Nonlinear isotherm and kinetics of adsorption of copper from aqueous solutions on bentonite

Sadeghalvad, Bahareh; Khosravi, Sara; Azadmehr, Amirreza

doi:10.1134/s0036024416110030

Cited by 13 publications

(11 citation statements)

References 25 publications

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“…The adsorption isotherms are important to describe the interaction between adsorbate and adsorbent. Several models have been published in the literature (Putra et al, 2009;Rahardjo et al, 2011;Sadeghalvad et al, 2016) to describe the experimental data of adsorption isotherms. In the systems presented in this work, Langmuir, Dual-mode model and Freundlich equations with distinct and specific assumptions were applied to understand the adsorption mechanisms involved in the equilibrium.…”

Section: Adsorption Testsmentioning

confidence: 99%

Removal of Synthetic Estrogen from Water by Adsorption on Modified Bentonites

Gallouze

Akretche

Daniel

et al. 2021

Environmental Engineering Science

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Natural bentonite is an adsorbent that can be easily modified as a low-cost material effective for the removal of persistent pharmaceutical micropollutants from water bodies. In this study, the modification of untreated bentonite by sodium is addressed to obtain Na-bent, which was further modified with L-Tryptophan (L-Trp) as well as with FeCl 2 .4H 2 O to produce Trp-Na-bent and Fe-Na-bent, respectively. The nonmodified and modified bentonite samples were tested for the adsorption of the pharmaceutical micropollutant 17aethinylestradiol (EE2) present in water bodies, a synthetic estrogen with very high toxicity. The structure of bentonite, before and after modification, was characterized using Fourier transform infrared, X-ray diffraction, Brunauer-Emmett-Teller, and thermal analysis (thermogravimetric analysis and differential scanning calorimetry) techniques. The influence of various experimental parameters on the adsorbent/adsorbate interaction was investigated. Equilibrium and kinetic studies of EE2 micropollutant adsorption were performed varying the initial adsorbate concentration, mass of bentonite, and contact time. The maximum adsorption for an initial concentration of 10 mg/L of EE2 was 4.20 mg/g, reaching the equilibrium after 2 h. The equilibrium data were fitted with Langmuir, Freundlich, and Dual-mode model equations. Adsorption kinetic data were analyzed using the pseudo-first order, pseudo-second order, and intraparticle diffusion models. The pseudosecond order model was the one that better described the kinetic data. The highest value of the equilibrium rate constant was obtained for Trp-Na-bent, followed by Fe-Na-bent. The results obtained show that the Trp-Na-bent complex exhibits a promising performance for the adsorption of EE2.

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Section: Adsorption Testsmentioning

confidence: 99%

Removal of Synthetic Estrogen from Water by Adsorption on Modified Bentonites

Gallouze

Akretche

Daniel

et al. 2021

Environmental Engineering Science

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“…The Langmuir isotherm assumes the presence of a homogeneous surface of the adsorbent and the adsorbate accumulates over it as a monolayer coverage, where all the adsorption sites are alike and energetically comparable, 69 whereas the Freundlich isotherm model is suitable for multi-layer adsorption on a heterogeneous surface of the adsorbent. 70,71 The D-R model can be applied to distinguish between chemical and the physical adsorption. 72 The Temkin isotherm model supposes that predicts monolayer sorption capacity at lower surface coverage and high concentrations of the adsorbate.…”

Section: Adsorption Analysis Studymentioning

confidence: 99%

Sustainable waste management and recycling of Zn–Al layered double hydroxide after adsorption of levofloxacin as a safe anti-inflammatory nanomaterial

et al. 2020

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“…The equation for the non-linear form of the Langmuir adsorption isotherm model is expressed as below 66,67 :…”

Section: Adsorption Isothermmentioning

confidence: 99%

Optimization and characterization of silver nanoparticle-modified luffa for the adsorption of ketoprofen and reactive yellow 15 from aqueous solutions

Tavassoli,

Cheraghi,

Etemadifar

et al. 2024

Sci Rep

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In the current work, luffa was modified with silver nanoparticles to prepare LF/AgNPs adsorbent for the elimination of ketoprofen and reactive yellow 15 (RY15) from aqueous media. Various characterization techniques, including FT-IR, XRD, BET, and SEM–EDS analysis, were employed to confirm the successful modification of LF/AgNPs. Several key parameters such as contact time, adsorbent dosage, concentration, pH, and agitation technique were fine-tuned to optimize the adsorption process. Ketoprofen removal was found to be most effective in weakly acidic conditions (pH = 5), while reactive yellow 15 adsorption was enhanced in an acidic environment (pH = 2). At 298 K, the highest adsorption capacities reached 56.88 mg/g for ketoprofen and 97.76 mg/g for reactive yellow 15. In both scenarios involving the elimination of ketoprofen and RY15, the Temkin isotherm exhibits higher R2 values, specifically 0.997 for ketoprofen and 0.963 for RY15, demonstrating a strong correlation with the observed adsorption data. Additionally, the kinetics of ketoprofen adsorption were best described by the Pseudo-first order model (R2 = 0.989), whereas the Pseudo-second order model provided the most accurate fit for reactive yellow 15 adsorption (R2 = 0.997). Importantly, the LF/AgNPs adsorbent displayed consistent performance over five consecutive reuse cycles, affirming its stability and efficacy in removing both contaminants. These findings underscore the exceptional potential of LF/AgNPs as a reliable adsorbent for the removal of reactive yellow 15 and ketoprofen from aqueous solutions.

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Nonlinear isotherm and kinetics of adsorption of copper from aqueous solutions on bentonite

Cited by 13 publications

References 25 publications

Removal of Synthetic Estrogen from Water by Adsorption on Modified Bentonites

Removal of Synthetic Estrogen from Water by Adsorption on Modified Bentonites

Sustainable waste management and recycling of Zn–Al layered double hydroxide after adsorption of levofloxacin as a safe anti-inflammatory nanomaterial

Optimization and characterization of silver nanoparticle-modified luffa for the adsorption of ketoprofen and reactive yellow 15 from aqueous solutions

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