Kinetics and thermodynamics of methylene blue adsorption on the Fe-oxide nanoparticles embedded in the mesoporous SiO2

Solution NMR methods for structural and thermodynamic investigation of nanoparticle adsorption equilibria

“…UV/Vis is a sensitive and cost-effective spectroscopic method for the detection and characterization of diverse analytes, ranging from small molecules 7–10 to large biopolymers. 11,12 The UV/Vis adsorption wavelength of an analyte is highly sensitive to the immediate environment, and thus, different UV/Vis absorption maxima are expected for an adsorbed ligand and for the same molecule in the bulk solution.…”

“…The q LS value can be derived indirectly by subtracting C L from L, and the obtained data can be t using the Langmuir adsorption model (eqn ( 5)-( 8)) to yield the kinetics and thermodynamics of sorption. Employment of UV/Vis spectroscopy in this manner was reported for a few protein-NP and small molecule-NP systems, where the equilibrium association constant [37][38][39][40][41] or a range of kinetic and thermodynamic parameters 9,10,[40][41][42][43][44][45][46][47] were determined.…”

“…Nanoparticle (NP) catalysts have found many applications in numerous elds such as energy, 1,2 petrochemical, 3,4 and medicine, 5,6 due to their high surface-area-to-volume ratio and sizedependent properties that make them highly efficient and tunable catalysts. Since sorption equilibria play an essential role in determining the efficiency and selectivity of NP catalysis, many analytical techniques have been utilized to characterize ligand-NP surface interactions, including ultraviolet-visible (UV/Vis) spectroscopy, [7][8][9][10] uorescence, 11,12 vibrational spectroscopy, [11][12][13] and isothermal titration calorimetry (ITC). 14 However, the outcomes of these analytical methods are generally dependent on the specic system under investigation and experimental conditions.…”

Template-free synthesis of hybrid silica nanoparticle with functionalized mesostructure for efficient methylene blue removal

“…Removing these pollutants from water by adsorption is a viable and safer option of pollution control, unlike oxidation or degradation methods, where degradation product of these dyes can lead to secondary pollution. Thus, several adsorbents have been designed for efficient removal of the MB and similar cationic pollutants [2][3][4][5][6][7][8][9]. The use of functionalized hydrogels [3,4], carbon-based adsorbents [5], and mesoporous silica nanoparticles (MSNs) [6,7,10] are extensively investigated because of their high adsorption capacity.…”

“…Thus, several adsorbents have been designed for efficient removal of the MB and similar cationic pollutants [2][3][4][5][6][7][8][9]. The use of functionalized hydrogels [3,4], carbon-based adsorbents [5], and mesoporous silica nanoparticles (MSNs) [6,7,10] are extensively investigated because of their high adsorption capacity. Recently adsorbents designed from agricultural wastes have gained interest due to their low cost, although their low adsorption capacity makes them unattractive for commercial exploitation [11,12].…”