Adsorption isotherm models: Classification, physical meaning, application and solving method

Wang, Jianlong; Guo, Xuan

doi:10.1016/j.chemosphere.2020.127279

Cited by 1,037 publications

(422 citation statements)

References 185 publications

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“…Adsorption isotherm studies are performed to reflect the performance of adsorbents in adsorption processes. Many isotherms are well-known (Wang and Guo, 2020) and in this study, Langmuir and Freundlich are used to determine the adsorption equilibrium between the adsorbent and the metal ion. The Langmuir isotherm model assumes that a monomolecular layer is formed when adsorption takes place without any interaction between the adsorbed molecules.…”

Section: Adsorption Isothermmentioning

confidence: 99%

Removal of cadmium from aqueous solution using modified magnetic glycine modified cross-linked chitosan resin

Mohamed¹,

Hamouda²,

Kader³

et al. 2021

Egypt. J. of Aquatic Biolo. and Fish.

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Water is the most vital substance for life on the earth and a precious resource for human civilization for many critical areas such as: food, energy, industrial, and the environment. Water resources are increasingly decreasing and need to be preserved. In recent years, industrialization, agricultural activities, rapid population growth and urbanization have contributed negatively to clean water resources (Ali et al., 2018; Basheer, 2018). Different pollutants such as pharmaceuticals, pesticides, dyes and heavy metals have contaminated the water resources. Presence of these contaminants in aqueous environments is environmentally hazardous for human beings and animals. Among these pollutants, heavy metal is one of the most hazardous species, due to their toxic nature especially when their concentrations exceed the allowable limits in the ecosystem. These pollutants are non-biodegradable and can be absorbed by marine life. Once high concentrations of heavy metals enter the food chain, they tend to accumulate in living tissues and thus, dysfunction the system of the human bodies (Fu, 2011).

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Section: Adsorption Isothermmentioning

confidence: 99%

Removal of cadmium from aqueous solution using modified magnetic glycine modified cross-linked chitosan resin

Mohamed¹,

Hamouda²,

Kader³

et al. 2021

Egypt. J. of Aquatic Biolo. and Fish.

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“…Adsorption isotherms provide the means to characterize the adsorbent–adsorbate interactions in order to specify the adsorption mechanism [36] . In this study, experimental data were analyzed according to Langmuir , Freundlich and Temkin models [37] …”

Section: Resultsmentioning

confidence: 99%

New Bio‐Based Furanic Materials Effectively Absorb Metals from Water and Exert Antimicrobial Activity

Klushin

Кашпарова

Chizhikova

et al. 2021

Chemistry A European J

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Development of sustainable bio‐based materials for removal of toxic contaminants from water is a high priority goal. Novel bio‐based binary and ternary copolymers with enhanced ion‐exchange, adsorption and antibacterial properties were obtained by using plant biomass‐derived diallyl esters of furandicarboxylic acid (FDCA) as crosslinking agents and easily available vinyl monomers. The synthesized copolymer materials showed higher sorption capacities for NiII, CoII and CuII compared to the commercial ion‐exchange resins, and they maintained their high metal adsorption capacities for over 10 cycles of regeneration. The synthesized copolymer gels containing 1–5 wt % of the crosslinker showed excellent water absorption capacities. The synthesized copolymers with 1 % crosslinker content showed swelling ratios high enough to also act as moisture absorbents. Synthesized copolymers with crosslinker content of 10 wt % performed as contact‐active antibacterials by inhibiting the growth of Gram‐positive (S. aureus) and Gram‐negative bacteria (E. coli, K. pneumonia) in suspension tests.

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“…The applicability of the model is compared by considering the correlation coefficient (R 2 ) values. The linearized form of isotherm models is as follows [ 44 , 45 , 46 ]. Langmuir model equation—C e /Q e = 1/Q m. K b + C e /Q m Freundlich model equation—lnQ e = lnk + (1/n) lnC e Temkin model equation—Q e = B ln a T + B lnC e where B =

Dubinin-Radushkevich model—ln Qm – KE 2 where C e is the equilibrium concentration (mg L −1 ), Q e is the amount adsorbed (mg g −1 ).…”

Section: Resultsmentioning

confidence: 99%

Aminophosphonic Acid Functionalized Cellulose Nanofibers for Efficient Extraction of Trace Metal Ions

et al. 2020

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Cellulose nanofibers were covalently functionalized using diethylenetriamine penta (methylene phosphonic acid) and studied for the extraction of heavy metal ions. The surface-functionalized nanofibers showed a high adsorption capacity towards heavy metal ions as compared to bare nanofibers. The elemental composition and surface morphology of the prepared bio-adsorbent was characterized by X-ray photoelectron spectroscopy, attenuated total reflectance infrared spectroscopy, field emission scanning electron microscopy, and energy dispersive spectroscopy. The prepared material was studied to develop a column-based solid phase extraction method for the preconcentration of trace metal ions and their determination by inductively coupled plasma optical emission spectroscopy. The batch experimental data was well fitted to Langmuir adsorption isotherms (R2 > 0.99) and follows pseudo-second-order kinetics. The experimental variables such as sample pH, equilibrium time, column breakthrough, sorption flow rate, the effect of coexisting ions, and eluent type were systematically studied and optimized accordingly. The detection limit of the proposed method was found to be 0.03, 0.05, and 0.04 µg L−1 for Cu(II), Pb(II), and Cd(II), respectively. Certified Reference Materials were analyzed to validate the proposed method against systematic and constant errors. At a 95% confidence level, the Student’s t-test values were less than the critical Student’s t value (4.302). The developed method was successfully employed for the preconcentration and determination of trace metal ions from real water samples such as river water and industrial effluent.

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Adsorption isotherm models: Classification, physical meaning, application and solving method

Cited by 1,037 publications

References 185 publications

Removal of cadmium from aqueous solution using modified magnetic glycine modified cross-linked chitosan resin

Removal of cadmium from aqueous solution using modified magnetic glycine modified cross-linked chitosan resin

New Bio‐Based Furanic Materials Effectively Absorb Metals from Water and Exert Antimicrobial Activity

Aminophosphonic Acid Functionalized Cellulose Nanofibers for Efficient Extraction of Trace Metal Ions

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