Kinetics and thermodynamics adsorption of Oxazepam drug on the multi‐walled carbon nanotube

Mohammadi, Majid; Vadi, Mehdi; Bagehri, N.; Shekoohi, Khadijeh; Younessi, Floura

doi:10.1002/jccs.202000407

Cited by 9 publications

(3 citation statements)

References 21 publications

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“…The adsorption–desorption process is performed for five adsorption cycles using 50 ml of 0.1 M NaOH as the desorption eluent at optimized parameter conditions. [ 51,52 ] The adsorption efficiency of each cycle is analyzed and is depicted in Figure 6c. It can be observed that Cr(VI) removal declines as the cycle progresses due to the saturation and loss of active adsorption sites.…”

Section: Resultsmentioning

confidence: 99%

Batch and continuous studies on adsorptive removal of hexavalent chromium [Cr(VI)] using reduced graphene oxide

Rout

Jena

2022

J Chinese Chemical Soc

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In this study, the reduced form of graphene oxide (RGO) has been synthesized by using hydrazine hydrate as a reducing agent and used for Cr(VI) removal. The physicochemical properties of the as‐synthesized material were studied by FESEM, XRD, RAMAN, and FTIR. The optimized adsorption parameters were time of 75 min, solution pH 3.0, temperature 35°C, and dosage of 0.3 g/l. The isotherms were perfectly simulated by the Langmuir model, and the kinetic data followed the pseudo‐second‐order model. The maximum uptake capacity was 787.401 mg/g at 35°C. Thermodynamic analysis indicated an endothermic and spontaneous process occurs. Competition from interfering ions (SO42−, NO3−, Cl−, HCO3−, Co2+, and Cu2+) proved insignificant. After five cycles of regeneration, the removal remains at 85.75%. From the column study, it was observed that the parameters like breakthrough time (tb), bed capacity (qbed), and exhaustion time (te) increase with an increase in bed height and decrease with an increase in Cr(VI) flow rate. Adsorption performance for industrial effluents shows up to 55.32% removal. The above superior adsorption performance validated the application of the RGO as an efficient adsorbent for the remediation of Cr(VI) ions from wastewater.

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Section: Resultsmentioning

confidence: 99%

Batch and continuous studies on adsorptive removal of hexavalent chromium [Cr(VI)] using reduced graphene oxide

Rout

Jena

2022

J Chinese Chemical Soc

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“…In order to study the relation between the adsorbate concentrations in the solid and liquid phases at a constant temperature, adsorption isotherms, which are mathematical equations, were investigated. [42,43] Langmuir, Freundlich, and Dubinin-Radushkevich (D-R) are isotherm models which are presented in Table 7 along with their calculated parameters. All plots of adsorption isotherms are shown in Figures S6-S8.…”

Section: Adsorption Isothermsmentioning

confidence: 99%

The picric acid removal from aqueous solutions by multi‐walled carbon nanotubes/EDTA/carboxymethylcellulose nanocomposite: Central composite design optimization, kinetic, and isotherm studies

Azadfar

Tahermansouri

Qomi

2021

J Chinese Chemical Soc

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The removal of hazardous picric acid is of great importance to making healthy and drinkable water. In this research, a nanocomposite (MWCNT-EDTA-CMC) based on carboxylated multiwall carbon nanotubes (MWCNT-COOH) modified by carboxymethylcellulose (CMC) and ethylenediamintetraacetic acid (EDTA) was prepared for adsorption and removal of picric acid from aqueous solutions. MWCNT-EDTA-CMC was characterized by Fourier transform infrared (FT-IR), field-emission scanning electron microscopy (FESEM), thermal gravimetric analysis (TGA). Central composite design (CCD) was used to study the influence of pH, adsorbent dosage, and initial picric acid concentrations on the removal percentage of picric acid. At optimum conditions (pH 3.0, MWCNT-EDTA-CMC dosage 0.050 g, picric acid concentration 30 mg L À1 ), high removal efficiency (97.67%) was obtained for picric acid which was reasonably well predicted by the model. The adsorption process was demonstrated by the pseudo-second-order kinetic and Freundlich isotherm models for both adsorbents. In addition, the consumed MWCNT-EDTA-CMC could be reused up to 3th cycle of regeneration.adsorption, carbon nanotube, central composite design, desorption, picric acid 1 | INTRODUCTION 2,4,6-trinitrophenol or picric acid is one of the most acidic phenols which is an explosive material like other strongly nitrated organic compounds. [1] It has also been used in the production of explosives, medicine, dyes, fungicides, and the oxidation of metal surfaces. [2][3][4] Hence, in during these processes, it could release into the environment such as the atmosphere, water, and soil and thus, cause serious health problems for example lung, liver, and kidney damages or an allergic skin reaction since picric acid is toxic if swallowed, inhaled, or absorbed through the skin. [5][6][7] Industrially, picric acid is especially hazardous because it is volatile and slowly sublimes even at room temperature. So, the removal of picric acid from aqueous solutions has been a major focus of research and is vital.Up to now, various methods for instance, degradation, [8] oxidative destruction, [9] solvent extraction, [10] biodegradation, [11] electrochemical, [12] and adsorption [13] were applied to remove picric acid. In the middle of these methods, adsorption process has been recognized as one of the major methods for picric acid removal since this process is commonly easy to handle, cost effectiveness, high efficiency,

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“…Multiwalled carbon nanotubes (MWCNTs) have a hollow tubular structure with a large specific surface area, and hence, they exhibit strong surface adsorption ability. , MWCNTs have high chemical stability and good biocompatibility and are easy to functionalize. , The surface properties of MWCNTs and the structures and properties of adsorbates together determine the behavior of MWCNTs. For example, surfactants can adsorb on the surface of MWCNTs through noncovalent interactions, which improves the stability and dispersibility of MWCNTs in water, and also changes the absorption behavior of MWCNTs. ,, …”

Section: Introductionmentioning

confidence: 99%

Selectivity of PEG/Salt Aqueous Two-Phase System Enhanced by Surfactant@MWCNT Composites

Liu,

Cheng,

et al. 2024

Langmuir

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Aqueous two-phase systems (ATPS) are considered a new type of green separation system, but their low selectivity to target molecules limits their practical application. In this study, we used surfactant@MWCNT as an adjuvant to improve the selectivity of PEG/(NH 4 ) 2 SO 4 ATPS. The surfactants used include Triton X-100 (TX-100), Tween 80, sodium dodecyl sulfate (SDS), sodium dodecyl benzenesulfonate (SDBS), and bis(2-ethylhexyl)sulfosuccinate sodium salt (AOT). Nine aromatic compounds, including syringic acid, vanillin, tryptophan, phenylalanine, tyrosine, mandelic acid, theophylline, theobromine, and cephalexin, were selected as model extracts. The results showed that the use of the surfactant@MWCNT composite as an adjuvant significantly improved the selectivity of the ATPS toward syringic acid among the nine extracts. Moreover, the selectivity of the ATPS for syringic acid with the TX-100/MWCNT composite as the adjuvant is better than that with the Tween 80/MWCNT composite as the adjuvant, followed by that with the anionic surfactant/ MWCNT composite as the adjuvant. The enhanced selectivity of ATPS by the surfactant/MWCNT composite is ascribed to the spatial effect and the electrostatic and hydrophobic interactions between the extract and the surfactant adsorbed on the MWCNT.

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Kinetics and thermodynamics adsorption of Oxazepam drug on the multi‐walled carbon nanotube

Cited by 9 publications

References 21 publications

Batch and continuous studies on adsorptive removal of hexavalent chromium [Cr(VI)] using reduced graphene oxide

Batch and continuous studies on adsorptive removal of hexavalent chromium [Cr(VI)] using reduced graphene oxide

The picric acid removal from aqueous solutions by multi‐walled carbon nanotubes/EDTA/carboxymethylcellulose nanocomposite: Central composite design optimization, kinetic, and isotherm studies

Selectivity of PEG/Salt Aqueous Two-Phase System Enhanced by Surfactant@MWCNT Composites

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