Zeolite hybrid films for space decontamination

Synthesis of mono- and bi-layer MFI zeolite films on macroporous alumina tubular supports: Application to nanofiltration

“…The coated alumina tube with a monolayer of ZSM-5 zeolite film (MFI structure type) was placed for 1 hour in a cationic polymer solution (poly(diallyldimethylammonium) chloride 1 wt % aqueous solution, Aldrich) to reverse the negative charge of the MFI layer surface (by dip coating) [8,9,49] section. After the hydrothermal step, the substrates were rinsed abundantly with distilled water, placed in an ultrasonic bath for a few minutes to remove the loosely attached crystals and dried at 70 °C.…”

“…Zeolites have an important role in addressing some of the major problems facing society in the twenty-first century, such as energy storage, water and air decontamination, therapeutics (drug delivery,...) and catalysis [1][2][3][4][5][6][7][8][9][10][11]. Due to these manifold applications of crystalline zeolites, increasing attention worldwide has been paid to the preparation of zeolites in forms suitable for practical utilization and to the development of methods for producing zeolite objects (films, membranes, pellets, microspheres,...) with controllable thickness.…”

“…For example, high-silica zeolites (HSZ) are used for their sorption properties or good corrosion resistance while complementary sorption or antimicrobial properties of low-silica zeolite (LSZ) such as Y zeolite (FAU) [47] or modified zeolite A (LTA) [48] are exploited. Indeed, the combination of several zeolite layers in the same film raises more and more interest for the volatile organic compound (VOC) removal and the pollutants adsorption, including on-orbit decontamination [7][8][9]49]. Different aims are followed when synthesizing multi-layer zeolite membranes: 1) improved separation selectivity by repeated crystallizations of the same zeolite, 2) novel properties by combination of layers of different zeolite types [8,9,42,43,49].…”

“…Indeed, the combination of several zeolite layers in the same film raises more and more interest for the volatile organic compound (VOC) removal and the pollutants adsorption, including on-orbit decontamination [7][8][9]49]. Different aims are followed when synthesizing multi-layer zeolite membranes: 1) improved separation selectivity by repeated crystallizations of the same zeolite, 2) novel properties by combination of layers of different zeolite types [8,9,42,43,49]. Recently, Wang et al [50] and Dong et al [51] prepared a flat and a tubular asymmetric bilayer MFI membrane respectively, used as WGS membrane reactors.…”

Mechanical properties of electrochemically synthesised metal–organic framework thin films

“…The elastic recovery of Cu(CHDA) is comparable with that of organic polymers and nanocomposites (60-80%), 44,45 while Cu(INA) 2 has a similar value as a scratched zeolite MFI lm (37%). 46 In order to further analyse the possible loss of mechanical integrity of the MOF lms, scratches were evaluated by SEM. By studying the formation of pile-ups, cracks and possible delamination, more insight into the plastic deformation can be gained.…”