Assembly Of A?-Conjugated Organic Molecule-BDOBC16, In Silylated SBA-15 And Fabrication Of Micropores In SBA-15

In this paper, the first system is about fluorescence compounds and we utilized SBA-15 modified with ?- aminopropyl triethoxysilane (APTES) as the host to assemble 4,40-(9-(n-Hexadecyl)carbazole-3,6-diyl)di(6-(4-(diphenylamino)phenyl)-2,2-difluoro-1,3,2(2H)-diox-aborine) (named as BDOBC16), a kind of ?-conjugated organic molecule containing P-diketone-boron difluoride groups. Using analysis technics of 400MHz 29SiNMR and BET, we found a significantly quantitive reducing about hydro xyl group of SBA-15's hole walls after alkylation, and analysis their pore size distribution data also found that SBA-15's pore size reduced from the initial 7.9 nm to 6.5 nm(after modification), then to the final 4.9 nm(after assembly). In the FT-IR spectroscopy, compared to silylated SBA-15, absorption of N-H in the assembly has 8 cm-1 blue shift (from 3507 to 3515 cm-1), the absorptions of B-F bond in BDOBC16 and assembly are at 1161 cm-1 and 1135 cm-1, respectively, there is 26 cm-1 red shift happens, indicating silane modification and assembly been successful. And TG-DTA data showed that the quality ratio of BDOBC16 in the entire assembly is about 15.5%, and decomposition temperature of BDOBC16 also increased. Results on fluorescence properties of two compounds indicated that the organic compound in silylated SBA-15 emits green light while itself emits red light,0.45 eV energy is found changeable in emission of the guest before and after assembly, and luminescent intensity of BDOBC16 increases 75 times after it was assembled. Strong H-bonds is found existing between the host and guest, which is regarded as the main reason to result tremendous change in luminescence of the guest. Molecular aggregation is also found harmful while high dispersion is benefit on luminescence of the guest.The second system is about hierarchical porous materials and the microporous structure was fabricated based on SBA-15 by silane modification and hydrolysis, synthesis a kind of hybrid porous materials HSSBA-15 named. The reaction processes didn't destroy the original skeleton of SBA-15, just freshly prepared micropores in the mesopores, due to low crystallinity of the fresh porous it not showing peaks on the XRD pattern. Two kinds of pores with 6.5 nm(mother pores) and 1.9 nm (fresh pores) in diameter are found in the hybrid material HSSBA-15. Compared to the original SBA-15, surface area of the hybrid porous material increases from 395.9 to 667.4 m2/g while the porous volume decreased 0.0214 cm3/g. We can see HRTEM images and found the original mesopores to appear blurred outline of some of the channels than original SBA-15. The hybrid material combines the properties of microporous and mesoporous components, and its superiority of the combination can be fully manifested by strong adsorption properties. Application of this hybrid material-HSSBA-15 for purification of sea water, its adsorbing effect for Na+ and Cl- was studied by kinetics and thermodynamics methods, and we found that the effects of different initial adsorbate concentrations, adsorption temperatures and times are different clearly. Combining the three impact factors, we found the best adsorption effect. Comparing a low concentration of NaCl, HSSBA-15 has stronger adsorption capacity to high concentrations of NaCl within a certain range. Adsorption of Na+ and Cl- because SBA-15 contain OH which full of electrons and electrostatic interaction exist between the electrons and Na+, Na+ and Cl-, so alternate positive and negative particles and Na+ and Cl- can be adsorbed together. Adsorption curves tells us that the adsorption amount (qe) increase sharply in the initial period of time, but basically stabilized after 10 hours,48 hours is found to be adsorption equilibrium time; the higher the initial concentration of NaCl, the greater the amount of adsorption in a certain range, then the adsorption amount will not increase following initial concentration of NaCl; 20? is the optimum adsorption temperature, below or above 20 ? the adsorption amount both reducing, especially high temperatures, and drastic thermal motion of molecules by high temperature lead to Na+ and Cl- easier to back to the solution, due to the energy of thermal motion of molecules higher than the electrostatic force. Integrated results show that the optimum condations is initial concentration of NaCl 5 g/L,20? and 48 hours reaching adsorption equilibrium, the maximum adsorption capacity for the adsorbent HSSBA-15 is about 517.5 mg/L, SBA-15 being 133.4 mg/L, only 25.8% of HSSBA-15.