Adsorptive removal of dihydrogenphosphate ion from aqueous solutions using mono, di- and tri-ammonium-functionalized SBA-15

Hamoudi, Safia; El-Nemr, Abir; Belkacemi, Khaled

doi:10.1016/j.jcis.2009.11.070

Cited by 45 publications

(19 citation statements)

References 43 publications

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“…The equilibrium model parameters are provided in Table 4. From the Langmuir model, Table 3 Kinetic model parameters obtained from model fitting to experimental data Mesoporous silica Dye Pseudo-first-order model Pseudo-second-order model Elovich model [6,22,25,29]. Additionally, the value of Q m for AB25 in f-MCM-41 was 45.9 mg g −1 , which was similar to or lower than other reported values (55.4 and 145 mg g −1 ) of functionalized mesoporous silica for AB [30,31].…”

Section: Kinetics Equilibrium Isotherms and Thermodynamic Analysessupporting

confidence: 66%

“…The negative values of ΔH˚repre-sent the exothermic nature of MB adsorption to MCM-41 and AB25 adsorption to f-MCM-41, indicating that adsorption capacity decreases with increasing temperature. The negative values of ΔS˚indicate that energy is released during the sorption process and randomness decreases at the interface between solid and solution [22]. In addition, the positive values of ΔG˚were obtained for MB adsorption to MCM-41 and AB25 adsorption to f-MCM-41 (Table 5).…”

Section: Kinetics Equilibrium Isotherms and Thermodynamic Analysesmentioning

confidence: 87%

“…The XRD pattern of f-MCM-41 demonstrates that the main peak signal of MCM-41 existed in f-MCM-41. The shift of (100) diffraction peak to the right in f-MCM-41 could be attributed to the decrease of pore size as a result of amine groups anchoring on the mesopores of MCM-41 [22]. In the FTIR spectra of MCM-41 ( Fig.…”

Section: Characteristics Of Mcm-41 and F-mcm-41mentioning

confidence: 95%

“…3(b). The XRD pattern of MCM-41 indicates two peaks at 2θ = 2.44 and 4.18, and these peaks were indexed to (100) and (110) reflections, respectively, a characteristic of hexagonal mesostructures [22]. The XRD pattern of f-MCM-41 demonstrates that the main peak signal of MCM-41 existed in f-MCM-41.…”

Section: Characteristics Of Mcm-41 and F-mcm-41mentioning

confidence: 96%

“…Conversely, the adsorption of AB25 to f-MCM-41 was favorable, whereas the adsorption of MB to f-MCM-41 was not. These phenomena could be attributed to the fact that MB is a cationic dye, and so, the adsorption of positively charged MB to negatively charged MCM-41 was favorable under the experimental conditions (pH 6.0) due to electrostatic attraction [22,24]. The pH pzc of MCM-41 was determined to be 4.0, above which the Our results conform well to the reports of other researchers who demonstrated that negatively charged mesoporous silica was effective in the removal of cationic MB.…”

Section: Mesoporous Silicamentioning

confidence: 97%

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Surface functionalization of mesoporous silica MCM-41 with 3-aminopropyltrimethoxysilane for dye removal: kinetic, equilibrium, and thermodynamic studies

Kang

Park

Kim

et al. 2016

Desalination and Water Treatment

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2015): Surface functionalization of mesoporous silica MCM-41 with 3-aminopropyltrimethoxysilane for dye removal: kinetic, equilibrium, and thermodynamic studies, Desalination and Water Treatment, A B S T R A C TMesoporous silica MCM-41 was synthesized and functionalized with a silane coupling agent (3-aminopropyltrimethoxysilane, APTMS) for the removal of Acid Blue 25 (AB25, anionic dye) and Methylene Blue (MB, cationic dye) from aqueous solutions as adsorbents. The synthesized (MCM-41) and functionalized (f-MCM-41) materials were characterized using field emission scanning electron microscopy, energy-dispersive X-ray spectrometry, transmission electron microscopy, particle size analysis, nitrogen gas adsorption-desorption analysis, X-ray diffraction spectrometry, and Fourier transform infrared spectrometry. The results indicate that the surface modification of MCM-41 with APTMS was successfully carried out. Batch experiments were performed to examine AB25 and MB removal by MCM-41 and f-MCM-41 under various experimental conditions. The results show that f-MCM-41 was a good adsorbent for anionic AB25, but not for cationic MB. This could be attributed to the presence of amine groups on the surfaces of f-MCM-41 from the APTMS modification. Conversely, MCM-41 was good for MB removal, but not for AB25 removal. AB25 removal in f-MCM-41 was sensitive to solution pH, with decreasing adsorption capacity as pH increased from 4.1 to 9.4. MB removal in MCM-41 was sensitive to solution pH in the opposite manner, with increasing adsorption capacity as pH increased from 4.1 to 10.3. Thermodynamic analysis showed that the adsorption of AB25 to f-MCM-41 and of MB to MCM-41 decreased with increasing temperature from 15 to 45˚C, indicating the exothermic nature of the sorption process. This study demonstrated that surface functionalization with silane coupling agents can help to make MCM-41 useful for the removal of various types of dyes.

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