Adsorption of metronidazole and spiramycin by an Algerian palygorskite. Effect of modification with tin

Habibi, Abderrahman; Belaroui, Lala Setti; Bengueddach, Abdelkader; Galindo, Alberto; Díaz, Claro Ignacio Sainz; Peña, Aránzazu

doi:10.1016/j.micromeso.2018.04.020

Cited by 42 publications

(26 citation statements)

References 48 publications

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Section: Adsorption Thermodynamicsmentioning

confidence: 74%

“…Furthermore, the higher value of parameter α obtained by Elovich equation (Table 3) suggests that there is a strong affinity between the recalcitrant compounds containing S and the active sites of AgNO 3 /MCM-41 M adsorbent, strengthening the hypothesis that this adsorption is highly influenced by Ag sites and its different active forms (Ag(0) and Ag-O), and mainly occurs via π-complexation and oxidation [47,48]. The slower adsorption rate after the initial minutes may be a reflection of concurrent kinetic mechanisms [46]. For pure MCM-41 M , the experimental results were better fitted to the pseudo-second order model, with R 2 > 0.89 and calculated q e (1.60 mg/g) close to the experimental result (1.64 mg/g).…”

Section: Kinetic Studymentioning

confidence: 76%

“…Although the process is not spontaneous, it can be noticed that there is a tendency of increasing spontaneity by increasing the adsorption temperature, since the total free energy (ΔG°) of the system decreases. Finally, the positive entropy (ΔS°) confirms the affinity of the adsorbent to S-compounds [46,56]. The data from the kinetic, equilibrium and thermodynamic tests reinforce the results observed in XPS spectra ( Figure 5) for AgNO3/MCM-41 M and Ag2O/MCM-41 M materials before and after desulfurization, where stable Ag2O species apparently did not interact with DBT molecules and only bridging bonds occurred between Ag (0) sites and the organosulfur rings (Ag-S-R), while active Ag-O species and Ag(0) nanodomains concurrently participate for adsorbing the contaminants via oxidation reactions and bridging interactions via π-complexation on the non-calcined adsorbent, visibly increasing the process efficiency.…”

Section: Adsorption Thermodynamicsmentioning

confidence: 84%

“…Experimental results of sulfur removal on AgNO 3 /MCM-41 M adsorbent were better fitted to the pseudo-second order model, with R 2 > 0.99 and similar calculated and experimental q e values (7.31 mg/g and 7.26 mg/g, respectively), followed by Elovich (R 2 = 0.977) and pseudo-first order (R 2 = 0.814) models, respectively. The best data fitting to the pseudo-second order and Elovich models is a clue that the chemisorption process is the rate determining step of adsorption [46]. Furthermore, the higher value of parameter α obtained by Elovich equation (Table 3) suggests that there is a strong affinity between the recalcitrant compounds containing S and the active sites of AgNO 3 /MCM-41 M adsorbent, strengthening the hypothesis that this adsorption is highly influenced by Ag sites and its different active forms (Ag(0) and Ag-O), and mainly occurs via π-complexation and oxidation [47,48].…”

Section: Kinetic Studymentioning

confidence: 99%

“…The generated models are used to explain the adsorption mechanism characteristics. Pseudo-first-order (Equation (2)), pseudo-second-order (Equation (3)), Elovich (Equation (4)), intra-particle diffusion (Equation (5)) and the film-diffusion model of Boyd (Equation (6)) were used to analyze the experimental data using the following equations [46]:…”

Section: Kinetic Testsmentioning

confidence: 99%

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Assessment of Ag Nanoparticles Interaction over Low-Cost Mesoporous Silica in Deep Desulfurization of Diesel

et al. 2019

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Chemical interactions between metal particles (Ag or Ni) dispersed in a low-cost MCM-41 M produced from beach sand amorphous silica and sulfur compounds were evaluated in the deep adsorptive desulfurization process of real diesel fuel. N 2 adsorption-desorption isotherms, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), high-resolution transmission electron microscopy (HRTEM) and scanning transmission electron microscopy coupled to energy-dispersive X-ray spectroscopy (STEM-EDX) were used for characterizing the adsorbents. HRTEM and XPS confirmed the high dispersion of Ag nanoparticles on the MCM-41 surface, and its chemical interaction with support and sulfur compounds by diverse mechanisms such as π-complexation and oxidation. Thermodynamic tests indicated that the adsorption of sulfur compounds over Ag(I)/MCM-41 M is an endothermic process under the studied conditions. The magnitude of ∆H • (42.1 kJ/mol) indicates that chemisorptive mechanisms govern the sulfur removal. The best fit of kinetic and equilibrium data to pseudo-second order (R 2 > 0.99) and Langmuir models (R 2 > 0.98), respectively, along with the results for intraparticle diffusion and Boyd's film-diffusion kinetic models, suggest that the chemisorptive interaction between organosulfur compounds and Ag nanosites controls sulfur adsorption, as seen in the XPS results. Its adsorption capacity (q m = 31.25 mgS/g) was 10 times higher than that obtained for pure MCM-41 M and double the q m for the Ag(I)/MCM-41 C adsorbent from commercial silica. Saturated adsorbents presented a satisfactory regeneration rate after a total of five sulfur adsorption cycles. catalysts. However, some recalcitrant organosulfur such as thiophene derivatives are not removed by this method [4].Methods based on membrane separation [5], catalytic oxidation [3], biological desulfurization [6], and adsorption [1,[7][8][9][10][11] have been developed for desulfurizing fuels. Among these techniques, adsorptive desulfurization stands out due to its simplicity, efficiency and low-cost according to the solid chosen as the adsorbent. Activated carbon [1], MOFs [9], , , and MCM-41 [7,11] are currently being investigated for sulfur adsorption from liquid fuels, among other materials.These molecular sieves, especially MCM-41, are extensively applied as supports for adsorbents and heterogeneous catalysts due to their high surface area, ordered structure, and uniform pore size [12]. In general, heterogeneous micrometric size catalysts present low catalytic activity due to slow diffusion of reagents [13]. Therefore, active metal nanoparticles (NPs), which have high catalytic activity due to their high surface-volume ratio and chemical reactivity, have been incorporated into solid supports for increasing their efficiency, recyclability and stability, thus providing more sustainable processes [14][15][16]. When unsupported, the high surface energy of nanocatalysts increases system instability and leads to aggregation, thus resulting in the loss of its catalytic properties. The...

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Section: Adsorption Thermodynamicsmentioning

confidence: 74%

Section: Kinetic Studymentioning

confidence: 76%

Section: Adsorption Thermodynamicsmentioning

confidence: 84%

Section: Kinetic Studymentioning

confidence: 99%

Section: Kinetic Testsmentioning

confidence: 99%

See 3 more Smart Citations

Assessment of Ag Nanoparticles Interaction over Low-Cost Mesoporous Silica in Deep Desulfurization of Diesel

et al. 2019

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Simultaneous Determination of Ranitidine and Metronidazole at Low Potential Using an Acid‐Activated Glassy Carbon Electrode

et al. 2023

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A simple, highly sensitive and inexpensive electrochemical method was established using an activated glassy carbon electrode (AGCE) in an acidic condition for the determination of ranitidine (RT) and metronidazole (MT) simultaneously at a low potential range. The AGCE was characterized using various techniques such as electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV), and morphology was studied through field‐emission scanning electron microscope (FE‐SEM). The AGCE exhibited an electrocatalytic behavior towards the reduction of RT and MT in 0.5 M acidic solution. Both CV and DPV responses for the mixture of RT and MT gave well‐resolved peaks at low potential. Analysis of these experiments helps us to predict interactions that took place on the surface of AGCE and RT and MT with each other for having different types of functional groups. Furthermore, AGCE also promoted the electron transfer process. The linear dynamic range of MT and RT was 0.5–580 μM and 0.5–500 μM, respectively with the regression coefficient 0.99. The detection limit (S/N=3) calculated for MT and RT was 0.062 μM and 0.13 μM, respectively. Decent results were obtained from the reproducibility and stability test. The performance of the sensor was evaluated for the possible interferences which show high selectivity. Additionally, the real sample analysis was carried out to understand our sensor‘s applicability in real life.

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Experimental and theoretical study of adsorptive interactions in diesel fuel desulfurization over Ag/MCM-41 adsorbent

et al. 2019

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Adsorption of metronidazole and spiramycin by an Algerian palygorskite. Effect of modification with tin

Cited by 42 publications

References 48 publications

Assessment of Ag Nanoparticles Interaction over Low-Cost Mesoporous Silica in Deep Desulfurization of Diesel

Assessment of Ag Nanoparticles Interaction over Low-Cost Mesoporous Silica in Deep Desulfurization of Diesel

Simultaneous Determination of Ranitidine and Metronidazole at Low Potential Using an Acid‐Activated Glassy Carbon Electrode

Experimental and theoretical study of adsorptive interactions in diesel fuel desulfurization over Ag/MCM-41 adsorbent

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