Mesoporous NaX zeolites (Meso-NaXs) have been successfully synthesized by a combination of preformed FAU (Faujasite) zeolite precursors and organic templates of cationic polymer (polydiallyldimethylammonium chloride, PDADMAC) and spirulina (SP). Characterization of Meso-NaXs by scanning electron micrographs (SEMs) indicates the existence of mesopores with sizes of 4–50 nm. Furthermore, nitrogen adsorption–desorption isotherms of Meso-NaXs exhibit not only adsorption at low relative pressure (P/P0 < 0.02) but also hysteresis loops at high relative pressure (P/P0 = 0.4–1.0). Additionally, the calcium ion-exchange rate of these mesoporous NaX zeolites is higher than that of conventional NaX zeolite, which would be very helpful for industrial application of NaX zeolite as a highly effective adsorbent and ion-exchanger.

EMT-rich faujasite zeolite has been successfully synthesized from an organic template of low-cost polyquaternium-6 in the absence of crown ether (18-crown-6). Additionally, low-cost water glass is used as a silica source taking the place of silica sol generally used in the conventional synthesis of EMT zeolite. X-ray diffraction (XRD) patterns show that the samples exhibit obvious peaks associated with EMT structure in addition to the peaks assigned to Y zeolite, indicating the presence of EMT and Y phase, and the purity of EMT zeolite reaches 70–80%. Scanning electron micrographs (SEM) show that partial crystals of the sample are typically hexagonal symmetry, confirming the presence of zeolite EMT crystals. Thermogravimetric and differential thermal analysis (TG-DTA) show that there are obvious peaks associated with combustion of organic template, suggesting that polyquaternium-6 plays an important role for the formation of zeolite EMT phase. Furthermore, temperature programmed desorption of ammonia (NH3-TPD) shows that the acidic amount of EMT-rich faujasite is slightly more than that of Y zeolite, and catalytic cracking of cumene shows that EMT-rich faujasite has higher activity than zeolite Y.

Phenoxymethylpenicillin (PMP) has been reversibly intercalated into a layered double 14 hydroxide, and the resulting composite exhibits effective anti-bacterial activity. Powder X-ray diffraction studies indicate that the PMP molecules are interdigitated between the inorganic layers, and under mild acidic media, the molecules are released gradually. Therefore a sustained-release anti-bacterial medication is envisioned on the basis of this inorganic-drug composite. (c) 2005 Society of Chemical Industry.

A new composite compound HT-DNA-ET has been prepared through intercalation of ethidium and DNA molecule into the layers of hydrotalcite (HT). The HT-DNA-ET compound has been investigated by various analytical methods such as X-ray diffraction, IR, UV-vis and circular dichroism spectroscopy, element and thermogravimetric analyses. The interlayer distance of the HT-DNA-ET compound is 4.6 nm, larger than that of the pristine HT. Taking into account the structure of the DNA molecule and the ET molecule, it was proposed that there are two layers of DNA-ET composite between two adjacent HT sheets. The DNA molecules in the HT-DNA-ET compound retain their chemical and biological integrity. The HT-DNA-ET compound gave rise to photoluminescence of λem, max = 610 nm under the excitation of a laser light of λex, = 488 nm.

A novel composite material, α-Zr(HPO4)2·1.5Lysine:0.06Eu3+ (designated ZLE), has been prepared through intercalation of L-lysine (Lys) molecules and Eu3+ ions into between the layers of α-Zr(HPO4)2 (α-ZrP). It is proposed that the ZLE material contains Eu complexes lying between adjacent layers of Lys molecules which are attached on the inner surface of α-ZrP, and the Eu3+ ions are coordinated by carboxyl groups of Lys molecules. The ZLE composite in combination with Al(i-Bu)3 and glycerin has been used as a catalyst for the copolymerization of propylene oxide (PO) and CO2, and the catalytic system exhibits performance superior to the previously reported Y(P204)3-Al(i-Bu)3-glycerin system.

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[C5H5NC16H33][Eu(TTA)4] (TTA: 1-(2-thenoy)-3,3,3-trifluoracetate) is encapsulated in Si-MCM-41 which is modified with (3-chloropropyl)triethoxysilane and (1R,2R)-(−)-1,2-diaminocyclohexane. The XPS and IR spectra prove that the two organic molecules is grafted onto the surface of the channel of Si-MCM-41, UV-visible spectra and XPS of the rare earth (RE) complex and the assembly prove that the RE complex is dispersed in the channels of the chiral Si-MCM-41. Compared with the RE complex itself, the colour purity and the unit-mass luminescent intensity of the assembly are enhanced four times and twelve times, respectively.

The incorporation of the rare-earth complex [C5H5NC16H33][Eu(TTA)4] into surface-modified mesoporous molecular sieve Si−MCM-41 via reactions of the surface Si−OH with different silylation agents such as (C2H5O)3Si(CH2)2NH(CH2)2NH2 (NSED), (C2H5O)3Si(CH2)3NH2 (APTES), and (C2H5O)3Si(CH2)3CN (TSBT) and their photophysical properties were studied. The results show that the surface silylation of Si−MCM-41 provides a unique chemical environment for the incorporated [C5H5NC16H33][Eu(TTA)4] complex. Hydrogen-bonding interactions of the rare-earth complex with its surrounding silylating agents alter the photophysical properties of the rare-earth complex. The emission intensity and color purity of the excited rare-earth complex in these surface-silylated Si−MCM-41 materials increase in the order of Si−MCM-41 < TBST−Si−MCM-41 < APTES−Si−MCM-41 < NSED−Si−MCM-41. Because of the strongest hydrogen bonding in NSED−Si−MCM-41, the rare-earth complex only emits light with a single wavelength, corresponding to 5D0−7F2. Thi...

Hetero-polyacid anions (PW12O40 3− )-pillared hydrotalcite-like compound is directly and hydrothermally synthesized by the hot solution method. FTIR and XRD show that PW12O40 3− has been incorporated into the interstitial space with the dimension of 0.917 nm. The state of PW12O40 3− anion between the hydrotalcite sheets was also discussed. The title product can be expressed by formula (Zn0.68Al0.32(OH)2)⋅(PW12O40) 0.11⋅3H2O after a serious study of TGA and chemical analysis.

Copper titanate, sodium titanoaluminate and sodium titanate molecular sieves were first synthesized hydrothermally with templates TPAOH and TEAOH, Their properties of physical chemistry were studied and their structures were characterized by using the methods of XRD, IR, UV, SEM, DTA, NH3-TPD and gas adsorption. Catalytic activity for copper titanate molecular sieve in which there is a structural unit of four coordinations TiO4 was proved Ly the reaction of hydroxylation of phenol.

The synthesis of zeolite Ti-Fe-ZSM-5 containing double heteroatom with silica sol as Si sources, titanium sulfate and iron trichloride as the starting materials and teterapropy-lammomium bromide, 1,6-dihexamine and n-butylamine as the templates, respectively in the absence of alkali metal ions was investigated in detail. Some physico-chemical properties and the structure of the product were characterized by using techniques of XRD, IR, SEM. Mossbauer, UV-Vis, ESR and TG-DTA. It is proved that the double active centers exist in the product, having a synergistic catalytic oxidative property by the method of GC analysis in a reaction of phenol hydroxylation.

Hydrotalcite [CdxMg6-xAl2(OH)(16)](2+)[S . 2H(2)O](2-)doped with Cu2+ ion was synthesized hydrothermally and the influence of the Cu2+ and Cd2+ ionic content, sulphuration time and calcination temperature on the conductivity was studied, The results show that the conductivity increases with the increases of Cu2+ and Cd2+ content and sulphuration time in the given ranges, and decreases beyond the ranges, The activation energies calculated with equation sigma = sigma(o)exp(-E-a/RT) in the ranges of temperatures from 323 K to 363 K and from 383 K to 523 K are 76.55 kJ/mol and 7.18 kJ/mol, respectively, It is a good protonic conductor in the latter temperature range.

The structure and physico-chemical properties of zeolites TS-1, TS-2, Ti-ZSM-48, sodium titanate, copper titanate and sodium titanoaluminate were studied by using the methods of XRD, IR, UV-VIS, DTA, NH 3-TPD. It was proved that the zeolites in which having the structural unit of four coordination TiO 4 show catalytic activity for the reaction of phenol hydroxylation. Influence of experimental conditions on the reaction of hydroxylation were also investigated in detail.