Preparation of organoclay having titania nano-crystals in interlayer hydrophobic field and its characterization

Abstract

To prepare the material for cleaning up the water polluted by the toxic organic compounds with poor polarity such the endocrine disruptor chemicals, we attempted to prepare the cation-exchangeable titania-pillared clay by the hydrothermal synthesis. White powder obtained by the hydrothermal treatment of the montmorillonite with titania precursor in water still had the cation-exchangeable property. Both TEM image and XRD patterns showed that anatase-type nano-crystals (crystalline size: ca. 20 nm) were incorporated in the montmorillonite interlayer space. The organoclay having titania nano-crystals (OCT) could be prepare by intercalating the cetyltrimentylammonium cations to the montmorillonite with titania nano-crystals (CT) due to the cation-exchange reaction. The adsorption amount of bisphenol A (BPA) by the OCT from water was about 6th times larger than that by the CT, because the OCT has higher hydrophobicity than CT. From UV irradiation experiment by 300 W highpressure Hg lamp, it was found that OCT exhibited the higher photocatalytic decomposition ability for BPA dissolved in water than both CT and titania nano-crystal powder, which was synthesized under the hydrothermal condition. Moreover, the present OCT exhibited the high durability against the continuous UV irradiation.

Preparation and Characterization of Rhodamine 6G/Alkyltrimethylammonium/Laponite Hybrid Solid Materials with Higher Emission Quantum Yield

“…Moreover, it is also well-known that the intercalated molecules form an ordered structure in the 2D interlayer nanospace spontaneously; that is, this indicates that solid materials with unique functions, such as anisotropic, nonlinear, and nonequilibrium properties, can be easily prepared. Considering these useful characteristics, many researchers have studied the hybridization of various functional organic compounds with ion-exchangeable layered clay and those various characterizations. − ,− Additionally, clay has no absorption band in the visible range, and many researchers have also studied the incorporation of various photofuntional organic compounds in the interlayer nanospace. Thus, the hybridization of laser−dye molecules with various clays such as laponite, montmorillonite, saponite, and so on, has been investigated by many researchers. − ,− ,− Such hybridization systems of laser−dye and clay are very effective for clarifying the basic principles for function/structural control of the organic/clay hybrid materials such as the adsorption state/behavior of laser−dye, the steric/electronic interaction between laser−dye and clay, and so on.…”

“…Considering these useful characteristics, many researchers have studied the hybridization of various functional organic compounds with ion-exchangeable layered clay and those various characterizations. − ,− Additionally, clay has no absorption band in the visible range, and many researchers have also studied the incorporation of various photofuntional organic compounds in the interlayer nanospace. Thus, the hybridization of laser−dye molecules with various clays such as laponite, montmorillonite, saponite, and so on, has been investigated by many researchers. − ,− ,− Such hybridization systems of laser−dye and clay are very effective for clarifying the basic principles for function/structural control of the organic/clay hybrid materials such as the adsorption state/behavior of laser−dye, the steric/electronic interaction between laser−dye and clay, and so on. From the point of view of the optical function of laser−dye/clay nanohybrid solid materials, these hybrid materials can make it possible to convert the lasing medium of dye−laser oscillator from liquid to solid.…”

“…Thus, the hybridization of laser-dye molecules with various clays such as laponite, montmorillonite, saponite, and so on, has been investigated by many researchers. [19][20][21][22][23][24][25][26][27][28][29][30][31][32][40][41][42][43][44][45][46][47][48][49][50][51][52][53][54][55][56][59][60][61][62][63] Such hybridization systems of laser-dye and clay are very effective for clarifying the basic principles for function/structural control of the organic/clay hybrid materials such as the adsorption state/behavior of laser-dye, the steric/ electronic interaction between laser-dye and clay, and so on. From the point of view of the optical function of laser-dye/ clay nanohybrid solid materials, these hybrid materials can make it possible to convert the lasing medium of dye-laser oscillator from liquid to solid.…”

Eosin Removal by Cetyl Trimethylammonium-Cloisites: Influence of the Surfactant Solution Type and Regeneration Properties

“…The CHN elemental provides an estimation of the uptake of organic cations in the prepared organoclays [33,53,54,55,56,57]. The data are summarized in Table 1.…”

Ultra-Sensitive Detection of Pyridine in Water Using Zinc Porphyrin Incorporated in a Transparent Hydrophobic Film

“…In this context, we have previously developed functional materials by hybridizing functional molecules, such as dyes, with ion-exchangeable layered inorganic compounds modified with amphipathic molecules. [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] More specifically, an R6G/C16TMA/Lap hybrid material comprising rhodamine 6G (R6G) and laponite clay (Lap) modified by the hexadecyltrimethylammonium (C16TMA) cation, retained the luminous properties of R6G under both dry and wet conditions. 6 Through the use of hexyltrimethylammonium (C6TMA) cations with shorter alkyl chains instead of C16TMA, the luminous properties of R6G in the R6G/C6TMA/Lap hybrid material varied under dry and wet conditions.…”