Adsorption of lysozyme from aqueous solutions by a novel bentonite–tyrptophane (Bent–Trp) microcomposite affinity sorbent

Kalburcu, Tülden; Tabak, Ahmet Fatih; Öztürk, Nevra; Tüzmen, Nalan; Akgöl, Sinan; Çağlar, Bülent; Deni̇zli̇, Adil

doi:10.1016/j.molstruc.2014.11.055

Cited by 22 publications

(20 citation statements)

References 46 publications

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“…S4c) compared with that of Nabent is because the pores and interlayer spacing are covered by the L-Trp molecule, which results in the inaccessibility of the internal surface to the nitrogen gas. Similar results have been found in the literature (Kalburcu et al, 2014;Zaghouane-Boudiaf et al, 2014). In the Fe-Na-bent (Supplementary Fig.…”

Section: Characterization Of the Adsorbentssupporting

confidence: 91%

“…S1c) was determined as 15.04 Å at 2h = 5.87°. This increase is due to the impregnation of the L-Trp molecule into the Na-bent interlayer space, in agreement with the results reported by Kalburcu et al (2014). In the case of Fe-Na-bent ( Supplementary Fig.…”

Section: Characterization Of the Adsorbentssupporting

confidence: 91%

“…3 show that Trp-Na-bent has the highest adsorption capacity for the EE2 per unit mass of adsorbent. This Trp-Nabent behavior, in comparison to the other adsorbents, is probably due to its larger basal spacing value (Kalburcu et al, 2014) and also due to its amphoteric character that could change the adsorption capacity and selectivity depending on of the medium conditions. Moreover, it was found that the adsorption of EE2 per unit mass of adsorbent remains constant for amounts of adsorbent higher than 0.8 mg.…”

Section: Optimization Of the Ee2 Adsorption Parametersmentioning

confidence: 93%

“…Bentonite was selected for this study based on its lack of toxicity, high specific surface area, cation exchange ability, hydration, swelling, and presence of specific active sites and hydrophilicity that allow for easy fixation of biomolecules and the adsorption of a large diversity of substances, namely organic micropollutants (Orolínová et al, 2012;Kalburcu et al, 2014). Moreover, bentonite is a low-cost material, *0.17e/kg, being its price near 2 orders of magnitude lower in comparison to other adsorbents: activated carbon (*7e/kg), activated alumina (*8.5e/kg), and molecular sieves (*11e/kg).…”

Section: Introductionmentioning

confidence: 99%

“…This material is composed of a clay mineral layered structure of montmorillonite, with quartz and calcite as main impurities. The layer structure consists of sheets of octahedral alumina and tetrahedral silica shared in a 2:1 ratio (Bilgiç et al, 2014;Kalburcu et al, 2014). Montmorillonite can be described as…”

Section: Introductionmentioning

confidence: 99%

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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: Characterization Of the Adsorbentssupporting

confidence: 91%

Section: Characterization Of the Adsorbentssupporting

confidence: 91%

Section: Optimization Of the Ee2 Adsorption Parametersmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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