Bisphosphonate modified mesoporous silicon for scandium adsorption
Rinez ThapaTuomo NissinenPetri TurhanenJuha A. E. MäättäJouko VepsälainenVesa‐Pekka LehtoJoakim Riikonen
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Keywords:
Scandium
Hybrid material
MCM-41
Abstract An efficient method for mesoporous molecular sieve MCM-41 was introduced in this report. In EDA/TEOS/CTAB/glycerol system, mesoporous molecular sieve MCM-41 has been synthesized at room temperature and under hydrothermal condition, respectively, characterized by X-ray power diffraction and N 2 adsorption. Compared with the samples synthesized under hydrothermal condition, the samples synthesized at room temperature have better order, larger pore diameter and narrower pore diameter distribution.
MCM-41
Hydrothermal Synthesis
Mesoporous organosilica
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MCM-41
ZSM-5
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In this work,the influence of different immobilization conditions on the enzyme activity and the enzyme activity yield with sodium MCM-41 and hydrogen MCM-41 mesoporous materials were studied.The results showed that higher enzyme activity and enzyme activity yield was obtained by using hydrogen MCM-41 mesoporous materials as the carrier under different immobilized conditions.These suggest that hydrogen MCM41 mesoporous materials had better immobilized effect than sodium MCM-41 mesoporous materials.
MCM-41
Mesoporous organosilica
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MCM-41
Mesoporous organosilica
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MCM-41
Mesoporous organosilica
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The Al/SO2-4/MCM-41 were prepared by modifying MCM-41 with Al2(SO4)3.The structures and surface acidity of Al/SO2-4/MCM-41 were characterized by X-ray diffraction(XRD),Fourier transform infrared spectroscopy(FT-IR),N2 adsorption-desorption and NH3 temperature programmed desorption(NH3-TPD).The results showed that the mesoporous molecular sieves Al/SO2-4/MCM-41 keeping up their hexagonal mesoporous structure can be obtained by modifying MCM-41 with Al2(SO4)3.
MCM-41
Thermal desorption spectroscopy
Characterization
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MCM-41
Nanoporous
Characterization
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Using Cetyltrimethyl ammonium bromide(CTAB) as the template,tetraethyl orthosilicate(TEOS) as the source of silicon,the hexagonal ordered mesoporous materials MCM-41 was prepared at room temperature.The MCM-41 was chemical modified by TMB and APTES,and then the modified MCM-41 was acquired.The structure of the samples were characterized by X-ray Diffraction,Infrared spectroscopy and Nitrogen adsorption-desorption methods.The results indi-cated that the modified MCM-41 remains the hexagonal ordered mesoporous structure.The product gets a larger pore diam-eter than the pure MCM-41 when expanded by TMB,reduced the surface silanols by the silane modification,and incre-ased the surface polarity of MCM-41,then it is advantageous for the assembly of the mesoporous material MCM-41.
MCM-41
Ammonium bromide
Mesoporous organosilica
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Modification of mesoporous molecular sieve MCM-41 with dimethyl dichlorosilane(DMCS) methyl is successfully grafted into the surface of MCM-41 mesoporous sieve.The organic-inorganic complex material CH_3-MCM-41 is synthesized, and its structure is characterized by elemental analysis and FT-IR.
MCM-41
Dichlorosilane
Sieve (category theory)
Surface Modification
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A novel hybrid inorganic-organic mesoporous luminescent material (phen) 2Eu/MCM-41 has been synthesized and characterized by XRD, IR, fluorescence and diffuse reflection spectra. In comparison with MCM-41, the hybrid mesoporous material has typical structure of MCM-41 and retains the same pore structure as MCM-41 after the assembly process. The hybrid mesoporous material shows characteristic emission spectra of Eu 3+ under UV irradiation, but the excitation spectrum has shifted to blue region compared to that of pure rare earth complex. The decrease of site symmetry of Eu 3+ has been found. The fluorescence lifetime of (phen) 2Eu/MCM-41 is longer than that of pure rare earth complex. The spectra of hybrid mesoporous material have been discussed.
Hybrid material
MCM-41
Characterization
Mesoporous organosilica
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