indicated the potential for large-scale purification and preparation of GL and its derivants in the future.

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Section: Resultsmentioning

confidence: 99%

“…The result indicated that the nature of adsorption was chemisorption and adsorbent surface was energetically heterogeneous [ 20 ]. Similarly, the kinetic model of removing congo red dye from wastewater was described as a good correlation with the Elovich model [ 19 ].…”

Section: Resultsmentioning

confidence: 99%

Separation of Glycyrrhizic Acid and Its Derivants from Hydrolyzation in Subcritical Water by Macroporous Resin

Fan

2020

Molecules

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“…Several adsorption isotherms originally used for gasphase adsorption are available and readily adopted to correlate adsorption equilibria in heavy metals adsorption. Some well-known ones are Freundlich, Langmuir, Temkin, Redlich-Paterson and Sips equations (Febrianto et al 2009;Gonte et al 2013b;Gonte and Balasubramanian 2013). In this study, the experimental equilibrium data for adsorbed metal ions onto nano-iron oxide (Fe 2 O 3 )-impregnated cellulose acetate beads were analysed using the Langmuir, Freundlich, Temkin and D-R models.…”

Section: Isotherm Studiesmentioning

confidence: 99%

“…The adsorption isotherm indicates how the adsorption molecules distribute between the liquid phase and the solid phase when the adsorption process reaches an equilibrium state. The adsorption mechanism and adsorbent's affinity for the metal ion can be determined by analysing the physicochemical parameters (Bulut et al 2008;Febrianto et al 2009;Gonte et al 2013b;Gonte and Balasubramanian 2013). There are several isotherm equations available for analysing experimental adsorption equilibrium data.…”

Section: Isotherm Studiesmentioning

confidence: 99%

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Kinetic and isotherm analysis for selective thorium(IV) retrieval from aqueous environment using eco-friendly cellulose composite

Bhalara

Punetha

Balasubramanian

2014

Int. J. Environ. Sci. Technol.

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Thorium reclamation was studied using nanoiron oxide-impregnated cellulose acetate beads to gain insights into the adsorption mechanism, kinetics and thermodynamics. The designed experiments were thoroughly investigated as a function of solution pH, initial thorium(IV) ion concentration, adsorbent dose and nano-iron oxide loading in the cellulose acetate matrix. The batch adsorption of Th(IV) ions revealed the highly pH dependent (pH range 3.0-9.0) behaviour with maximum sorption at pH 6.0 and equilibrium being achieved within 2 h for maximum concentration of 100 mg/L at 298 K. Rapid adsorption of 50 ± 0.2 % was observed within first 10 min. The kinetics data are best described by the pseudofirst-order kinetic model (R 2 = 0.9996) and intraparticle diffusion model. The equilibrium adsorption process was fitted with the Langmuir, Freundlich, Dubinin-Radushkevich and Temkin models which yield good fit with Langmuir isotherm equation indicating monolayer adsorption process. The calculated thermodynamics parameter reveals spontaneous and exothermic adsorption process. Further, the desorption was Th(IV) ions that was easily achieved using 0.05 N HNO 3 which suggests the reusability of the adsorbent for multiple use.

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Application of Electrospun Materials in Water Treatment

Rastogi

Kandasubramanian

2020

Electrospun Materials and Their Allied Applications

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Polymer–agro-waste composites for removal of Congo red dye from wastewater: adsorption isotherms and kinetics

Cited by 54 publications

References 53 publications

Separation of Glycyrrhizic Acid and Its Derivants from Hydrolyzation in Subcritical Water by Macroporous Resin

Separation of Glycyrrhizic Acid and Its Derivants from Hydrolyzation in Subcritical Water by Macroporous Resin

Kinetic and isotherm analysis for selective thorium(IV) retrieval from aqueous environment using eco-friendly cellulose composite

Application of Electrospun Materials in Water Treatment

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