A critical review of adsorption isotherm models for aqueous contaminants: Curve characteristics, site energy distribution and common controversies

Hu, Qili; Lan, Rui; He, Liru; Liu, Hengyuan; Pei, Xiangjun

doi:10.1016/j.jenvman.2022.117104

Cited by 80 publications

(37 citation statements)

References 142 publications

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“…Monolayer adsorption is the reversible chemical reaction in which adsorption and desorption are equal at equilibrium. 69 According to Langmuir isotherm, no additional adsorption can take place at the binding site once the dye has occupied it, and dye molecules cannot interact with one another. Similar to our results, Bassyouni et al 27 also observed that adsorption of direct blue 71 dye on nanocellulose–chitosan beads had followed both Langmuir and Freundlich sorption at different dye concentrations.…”

Section: Resultsmentioning

confidence: 99%

“…Even though the adsorption is favourable, desorption of dyes from the adsorbent would have similar characteristics with an unfavourable isotherm. 69 …”

Section: Resultsmentioning

confidence: 99%

“…Even though the adsorption is favourable, desorption of dyes from the adsorbent would have similar characteristics with an unfavourable isotherm. 69 Temkin isotherm addresses the interactions between adsorbate molecules and makes the assumption that the enthalpy of dye molecules drops linearly as the layer is covered and that the adsorption process is characterized with a uniform distribution of binding energies. The constant B, which measures the heat of adsorption was found to be positive, indicating an exothermic reaction.…”

Section: Adsorption Isothermsmentioning

confidence: 99%

“…The high R 2 value for CV (0.97) and MB (0.98) removal, indicated that the D-R isotherm is best According to D-R isotherm, the mechanism of adsorption of dye molecules in mesopores of NCC-CH is based on pore volume lling. 69 But, the nature and strength of adsorption process can be determined by calculating the free energy of adsorption (E) using the eqn (20).…”

Section: Adsorption Isothermsmentioning

confidence: 99%

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Cellulose-based hydrogel for adsorptive removal of cationic dyes from aqueous solution: isotherms and kinetics

et al. 2023

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Section: Resultsmentioning

confidence: 99%

“…Even though the adsorption is favourable, desorption of dyes from the adsorbent would have similar characteristics with an unfavourable isotherm. 69 …”

Section: Resultsmentioning

confidence: 99%

Section: Adsorption Isothermsmentioning

confidence: 99%

Section: Adsorption Isothermsmentioning

confidence: 99%

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Cellulose-based hydrogel for adsorptive removal of cationic dyes from aqueous solution: isotherms and kinetics

et al. 2023

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“…The utilization of mathematical models to fit data is a widely carried out and effective approach to investigate adsorption behavior, which involves evaluating the binding strength between the adsorbent and adsorbate and predicting the adsorption capacity of the adsorbent [ 18 ]. The adsorption isotherm, which displays the correlation between the concentration of toxic substances and the adsorption capacity, can offer a visual representation of the differences in surface properties of the adsorbent [ 19 ]. Adsorption kinetics, on the other hand, can provide valuable information on the adsorption process and the adsorption rate of toxic substances by adsorbents.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Bovine Serum Albumin on Benzo[a]pyrene Removal by Lactobacillus Strains

Xue

Sun

Liu

et al. 2023

Foods

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The aim of this study was to investigate the influence of bovine serum albumin (BSA) on the Lactobacillus-strain-mediated removal of benzo[a]pyrene (BaP). A combination of 0.5 mg/mL of BSA with 1.0 × 1010 CFU/mL bacterial cells had a removal of 49.61% BaP for strain 121, while a combination of 0.4 mg/mL of BSA with 1.0 × 1010 CFU/mL bacterial cells had a removal of 66.09% BaP for strain ML32. The results indicated that the binding of BaP to Lactobacillus-BSA was stable. BSA maintains Lactobacillus activity and BaP removal in the gastrointestinal environment. Heat and ultrasonic treatment of BSA reduced the BaP-binding ability of Lactobacillus–BSA. With the addition of BSA, the surface properties of the two strains affected BaP binding. The Fourier-transform infrared (FTIR) data demonstrated that O-H, N-H, C=O, and P=O groups were involved in the binding of BaP to Lactobacillus–BSA. Scanning electron microscopy (SEM) results revealed that the morphology of Lactobacillus–BSA bound to BaP was maintained. The adsorption of BaP by Lactobacillus–BSA was appropriately described by the pseudo-second-order kinetic model and Freundlich isotherm model. BSA enhances the affinity between the bacterial cells and BaP.

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Multiwalled carbon nanotubes@pectin/κ‐carrageenan‐based nanocomposite biohydrogel prepared by gamma irradiation for efficient methylene blue dye sequestration

Aboelkhir,

Sayed,

Eldondaity

et al. 2024

J of Applied Polymer Sci

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This study addresses the critical issue of removing toxic dyes from industrial wastewater to protect the environment and human health. To address this challenge, a bio‐based composite hydrogel was synthesized using gamma irradiation, 20 kGy, incorporating multiwalled carbon nanotubes@pectin/κ‐carrageenan/polyacrylic acid (MWCNTs PC/KC/PAAc) for removing methylene blue (MB) dye from aqueous solutions. The prepared composites underwent characterization through Fourier‐transform infrared spectroscopy, x‐ray diffraction, and thermogravimetric analyses. Brunauer–Emmett–Teller analysis demonstrated a significant increase in surface area upon the addition of MWCNTs. Specifically, the surface area increased from 342.5 m2 g−1 for PC/KC/PAAc to 689.5 m2 g−1 when 0.175&#x02009;wt% of MWCNTs were added. Also, scanning electron microscopy and atomic force microscopy were utilized to examine the surface topography of PC/KC/PAAc and MWCNTs@PC/KC/PAAc. The results reveal that at 0.175&#x02009;wt% of MWCNTs, there was a more uniform surface topography with well‐distributed MWCNTs within the matrix. In the adsorption study of MB dye, it was found that the highest MB removal efficiency was achieved at pH&#x02009;11, with values of 68.21% and 96% for PC/KC/PAAc and MWCNTs@PC/KC/PAAc, respectively. Furthermore, upon studying the effect of MWCNTs (%), the results showed that the removal (%) of PC/KC/PAAc was 68.21&#x02009;±&#x02009;1.02%, and this percentage increased rapidly with the addition of MWCNTs, reaching a maximum of 96&#x02009;±&#x02009;0.85% when 0.175 (wt%) of MWCNTs was added. Isotherm and kinetic modeling demonstrated that MB adsorption follows the Freundlich isotherm for PC/KC/PAAc and the Redlich–Peterson isotherm for MWCNTs@PC/KC/PAAc, both following a pseudo‐second‐order kinetics model. In addition, from AFM data, after MB removal, the height increased significantly from 322&#x02009;nm for PC/KC/PAAc to 810&#x02009;nm for MWCNTs@PC/KC/PAAc (0.175&#x02009;wt%), indicating a substantially higher adsorption of MB by MWCNTs@PC/KC/PAAc.

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A critical review of adsorption isotherm models for aqueous contaminants: Curve characteristics, site energy distribution and common controversies

Cited by 80 publications

References 142 publications

Cellulose-based hydrogel for adsorptive removal of cationic dyes from aqueous solution: isotherms and kinetics

Cellulose-based hydrogel for adsorptive removal of cationic dyes from aqueous solution: isotherms and kinetics

The Effect of Bovine Serum Albumin on Benzo[a]pyrene Removal by Lactobacillus Strains

Multiwalled carbon nanotubes@pectin/κ‐carrageenan‐based nanocomposite biohydrogel prepared by gamma irradiation for efficient methylene blue dye sequestration

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