Mesoporous organosilica membranes: Effects of pore geometry and calcination conditions on the membrane distillation performance for desalination

Chua, Yen Thien; Lin, Chun Xiang; Kleitz, Freddy; Smart, Simon

doi:10.1016/j.desal.2015.05.015

Cited by 21 publications

(4 citation statements)

References 47 publications

(51 reference statements)

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“…These water fluxes were very low, and many of the recent performance improvements of silica based membranes were realized by the formation of mesoporous structures. This has been achieved by using triblock copolymer Pluronic F127 [22] or F68 templates or [23], or co-assembling Pluronic F68 template with organo-bridged silica precursors such as 1, 2-bis (triethoxysilyl) ethane (BTESE) [19]. Mesoporous structures allow for an increase in the total pore volume through the membrane matrix, thus reducing resistance to the diffusion of water vapors and increasing water fluxes.…”

Section: Membranementioning

confidence: 99%

Interlayer-free hybrid carbon-silica membranes for processing brackish to brine salt solutions by pervaporation

Yang

Elma

Wang³

et al. 2017

Journal of Membrane Science

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Mesoporous, interlayer-free, hybrid carbon-silica matrices and membranes based on tetraethoxysilane (TEOS), organosilica of triethoxyvinylsilane (TEVS) and pluronic triblock copolymer poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) (P123) were successfully prepared using an acid-base catalysed sol-gel method for desalination applications. These membranes were carbonized to form the hybrid carbon-silica structures under inert conditions in vacuum and nitrogen. The effects of calcination conditions on the structure-property relationship of the carbon-silica xerogels were elucidated, and the membrane performances were systematically studied using brackish (1 wt%) to brine (15 wt %) feed concentrations of sodium chloride solution and feed temperatures (25-60 °C) under pervaporation process. Vacuum calcined (CS-Vc) membrane produced a slightly more mesoporous matrix and higher carbon yield than the nitrogen calcined (CS-N 2) membrane, and hence, led to comparatively superior desalination performance. CS-Vc membranes produced high water fluxes of 26.5 (1 wt%, 60 °C) and 9.2 (15 wt%, 60 °C) L m-2 h-1 with salt rejections of 99.5% and 98.6%, respectively. This study demonstrates that the combined strategy of hybrid organosilica with polymeric template and 2 vacuum calcination offered the carbonized silica mesostructure membranes with excellent separation of water from the hydrated salt ions, and importantly, high water fluxes particularly for processing brine salt solutions.

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Section: Membranementioning

confidence: 99%

Interlayer-free hybrid carbon-silica membranes for processing brackish to brine salt solutions by pervaporation

Yang

Elma

Wang³

et al. 2017

Journal of Membrane Science

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“…Chua et al [ 19 ] reported that hybrid membrane was prepared under a two-step catalyst using HCl as an acid catalyst, BTESE as a precursor and carbon as a surfactant. Its membrane has a high surface area BET, pore volume and pore size of 310 m 2 g −1 , 0.18 cm 3 g −1 and 2 nm, respectively.…”

Section: Introductionmentioning

confidence: 99%

Physicochemical Properties of Mesoporous Organo-Silica Xerogels Fabricated through Organo Catalyst

et al. 2021

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The physicochemical properties of organo-silica xerogels derived from organo catalyst were pervasively investigated, including the effect of one-step catalyst (citric acid) and two-step catalyst (acid-base), and also to observe the effect of sol pH of organo-silica xerogel toward the structure and deconvolution characteristic. The organo-silica xerogels were characterized by FTIR, TGA and nitrogen sorption to obtain the physicochemical properties. The silica sol–gel method was applied to processed materials by employing TEOS (tetraethyl orthosilicate) as the main precursor. The final molar ratio of organo-silica was 1:38:x:y:5 (TEOS:ethanol: citric acid: NH3:H2O) where x is citric acid concentration (0.1–10 × 10−2 M) and y is ammonia concentration (0 to 3 × 10−3 M). FTIR spectra shows that the one-step catalyst xerogel using citric acid was handing over the higher Si-O-Si concentration as well as Si-C bonding than the dual catalyst xerogels with the presence of a base catalyst. The results exhibited that the highest relative area ratio of silanol/siloxane were 0.2972 and 0.1262 for organo catalyst loading at pH 6 and 6.5 of organo-silica sols, respectively. On the other hand, the organo-silica matrices in this work showed high surface area 546 m2 g−1 pH 6.5 (0.07 × 10−2 N citric acid) with pore size ~2.9 nm. It is concluded that the xerogels have mesoporous structures, which are effective for further application to separate NaCl in water desalination.

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“…Alternatively, more energysaving muffle furnaces can be employed, but they have a much higher cost. Additionally, heat is not a selective stimulus, making the preparation of mesoporous ordered organosilica challenging [9,10]. Therefore, in most applications where a hybrid mesostructure is needed, grafting of organic moieties is performed by post-functionalization of preformed mesoporous inorganic materials [2].…”

Section: Introductionmentioning

confidence: 99%

Scaling-up of mesoporous silica films via an eco-efficient UV processing method. Part 2: Photoinduced calcination

Sibeaud

Croutxé‐Barghorn

Rigolet

et al. 2018

Microporous and Mesoporous Materials

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We describe a fast photocalcination process to prepare highly ordered silica mesoporous films through the use of a low-pressure amalgam arc (λ: 185 / 254 nm). Because radiant power is 2-3 times higher than conventional low-pressure UV lamps, the elimination of the PEO-b-PPO-b-PEO copolymer template in the 2D hexagonal hybrid film has been completed within 50 min, without damage to the mesostructure. The degradation kinetics are impacted by film thickness and irradiance, but hardly copolymer concentration. Compared to thermocalcination, a narrower pore size distribution and lower energy consumption have been found. Photodegradation mostly originates from a photoablation mechanism induced by radiation at 185 nm, while oxidation due to photogenerated reactive oxygen species plays a minor role. Photocalcination has been combined with an initial photoinduced mesostructuration (detailed in Part 1: Microporous Mesoporous Mater., 257 (2017) 42-50), resulting in an unprecedented "all UV" method to mesoporous silica films. The final process relies on dual wavelength photoactivation: UV B to form the hybrid copolymer/silica network, a flash intermediate thermal consolidation, and UV C to decompose the copolymer chains.

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Mesoporous organosilica membranes: Effects of pore geometry and calcination conditions on the membrane distillation performance for desalination

Cited by 21 publications

References 47 publications

Interlayer-free hybrid carbon-silica membranes for processing brackish to brine salt solutions by pervaporation

Interlayer-free hybrid carbon-silica membranes for processing brackish to brine salt solutions by pervaporation

Physicochemical Properties of Mesoporous Organo-Silica Xerogels Fabricated through Organo Catalyst

Scaling-up of mesoporous silica films via an eco-efficient UV processing method. Part 2: Photoinduced calcination

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